FAQ

CHNV lubricant uses a two-in-one lubrication-plus-compatibilization formula, so no extra coupling agent is needed. It thoroughly wets and disperses the wood flour, strengthens the wood-flour/plastic interfacial bond, eliminates voids, delamination and pitting, and raises the board's impact strength.

CHNV WPC lubricant balances internal and external lubrication with a wide processing window, adapting well to all kinds of aging domestic extruders. Screw torque is more stable, die build-up slows dramatically, cleaning frequency is roughly halved, and downtime losses are reduced.

We do not recommend mixing. CHNV offers separate PE-dedicated and PVC-dedicated lubricants: the PE grade suits outdoor decking and railings, while the PVC grade suits foamed wall panels and indoor profiles. Using the right grade avoids lubrication imbalance and board yellowing.

CHNV supplies the Southeast Asian market directly from its own overseas production base, eliminating extra coupling-agent purchasing costs and lowering total additive cost. The product is designed for the region's high heat, humidity and salt spray, resisting heat, moisture and bloom, and comes with complete customs and testing documentation.

Simply choose CHNV's general-purpose weather-resistant PE compound lubricant. One additive system covers both sheltered indoor products and open-air outdoor boards, so switching later needs no reformulation, cutting formula-tuning costs.

It can be used with an external stabilizer, but pairing CHNV lubricant with our matching calcium-zinc stabilizer system gives the best compatibility, with no additive antagonism, effectively avoiding zinc burning, color deviation and accelerated aging.

The full lubricant range comes with RoHS, REACH and food-contact safety test reports, meeting compliance for typical outdoor building-material exports. For especially strict export standards, we can provide custom grades and dedicated test documentation.

CHNV's compound lubricant replaces two traditional raw materials (lubricant plus coupling agent) in a single product, reducing the number of additives to purchase and the dosing steps, streamlining the shop-floor batching process and saving both labor and warehousing costs.

CHNV lubricant tightens the bond between bamboo flour and resin, shrinks tiny internal gaps, lowers the board's water absorption, and reduces moisture ingress that breeds mold, with standout results in the rainy, humid climates of southern regions.

CHNV's low-migration calcium stearate series has extremely low molecular mobility and resists volatilization and bloom at high temperature, effectively controlling interior bloom and windshield fogging, with all indicators meeting whole-vehicle VOC test standards.

Calcium stearate improves the dispersion uniformity of glass fiber and powder fillers and enhances melt flow, so large parts mold out full and smooth. Combined with zinc stearate for stronger release, it reduces mold carbon build-up and lowers rework and scrap losses.

CHNV zinc stearate offers excellent release performance suited to thermoset compression molding, so parts release easily from the mold, reducing housing scratches and breakage and lowering downstream polishing and repair labor.

High-purity zinc stearate acts as a vulcanization activator that promotes full rubber crosslinking, improving elasticity and wear resistance. It disperses evenly during mixing and does not bloom in long-term heat and humidity, extending the service life of rubber parts.

CHNV stearates use a dust-free micro-bead granulation process with very low dust and uniform granules, giving stable automated dosing, a cleaner workshop environment, and compatibility with fully automated lines.

CHNV calcium stearate provides long-lasting thermal stability, neutralizing acidic impurities in the resin and withstanding 105°C for the long term. It resists scorching during processing, so the harness sheathing is less prone to yellowing and cracking over its service life.

CHNV zinc stearate has outstanding dispersing power that fully breaks up pigment powder, giving evenly colored masterbatch and installed parts free of color spots and deviation. For light-colored products, it can be compounded with calcium stearate.

CHNV produces stearates across the full industry chain, benchmarking high-end imported additives at a lower overall purchasing cost. We support small-batch sampling and provide complete automotive-industry environmental test reports, enabling low-cost domestic substitution.

The products carry a full set of SGS, RoHS 2.0 and automotive fogging test reports, meeting the environmental access requirements of major OEMs, and can be used directly in interior/exterior trim and new-energy component production.

They should not be freely mixed. For low-fogging interior products we recommend a specific calcium-zinc ratio; for rubber vulcanization, zinc stearate is the main component. We can provide a dedicated, standardized formulation plan based on your specific product.

Zinc stearate is a metallic stearate with CAS No. 557-05-1 and the formula Zn(C17H35COO)2. It is commonly supplied as a white powder, and can also be designed as a water-based grade or an emulsion depending on the application. In polymer processing it is not limited to a single function: depending on the resin system and formulation it can provide lubrication, dispersion, mold release, anti-blocking and co-stabilization. In PVC it can participate in stabilization and lubrication; in PE, PS, EVA, masterbatch and composites it supports processing lubrication and dispersion; in coatings the focus is more on dispersion, clarity, anti-settling, matting and sanding performance. Therefore "zinc stearate" is only a chemical name — selection should also consider product form, zinc content, free acid, volatiles, melting point, particle size, bulk density and the specific application.

CHNV offers a range of zinc stearate systems rather than a single grade, covering regular powder, ultrafine powder, coatings grades, water-based zinc stearate and zinc stearate emulsions. The petrochemical and plastics powder series includes 15 grades: AV300, AV301, AV302, AV310, AV332, AV350, AV350S, AV301W, AV301S, AV302S, AV302SF, AV320, AV321, SAV250 and SAV350, which differ in free acid, fineness, bulk density, product form and recommended applications. Coatings grades include TV-P, TP200, STP150 and STP250; TP800 is a water-based zinc stearate; and HS2000, HS2030, HS2040 and HS2050 are zinc stearate emulsions. For purchasing, it is better to share the application system, processing method and key specifications of the current product instead of only asking for a price.

SAV250 and SAV350 are both ultrafine zinc stearate grades from CHNV, and one core difference is particle size. SAV250 is controlled at 500 mesh with a sieve pass rate of ≥99.5%; SAV350 is controlled at 425 mesh with a sieve pass rate of ≥99.5%. Both have a zinc content of 10.4%–11.3%, free acid ≤0.5%, volatiles at 105°C ≤0.5% and a melting point of 117–125°C. The main difference is therefore not the basic chemistry but the particle size level and its processing suitability. Finer particles generally help dispersion in resins, pigments or fillers, but 500 mesh is not automatically better for every formulation — equipment shear, dust control, feeding method, surface requirements and cost all matter. For customers replacing imported ultrafine grades, comparing particle size, zinc content, free acid and bulk density first, followed by formulation testing, is more reliable.

The core difference between regular and ultrafine powder is particle size and particle size distribution, not simply a quality level. If zinc stearate mainly provides general lubrication, mold release or stabilization, a regular fineness grade is often sufficient. If the system has higher requirements for pigment or filler dispersion, surface uniformity and fine particle control, ultrafine grades such as SAV250 and SAV350 can be evaluated. Ultrafine products also bring a larger specific surface area and different powder flow, feeding and dust characteristics, so selection should consider the overall processing performance rather than following "the finer the better".

CHNV offers four zinc stearate grades for coatings: TV-P, TP200, STP150 and STP250. All four have a zinc content of 10.3%–11.3%, volatiles at 105°C ≤0.5% and a melting point of 115–125°C. Free acid differs: TV-P ≤0.8%, TP200 ≤0.5%, and STP150 and STP250 ≤0.6%. These grades can be used in super-clear primers, conventional primers and inks. Selection should not rely on free acid alone — clarity, dispersion, anti-settling, matting, sanding, film feel and compatibility with the resin system should also be tested. For applications such as clear wood coatings, comparison testing in the final formulation is recommended instead of deciding from a single test value.

TP800 is a water-based zinc stearate developed for water-based systems. It is still a white powder, but is designed for dispersion and application in aqueous systems. Its published specifications include a zinc content of 10.5%–10.8%, free acid ≤0.7%, volatiles at 105°C ≤0.5%, a melting point of 118–125°C and a fineness of ≤40μm. It can be used in water-based coatings, papermaking and water-based mold release. The difference from regular plastics-grade zinc stearate is not just the chemical name — the medium, dispersion method and application targets differ. For water-based clear PU, PE wood coatings or water-based inks, key evaluations include dispersion in water, clarity, anti-settling, foaming, leveling and sanding performance.

CHNV zinc stearate emulsions include HS2000, HS2030, HS2040 and HS2050. Published specifications: HS2000 solid content 38%–45%, viscosity ≤1300 mPa·s, pH 7–9; HS2030 solid content 28%–32%, viscosity ≤600 mPa·s, pH 7–10; HS2040 solid content 38%–42%, viscosity ≤1000 mPa·s, pH 7–10; HS2050 solid content 46%–50%, viscosity ≤1500 mPa·s, pH 7–10. All are white emulsions, but solid content and viscosity differ, which affects transport efficiency, metering, dispersion, application and final system viscosity. Emulsion selection should not simply follow "higher solid content is better" — it should match the required solid content, viscosity window, addition method and end-use performance.

For PVC, consider zinc content, free acid, volatiles, melting point, particle size, bulk density and product form together. Zinc content reflects composition; free acid may affect compatibility and processing; fineness affects dispersion speed and uniformity; bulk density affects metering, conveying and mixing. More importantly, PVC is rarely a single-additive system, so zinc stearate should be evaluated within the whole stabilizer and lubricant package rather than judged by one indicator. When changing grades, compare initial color, thermal stability time, plasticization, processing torque, plate-out, surface appearance and continuous production performance.

For color or filler masterbatch, the focus is usually on dispersion, lubrication, powder fineness and compatibility with pigments, fillers and the carrier resin. If pigment loading is high or color difference, black spots and particle dispersion are critical, finer grades deserve attention. If processing lubrication and efficiency matter more, torque, melt state, filtration pressure and extrusion stability should also be monitored. Practical evaluation can compare dispersion rating, color difference, screen pressure, extrusion current, surface pitting and continuous production stability before and after addition. Selection should start from the carrier resin, pigment or filler type and target performance rather than only the dosage.

Replacement should not be based on "same chemical name". First, obtain the TDS, COA or test data of the current imported product and confirm zinc content, free acid, volatiles, melting point, particle size, bulk density and product form. Second, look for domestic grades with close values — if the original is ultrafine, focus on SAV250, SAV350 and similar fineness levels; if it is used in water-based systems, evaluate TP800 or zinc stearate emulsions rather than a regular powder. Third, run laboratory trials and production validation comparing dosage, processing torque, dispersion, thermal stability, mold release, plate-out, color and finished-product performance. "Close parameters" is only the starting point; continuous production validation is the final criterion.

There is no single dosage that applies to all industries and formulations. CHNV product literature gives a general recommendation of 0.1%–6%, with the actual dosage determined by the formulation; the website also states that this recommendation does not include stabilizer formulations. In PVC in particular, it should not be read as a fixed 0.1%–6%. A better approach is to set several dosage levels based on the existing formulation and determine the final ratio through processing torque, thermal stability, dispersion, mold release, plate-out and finished-product performance.

Zinc stearate suppliers should not be compared on price alone. Confirm whether the manufacturer offers a complete system covering different particle sizes, bulk densities, powders, water-based grades and emulsions; whether TDS, SDS and batch COA can be supplied consistently; whether key indicators such as zinc content, free acid and fineness are stable between batches; and whether grades can be matched to PVC, PE, masterbatch and coatings applications. CHNV currently offers 15 petrochemical/plastics grades, 4 coatings grades and water-based and emulsion products for zinc stearate, and participated in drafting the HG/T 3667-2012 zinc stearate industry standard. For bulk purchasing, samples, COA and actual production validation remain the final basis for confirming suitability.

Calcium stearate is a metallic stearate with CAS No. 1592-23-0 and the formula Ca(C17H35COO)2, usually supplied as a white powder. It can be used in PE, PP, PVC, ABS, CPE, unsaturated polyester, masterbatch and composite systems, providing lubrication, dispersion, mold release, acid scavenging and co-stabilization depending on the formulation. Its performance is affected by calcium content, free acid, particle size, melting point, bulk density and other stabilizers and lubricants, so the same grade and dosage should not be applied to every system.

CHNV currently offers 13 calcium stearate powder grades: CV500, CV501, CV502, CV510, CV550, CV550S, CV500W, CV500S, CV501S, CV502S, CV520, SCV250 and SCV350. They differ in calcium content, free acid, volatiles, melting point, bulk density, fineness and recommended applications. The 13 grades are not simply high or low grades but a specification portfolio for different processing systems. Selection should start from the application — PE, PP, PVC, ABS, CPE or composites — and then compare parameters.

SCV250 and SCV350 are finer calcium stearate grades. Published specifications: SCV250 is controlled at 500 mesh with a sieve pass rate of ≥99%; SCV350 at 425 mesh with ≥99%. Both have a calcium content of 6.6%–7.0%, free acid ≤0.5% and a melting point of 149–160°C. SCV250 offers finer particle control for systems requiring more uniform dispersion, but whether a 500 mesh grade is appropriate still depends on the resin, equipment, dust control and surface requirements. A higher mesh count does not mean SCV250 is right for every formulation.

In PE and PP polyolefin systems, calcium stearate can provide lubrication, dispersion and absorption of residual acidic or halogen-containing components depending on the process. In production it affects not only chemical performance but also powder conveying, mixing, extrusion and finished-product properties. PE or PP customers should compare free acid, fineness, bulk density and batch consistency in addition to calcium content. For polymerization or demanding continuous processes, validate the effect on equipment operation, screen pressure and product quality through actual processing trials.

In PVC, calcium stearate usually works together with other stabilizers and lubricants, so it should first be evaluated within the complete formulation. Key indicators include calcium content, free acid, volatiles, melting point, fineness and bulk density, together with its synergy with zinc stearate, other metal soaps or lubricants. Pipes, profiles, sheets, films and flexible PVC have different processing temperatures and lubrication requirements, so one grade cannot cover all PVC products. When changing grades, compare plasticization time, processing torque, initial color, thermal stability time, plate-out and surface appearance.

Both are metallic stearates, but one is a calcium soap and the other a zinc soap, so their chemistry and functional focus differ. Calcium stearate is commonly used in PE, PP and PVC for lubrication, acid scavenging and co-stabilization, while zinc stearate has broader lubrication, dispersion and mold release applications in PVC, masterbatch, thermosets and coatings. In PVC they can also work together, so a simple 1:1 replacement is not appropriate. Any replacement should be validated across the whole stabilization and lubrication system, not by observing a single additive.

CHNV offers HS3000, HS3040 and HS3050 calcium stearate emulsions. HS3000: solid content 48%–52%, viscosity ≤1300 mPa·s; HS3040: 40%–43%, ≤500 mPa·s; HS3050: 45%–50%, ≤800 mPa·s. All three have a pH range of 7–12. The differences are therefore not only solid content but also viscosity. Customers requiring higher effective solids delivery can focus on high-solid grades, while systems sensitive to flow and handling should also consider emulsion viscosity. Final selection should also consider compatibility with the water-based system, application conditions and finished performance.

Calcium stearate emulsions are mainly designed for water-based systems and can be used in water-based industrial coatings, water-based wood coatings, papermaking, building materials, water-based mold release and some rubber applications. In water-based coatings and putties they can provide sanding and slip performance depending on the formulation; in papermaking they support anti-blocking and hydrophobicity; in cement mortar and concrete they can improve water repellency. Calcium stearate emulsions and powders cannot be judged against the same technical indicators — emulsions should be evaluated by solid content, viscosity, pH, storage stability and system compatibility.

For powder calcium stearate, focus on calcium content, free acid, volatiles at 105°C, melting point, bulk density and particle size or sieve pass rate. Calcium content reflects composition; free acid relates to reaction degree and formulation compatibility; fineness affects dispersion and mixing; bulk density affects conveying, metering and volumetric feeding. For emulsions, switch to solid content, viscosity, pH and emulsion stability. Supplier evaluation should therefore not be reduced to "purity" and "price" alone.

The general recommendation published by CHNV is 0.1%–6%, with the actual dosage depending on the formulation; the guidance states that it does not include stabilizer formulations. This range should not be read as a fixed ratio for any PVC, PE or PP formulation. Target dosages can differ greatly depending on the function, such as lubrication, dispersion or participation in a stabilization system, and should be adjusted together with other additives. Gradient trials followed by evaluation of processing torque, dispersion, stability, plate-out and finished performance are recommended.

First confirm the calcium content, free acid, fineness, melting point, volatiles, bulk density and product form of the imported product. For regular powder, look for domestic grades with similar fineness and density; for ultrafine products, focus on SCV250 and SCV350; for emulsions, match solid content, viscosity, pH and emulsion stability. Then compare plasticization, lubrication, stability, dispersion, plate-out and final product performance in actual production. The logic is "parameter matching → laboratory trial → pilot/production validation", not merely finding the same chemical name.

Beyond price and basic indicators, consider whether the manufacturer offers different particle sizes, bulk densities and emulsion systems, has continuous batch production and testing capability, and can consistently supply TDS, SDS and batch COA. For long-term industrial customers, batch consistency is often more important than a single sample meeting specifications. CHNV currently offers 13 calcium stearate powder grades and the HS3000, HS3040 and HS3050 emulsions, and participated in drafting the HG/T 2424-2012 calcium stearate industry standard.

N,N'-ethylene bis stearamide, or EBS, has CAS No. 110-30-5, the formula C38H76N2O2 and a molecular weight of 593. It is a fatty acid bisamide processing aid that can provide lubrication, dispersion, mold release and anti-blocking depending on the material system. It is used in ABS, PS, PVC, PA, polyolefins and PC, as well as in masterbatch, rubber, elastomers, powder coatings, adhesives, powder metallurgy and metalworking. EBS is therefore not a single-function lubricant, and selection must be based on the intended function.

CHNV offers EBS in three forms: granules, powder and a water-based emulsion. EBS-1050 is a white or light-yellow granule and EBS-200 is a white or light-yellow powder; HS8035 is an EBS emulsion for water-based systems. The granule and powder grades have similar chemical specifications, and one key difference is physical form and its effect on feeding, dust and mixing. HS8035 is an emulsion evaluated by solid content, viscosity, pH and particle size, so it should not be compared with EBS-1050 or EBS-200 using the same indicator set.

The published specifications of EBS-1050 and EBS-200 are the same: appearance is white or light-yellow granules and white or light-yellow powder respectively; amine value ≤2.5 mgKOH/g; Gardner color ≤3; free acid value ≤10 mgKOH/g; melting point 142–146°C; volatiles at 80°C ≤0.5%. They should not be viewed as a higher and a lower grade, but selected based on granule or powder feeding, conveying, dust, metering and dispersion requirements.

If the production line uses automatic conveying and metering or requires lower dust, the granule EBS-1050 is worth evaluating. If the formulation needs rapid pre-mixing with other powders, or the existing system already feeds powders, EBS-200 may be more convenient. Product form is not the only criterion — actual melt dispersion, processing torque, mold release and finished-product performance should also be tested. Because the main chemical specifications are close, production-process compatibility matters more than a parameter table alone.

HS8035 is CHNV's water-based EBS emulsion. Published specifications: solid content 35±2%, viscosity at 25°C ≤150 mPa·s, pH 7–9, average particle size ≤5.0 μm, appearance white emulsion. It can be used in coatings, inks and leather, and in plastics, rubber and textiles depending on the formulation. As a water-based emulsion, key evaluations include emulsion stability, system compatibility, addition sequence, final solid content and its effect on the finished surface.

In color masterbatch or highly filled systems, EBS can provide both lubrication and pigment/filler dispersion. It helps reduce friction between pigments or fillers and between them and the resin, allowing more uniform distribution in the carrier resin. Final dispersion still depends on pigment type, carrier resin, filler loading, processing temperature, screw configuration and shear intensity. Evaluation should therefore compare dispersion rating, color difference, black spots, filtration pressure, extrusion current and continuous production stability rather than only whether the product feels smoother.

In PVC and some engineering plastics, EBS can act as a processing lubricant with internal or external lubrication depending on the system, and can also assist mold release and processing. In ABS, PS, PA, PC and polyolefins, differences in resin polarity, processing temperature and compatibility lead to different EBS behavior. Evaluation should focus on melt flow, processing torque, mold release, surface appearance and possible plate-out or side effects. A dosage validated in one plastic cannot be directly transferred to another resin.

Yes, but performance depends on the resin, mold and processing conditions. In some thermoplastics, thermosets and rubber systems, EBS can reduce friction between the material and processing equipment or mold and improve release. However, over-dosing does not necessarily improve release further and may affect surface appearance, printing, bonding or other downstream processes. When release is the main target, several dosage levels should be tested to find the performance balance.

EBS is a fatty acid bisamide, while zinc stearate and calcium stearate are metallic fatty acid salts, so their chemical structures differ. Although all may provide lubrication, dispersion and mold release, they differ in resin compatibility, heat resistance, migration, lubrication mechanism and synergy with other additives. They should not be directly substituted at the same dosage simply because all are called lubricants. First determine whether the formulation needs internal lubrication, external lubrication, dispersion, mold release or another processing function.

CHNV literature gives a general EBS recommendation of 0.1%–6%, with the actual dosage depending on the formulation; the guidance states that it does not include stabilizer formulations. The wide range reflects the different functions EBS can serve. Effective dosages for auxiliary lubrication, masterbatch dispersion, mold release or other industrial systems can differ significantly. Setting dosage gradients based on the existing formulation and evaluating processing torque, dispersion, mold release, surface appearance and finished performance is more reliable.

Compare amine value, Gardner color, free acid value, melting point, volatiles and product form first. If the imported product is granular, compare with granular EBS; if it is a powder, focus on powder form and dispersion; for water-based products, also compare solid content, viscosity, pH, average particle size and emulsion stability. Then compare processing torque, dispersion, color, mold release, surface appearance and long-term continuous processing in the actual formulation. Replacement should follow "indicator matching + application testing", not CAS number alone.

EBS-1050 and EBS-200 should be stored and transported in a cool, ventilated environment away from moisture, high temperature, ignition sources and corrosive conditions. HS8035 is a water-based emulsion with different requirements: keep it sealed, avoid long-term open exposure that can cause surface skinning, and stir well before use. Granules, powder and emulsion therefore require different storage, transport and handling even though all are EBS products.

Calcium hydroxide has the formula Ca(OH)2 and CAS No. 1305-62-0, and is usually a white powder at room temperature. Its alkalinity and calcium source make it useful in petroleum refining and desulfurization, calcium-based greases, construction materials, metallurgy, sugar refining, leather processing and glass manufacturing. Different applications have very different requirements for Ca(OH)2 content, whiteness, Fe, Mg, Si, Al, heavy metals, moisture and fineness, so industrial calcium hydroxide cannot be selected on "purity" alone.

CHNV currently offers GH65, FM100, FM300 and FM700. Key specifications: Ca(OH)2 content ≥92%, ≥98%, ≥96% and ≥95% respectively; whiteness ≥92, ≥96, ≥95 and not listed for FM700; MgO ≤0.5% for all; SiO2 ≤0.03% for all; Al2O3 ≤0.02% for all; Fe2O3 ≤0.01%, ≤0.01%, ≤0.01% and ≤0.1% respectively; moisture ≤1.0% for all; heavy metals (as Pb) ≤0.002% for all; 325 mesh sieve pass rate ≥99.5%, ≥99.5%, ≥98% and ≥98.5% respectively. The four grades are therefore not a simple ranking by number but different combinations of purity, whiteness, impurities and fineness.

If high Ca(OH)2 content and high whiteness are the priority, FM100 is the first grade to evaluate, with Ca(OH)2 ≥98% and whiteness ≥96. FM300 has Ca(OH)2 ≥96% and whiteness ≥95 and can be used where both purity and appearance matter. FM700 has Ca(OH)2 ≥95%, but whiteness is not separately listed and its Fe2O3 control differs from the other three, so it should not be treated simply as a lower grade of FM100 or FM300. GH65 has Ca(OH)2 ≥92% and a 325 mesh pass rate ≥99.5%, and should be evaluated against the specific application, cost, reactivity and fineness requirements.

According to current published specifications, FM100 has Ca(OH)2 ≥98%, the highest nominal content among GH65, FM100, FM300 and FM700, with whiteness ≥96 and a 325 mesh pass rate ≥99.5%. However, the highest content does not mean FM100 suits every application. Some processes care more about Fe, particle size, reactivity, whiteness or cost, so the downstream process should determine the final choice.

Ca(OH)2 content is the first indicator, but not the only one. Also consider MgO, SiO2, Al2O3, Fe2O3, Mn3O4, SO3, moisture, heavy metals and other process-relevant impurities. Two products with similar high Ca(OH)2 content but different Fe levels can behave differently in high-whiteness products or impurity-sensitive processes. When purchasing "high-purity calcium hydroxide", request a complete TDS and batch COA rather than accepting a single "98%" figure.

No. High purity mainly refers to Ca(OH)2 content and impurity control, while whiteness mainly reflects visual appearance. FM100, for example, has Ca(OH)2 ≥98% and whiteness ≥96, while FM300 has ≥96% and ≥95. The indicators are related but not interchangeable. Customers producing high-whiteness mortar or decorative materials, or sensitive to final color, should focus on whiteness and impurities such as Fe; applications focused on reaction efficiency should evaluate effective content and related impurities.

The 325 mesh pass rate indicates the proportion of powder passing a 325 mesh screen and is one important measure of fineness. CHNV currently lists ≥99.5% for GH65 and FM100, ≥98% for FM300 and ≥98.5% for FM700. Fineness can affect powder dispersion, mixing uniformity, effective contact area and reaction speed in some processes. However, a 325 mesh pass rate does not fully describe the particle size distribution; strict requirements for ultrafine particles or reactivity should also be evaluated with detailed particle size testing and application results.

If the process is sensitive to iron, check Fe2O3 directly rather than inferring from whiteness or Ca(OH)2 content. CHNV currently lists Fe2O3 ≤0.01% for GH65, FM100 and FM300, and ≤0.1% for FM700. All four have MgO ≤0.5%, SiO2 ≤0.03% and Al2O3 ≤0.02%. Customers with strict low-Fe requirements can therefore start with the first three grades, but selection should still combine content, whiteness, fineness and the acceptable impurity range for the downstream process rather than comparing Fe alone.

These applications usually focus first on effective Ca(OH)2 content, fineness, moisture and reaction-relevant impurities. Higher effective content means a higher proportion of Ca(OH)2 available for reaction per unit mass, while suitable fineness helps increase contact area. Final desulfurization or neutralization efficiency also depends strongly on gas composition, temperature, humidity, contact method, residence time, equipment design and actual dosing. "98% is not automatically better than 95%" — compare unit throughput, reaction efficiency and overall cost under the actual process conditions.

In some calcium-based grease processes, calcium hydroxide participates in forming the calcium soap system, so content, fineness, moisture, impurities and batch consistency can all affect saponification. Large fluctuations in impurities or effective content may require adjustments to charging and reaction conditions. Such customers should monitor continuous batch COA in addition to Ca(OH)2 content, and validate reaction time, system state and final grease performance through actual saponification. For import replacement, work backwards from the original product data instead of simply choosing the highest purity.

First obtain the TDS, COA or in-house test data of the imported product to establish a complete baseline. Compare at least Ca(OH)2 content, whiteness, MgO, SiO2, Al2O3, Fe2O3, moisture, heavy metals and particle size or sieve pass rate. Then look for the closest match among GH65, FM100, FM300 and FM700. If the imported product emphasizes 98% purity, evaluate FM100 first; if low Fe or fineness actually determines performance, 98% alone is not a valid replacement criterion. Finish with laboratory and production validation comparing dosage, reaction speed, process stability, final product indicators and overall cost.

High Ca(OH)2 purity alone does not make a grade food-grade. Food use must comply with the relevant food safety regulations, product grade, production and quality system requirements, test items and local regulations. CHNV lists food acidity regulator (E526) as an application scenario, but whether a specific grade can be used in food production depends on the currently valid qualifications, specification documents and test data for that grade. Without confirmed food-use documentation, high-purity industrial grades such as FM100 should not be treated as food-grade calcium hydroxide.

Store calcium hydroxide in a cool, ventilated place, protect it from moisture and keep it separate from acids. Because it is alkaline and reacts with acids, warehousing and production management should avoid mixed storage with acidic materials. CHNV also requires keeping it away from heat sources and separate from acids. Specific handling precautions, transport, spill response and personal protection requirements should follow the latest SDS for the relevant product.

Industrial customers should not compare only "92%, 95%, 98%" and price per tonne. Also compare whether the supplier has clear specification tiers, whether Ca(OH)2 content, Fe, Mg, Si, Al, heavy metals, whiteness and fineness are controlled consistently over time, whether TDS, SDS and batch COA can be supplied continuously, and whether grades can be matched to the actual process. CHNV currently offers GH65, FM100, FM300 and FM700, forming different combinations of purity, whiteness and fineness for further testing and matching in industrial applications.