Zinc stearate, identified by CAS:557-05-1, is mainly used as a lubricant, release agent, water-repellent additive, and processing aid in plastics, rubber, coatings, inks, cosmetics, and selected pharmaceutical applications. Its practical value comes from its low water affinity and its ability to reduce friction between materials, equipment surfaces, and molded products. At Xinshangrui, I help B2B buyers evaluate zinc stearate by application, grade requirements, particle characteristics, and documentation rather than treating every product as interchangeable.
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In chemical terms, zinc stearate is the zinc salt of stearic acid, commonly represented by the formula Zn(C18H35O2)2. Its commonly listed molecular weight is approximately 632.33 g/mol. Because commercial specifications can differ by manufacturing method and application grade, I recommend confirming purity, moisture, free fatty acid, particle size, and thermal behavior before approving a supply source.
The most common use of zinc stearate is as a lubricant and release aid. Its fatty-acid structure provides a relatively hydrophobic surface, while the zinc component contributes to its identity as a metal soap. In manufacturing, this combination can help reduce sticking, improve material flow, and support cleaner separation from molds or processing equipment.
Zinc stearate is used in some plastic formulations as an external lubricant, internal lubricant, dispersing aid, or mold-release component. It may help reduce friction during compounding and molding, especially when the formulation requires improved processing behavior. In PVC-related systems, zinc stearate can also be used as part of a broader additive package, but it should not automatically be treated as a complete stabilizer or as a substitute for a validated stabilizer system.
The correct dosage depends on the resin, processing equipment, temperature profile, and other additives. Too little may provide limited processing benefit, while too much can affect surface appearance, adhesion, plate-out, or downstream printing and bonding. I recommend testing the target formulation under actual processing conditions before moving from laboratory evaluation to routine purchasing.
In rubber and elastomer processing, zinc stearate may function as a lubricant, release agent, or processing aid. It can support smoother handling of compounds and may reduce adhesion between rubber and metal or between a compound and a mold, depending on the formulation. Its use must be considered alongside zinc oxide, accelerators, sulfur systems, fillers, oils, and other compounding ingredients.
For rubber buyers, the important question is not simply whether zinc stearate is present, but whether it influences cure behavior, dispersion, surface finish, and demolding in the selected compound. A supplier should provide consistent batch information so that changes in moisture, free stearic acid, or particle size do not create unexpected processing variation.
Zinc stearate can be incorporated into selected coatings, paints, and printing inks to provide slip, matting assistance, water-repellent behavior, or improved surface feel. In powder coatings and related dry systems, its fine-powder form may influence flow, surface texture, and resistance to blocking. The result depends strongly on resin chemistry, dispersion quality, curing conditions, and loading level.
Because excessive metallic soap can interfere with intercoat adhesion or final appearance, I advise buyers to define the desired performance first. For example, a formulation designed for surface slip may require a different particle-size profile from one designed primarily for mold release or powder flow. Small-scale drawdown, curing, and adhesion testing can reduce the risk of selecting a technically suitable but application-incompatible grade.
In cosmetics, zinc stearate may be used as a texture modifier, pigment carrier, lubricating powder, or adhesion-supporting ingredient in certain powder products. Its hydrophobic character can contribute to a smoother feel and may help pigments distribute across the skin or product matrix. However, cosmetic use requires confirmation of the applicable ingredient, impurity, microbiological, and regulatory requirements for the destination market.
I do not recommend using an industrial grade in a personal-care formulation without checking its documentation and suitability. Buyers should request the relevant specification, safety information, production details, and any available compliance documents before qualification. The final decision should be made by the formulator and regulatory team based on the finished product and market requirements.
Zinc stearate may appear in certain technical powder or pharmaceutical-related applications where lubrication and flow behavior are important. Its acceptability depends on the intended use, local regulations, pharmacopeial expectations, and the complete manufacturing process. A CAS number identifies the chemical substance, but it does not by itself confirm suitability for a regulated application.
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Zinc stearate can form a lubricating layer at interfaces between particles, polymer chains, molds, and equipment surfaces. This may reduce friction and help materials move more consistently through processing machinery. The actual effect is formulation-specific and should be verified through torque, pressure, demolding, surface, or flow observations appropriate to the application.
Its low water affinity and fatty-acid structure can make zinc stearate useful where a dry release effect is needed. It may reduce adhesion between a processed material and a mold surface, helping improve product removal. Nevertheless, mold temperature, mold finish, additive migration, and the composition of the base material can be equally important to the final result.
Zinc stearate is generally regarded as water-insoluble, which supports its use in selected water-repellent and hydrophobic powder applications. This property can influence powder flow, surface feel, and moisture interaction. It does not mean that a formulation containing zinc stearate will automatically become waterproof, because coating continuity, binder selection, porosity, and dosage remain decisive factors.
Commercial zinc stearate can vary in purity, whiteness, particle size, moisture content, free fatty acid level, bulk density, and surface treatment. Some buyers need a general industrial grade for plastics or rubber, while others require tighter control for coatings, cosmetics, or specialized powder systems. The best grade is therefore defined by the finished application and process conditions, not by the CAS number alone.
| Buyer Requirement | Why It Matters | What I Recommend Checking |
|---|---|---|
| High processing consistency | Batch variation can affect lubrication and dispersion. | Assay, moisture, particle size, and batch COA data |
| Fine powder performance | Particle characteristics can influence flow and surface finish. | Particle-size method, bulk density, and agglomeration tendency |
| Light-colored products | Color and impurities may affect appearance. | Whiteness, color description, and impurity limits |
| Regulated or sensitive use | Technical suitability may not equal regulatory suitability. | SDS, intended-use statement, traceability, and market-specific documents |
When I assess a zinc stearate offer, I begin with identity and basic chemical information, then move to functional specifications. The commonly listed molecular weight is about 632.33 g/mol, but this value should not replace testing of the supplied material. I also review appearance, odor, assay or zinc content, moisture, free fatty acid, particle size, and residue or impurity limits where relevant.
Thermal behavior is another important consideration because processing temperatures vary across plastics, rubber, coatings, and other systems. Some commercial technical descriptions cite softening or melting behavior in the approximate range of 120–130 °C, but the observed range may vary with grade, purity, measurement method, and sample condition. Buyers should request the supplier’s actual specification and test method instead of applying a generic temperature value to every batch.
I recommend describing the application before requesting a quotation. Useful information includes the base material, intended function, processing temperature, required dosage, packaging format, annual demand, destination country, and any regulatory restrictions. This allows the supplier to recommend a realistic grade and identify documentation gaps early.
A dependable B2B supplier should be able to discuss the product specification, packaging, lot identification, safety documentation, and quality-control approach. Xinshangrui can support buyers with zinc stearate CAS:557-05-1 sourcing discussions, technical specification review, packaging coordination, and export-oriented communication. Availability, minimum order quantity, and lead time should be confirmed for the specific grade and destination rather than assumed from a general product listing.
A practical trial should measure the property that matters to the buyer, such as torque reduction, demolding, surface appearance, powder flow, adhesion, dispersion, or moisture resistance. The test should compare the proposed zinc stearate with the buyer’s current material under consistent conditions. This evidence-based approach is more reliable than selecting only by price or by a broad claim such as “high performance.”
Zinc stearate CAS:557-05-1 is primarily used as a lubricant, release agent, hydrophobic additive, and processing aid across plastics, rubber, coatings, inks, cosmetics, and selected technical formulations. Its benefits are real but application-dependent, and the same grade may not deliver the same result in every formulation. The chemical identity, molecular weight of approximately 632.33 g/mol, and CAS number provide a starting point, not a complete purchasing specification.
My recommended next step is to define the required function, request the supplier’s current technical documents, and conduct a controlled application trial. If you are sourcing zinc stearate for a specific industry or export market, Xinshangrui can review your target specifications, packaging needs, estimated quantity, and documentation requirements before preparing a suitable quotation. This process helps buyers reduce qualification risk and select a product based on measurable performance rather than assumptions.
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