Is Zinc Stearate interchangeable with Calcium Stearate?

Not automatically. Both are metal soaps, but the metal ion changes lubrication, processing, surface and formulation behaviour. Compare the agreed grade specification and validate the candidate in the actual PVC, rubber or coating system rather than substituting solely because the products have related names.

Which parameters matter when specifying industrial Zinc Stearate?

Specify zinc content, free fatty acid, volatile matter or heating loss, fineness, apparent density, melting range, packing and release test methods. The required profile should be linked to the resin or binder and process, because the same CAS identity does not define powder handling or final-formulation behaviour.

Why should Zinc Stearate powder form be confirmed before ordering?

Powder fineness and apparent density influence feeding, dust management, dispersion and handling in production. Confirm the required powder characteristics and packaging configuration with the offered grade, especially where automated transfer, high-speed compounding or a sensitive surface finish is involved.

Zinc Stearate (ZnSt₂) CAS 557-05-1

Zinc Stearate (zinc distearate, ZnSt₂), CAS 557-05-1, is a metal-soap powder used as a lubricant and release additive in PVC, rubber and coating formulations. Grade selection can cover zinc content, free fatty acid, volatile matter, fineness and apparent density. Shipment documents include COA, TDS and SDS.

CAS: 557-05-1
Synonyms: Zinc Distearate; Stearic Acid Zinc Salt; Zinc Octadecanoate
Einecs: Not specified
Molecular Formula: C36H70O4Zn
Grade: Industrial zinc stearate powder for polymer, rubber and coating formulations; grade agreed for the intended process
Package: Typically 20 kg or 25 kg multi-wall bags with PE liner; final pack, label and pallet configuration confirmed before release

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Product Description

Zinc Stearate (ZnSt₂) CAS 557-05-1 is zinc distearate (stearic acid zinc salt), with molecular formula C36H70O4Zn.

Synonyms: Zinc distearate; stearic acid zinc salt; zinc octadecanoate.

CAS: 557-05-1.

Molecular formula: C36H70O4Zn.

It is supplied as a fine powder.

It is used as a processing lubricant, release additive and flow-control component in industrial formulations.

It is evaluated in PVC compounds, extrusion and moulding for lubrication and release behaviour.

It is also used in rubber compounding and coating, powder and pigment-containing systems.

Performance depends on the polymer or binder, loading level, process temperature and additive package.

Grades are selected by zinc content, free fatty acid, volatile matter, fineness and apparent density.

Zinc stearate is not automatically interchangeable with calcium stearate.

Specify zinc content, free fatty acid, volatile matter, fineness, apparent density, melting range and the intended process.

For purchasing, confirm the required powder characteristics, then compare fineness, apparent density, zinc content, free fatty acid and volatile matter.

Keep containers closed and follow the current SDS for storage and handling.

Use suitable PPE and exposure controls when handling the material.

Confirm zinc content, free fatty acid, volatile matter, fineness and apparent density on the COA.

Confirm grade, packaging, and specification as required.

The page is an RFQ entry point and does not state stock, price, MOQ, or fixed lead time.

For an RFQ, state the intended application, required grade, quantity, packaging, destination, and document needs.

FAQ - Technical & Supply Chain

Q:
Is Zinc Stearate interchangeable with Calcium Stearate?

A: Not automatically. Both are metal soaps, but the metal ion changes lubrication, processing, surface and formulation behaviour. Compare the agreed grade specification and validate the candidate in the actual PVC, rubber or coating system rather than substituting solely because the products have related names.
Q:
Which parameters matter when specifying industrial Zinc Stearate?

A: Specify zinc content, free fatty acid, volatile matter or heating loss, fineness, apparent density, melting range, packing and release test methods. The required profile should be linked to the resin or binder and process, because the same CAS identity does not define powder handling or final-formulation behaviour.
Q:
Why should Zinc Stearate powder form be confirmed before ordering?

A: Powder fineness and apparent density influence feeding, dust management, dispersion and handling in production. Confirm the required powder characteristics and packaging configuration with the offered grade, especially where automated transfer, high-speed compounding or a sensitive surface finish is involved.

Ordering & Documentation

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