What is Lead Distearate CAS 1072-35-1?

Lead Distearate, also known as lead(II) stearate, is a lead salt of stearic acid with the molecular formula C36H70O4Pb. It is supplied as a white to off-white powder or flake and is used mainly as a metallic soap additive in PVC processing.

Why is Lead Distearate used in rigid PVC?

It acts as both a heat stabilizer and a lubricant, helping to reduce thermal degradation, discoloration, and processing friction during extrusion, calendering, and molding. These properties make it suitable for rigid PVC pipes, profiles, and cable compounds.

Is Lead Distearate a lubricant or only a heat stabilizer?

It provides both functions. In PVC compounding it works as an internal and external lubricant while also contributing to thermal stability, so it can improve melt flow, reduce sticking, and help protect the polymer during processing.

What is the typical lead content and physical form of Lead Distearate?

Commercial grades are usually white powder or flakes with a lead content commonly in the range of about 27-30%, though supplier specifications can vary. The solid form makes it easy to blend into dry PVC formulations.

Is Lead Distearate suitable for transparent or food-contact PVC?

No. As a lead-based stabilizer, it is intended for opaque industrial PVC applications and is not suitable for transparent or food-contact articles. Lead-containing additives require appropriate industrial hygiene and regulatory controls.

How is Lead Distearate used with other PVC additives?

It is often combined with other lead stabilizers or co-stabilizers such as tribasic lead sulfate and dibasic lead stearate to balance heat stability and lubrication. The exact combination depends on the processing temperature, required surface finish, and electrical or mechanical performance of the PVC compound.

Lead Distearate CAS 1072-35-1

Lead Distearate (CAS 1072-35-1) is a metallic soap derived from stearic acid, widely used in rigid PVC formulations as a heat stabilizer and internal/external lubricant. It plays a functional role in improving thermal stability during processing while supporting melt flow and surface finish in extrusion and molding operations.

In industrial supply, Lead Distearate is typically provided as a solid material in powder or flake form, suitable for direct incorporation into PVC dry blends or compound formulations. Standard export packaging is available, with supporting documents such as COA, TDS, and SDS provided for procurement and regulatory handling.

CAS: 1072-35-1
Synonyms: Lead(II) distearate; Lead stearate (distearate form)
Einecs: 214-014-9
Molecular Formula: C36H70O4Pb
Grade: Industrial grade (PVC stabilizer use)
Package: Available in standard export packaging for solid chemicals; packaging can be arranged based on order quantity and handling requirements

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Product Description

1 Physicochemical Properties

2 Typical Applications

3 Packaging

4 Storage

Physicochemical Properties

Appearance	White to slightly off-white powder or flakes
Odor	Odorless or faint fatty odor
Lead Content	Typically around 27–30%
Melting Point	Approx. 100–115°C
Density	Approx. 1.1–1.2 g/cm³
Solubility	Insoluble in water; soluble in hot organic solvents
Volatile Matter	Low under normal conditions
Form	Solid (powder or flake)

Typical Applications

PVC heat stabilizer: Used in rigid PVC formulations to improve thermal stability during extrusion, calendaring, and molding processes.
Lubricant in plastics processing: Functions as both internal and external lubricant, enhancing melt flow and reducing equipment adhesion.
Cable and pipe compounds: Applied in PVC compounds for cables, pipes, and profiles where thermal processing stability is required.
Processing aid in polymer compounding: Helps maintain processing consistency and surface quality in PVC-based systems.

For related metal stearate comparisons in PVC and lubricant systems, see Calcium Stearate, Lithium Stearate, and Magnesium Stearate.

Packaging

Lead Distearate is supplied as a solid material and is typically packed in moisture-resistant bags with inner lining or in fiber drums suitable for powder or flake chemicals. Packaging is designed to minimize dust generation and prevent contamination during handling and transport.

For export shipments, materials are packed to maintain stability and handling safety during long-distance transport. Packaging formats can be adjusted depending on order volume and customer handling requirements.

Storage

Store in a cool, dry, and well-ventilated environment. Keep containers tightly sealed to prevent moisture absorption and contamination. Avoid exposure to direct sunlight and sources of heat. Proper handling procedures should be followed due to the presence of lead compounds.

FAQ - Technical & Supply Chain

Q:
What is Lead Distearate CAS 1072-35-1?

A: Lead Distearate, also known as lead(II) stearate, is a lead salt of stearic acid with the molecular formula C36H70O4Pb. It is supplied as a white to off-white powder or flake and is used mainly as a metallic soap additive in PVC processing.
Q:
Why is Lead Distearate used in rigid PVC?

A: It acts as both a heat stabilizer and a lubricant, helping to reduce thermal degradation, discoloration, and processing friction during extrusion, calendering, and molding. These properties make it suitable for rigid PVC pipes, profiles, and cable compounds.
Q:
Is Lead Distearate a lubricant or only a heat stabilizer?

A: It provides both functions. In PVC compounding it works as an internal and external lubricant while also contributing to thermal stability, so it can improve melt flow, reduce sticking, and help protect the polymer during processing.
Q:
What is the typical lead content and physical form of Lead Distearate?

A: Commercial grades are usually white powder or flakes with a lead content commonly in the range of about 27-30%, though supplier specifications can vary. The solid form makes it easy to blend into dry PVC formulations.
Q:
Is Lead Distearate suitable for transparent or food-contact PVC?

A: No. As a lead-based stabilizer, it is intended for opaque industrial PVC applications and is not suitable for transparent or food-contact articles. Lead-containing additives require appropriate industrial hygiene and regulatory controls.
Q:
How is Lead Distearate used with other PVC additives?

A: It is often combined with other lead stabilizers or co-stabilizers such as tribasic lead sulfate and dibasic lead stearate to balance heat stability and lubrication. The exact combination depends on the processing temperature, required surface finish, and electrical or mechanical performance of the PVC compound.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

Documents

COA, TDS, SDS/MSDS and packing details are available on request.

Quotation

Send the CAS number, grade, quantity, packing preference and destination.

Sample & Supply

Support is available for samples, trial orders, bulk and repeat supply.

Storage & Shipping

Product-specific conditions are confirmed before order.

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