Polymer Base: Viscosity 500-100,000 cSt

Component Specifications

Definition

A polymer base is the primary polymeric matrix that forms the continuous phase in silicone rubber compounds, providing structural integrity, chemical resistance, and thermal stability. It serves as the foundation to which reinforcing fillers, crosslinking agents, and additives are incorporated to achieve desired mechanical, electrical, and processing properties in the final rubber product.

Working Principle

The polymer base functions as the backbone of silicone rubber, where polymer chains (typically polydimethylsiloxane) provide flexibility and elasticity. During vulcanization, crosslinking agents create covalent bonds between polymer chains, transforming the base into a three-dimensional network that imparts durability and resilience while maintaining the material's inherent properties like thermal stability and chemical inertness.

Materials

Polydimethylsiloxane (PDMS) with varying molecular weights, vinyl-functional or methyl-functional groups, and controlled viscosity grades. May include platinum or peroxide catalysts for crosslinking.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Viscosity	500-100,000 cSt
Specific Gravity	0.97-1.05
Tensile Strength	5-12 MPa
Hardness (Shore A)	20-80
Elongation At Break	200-800%
Operating Temperature	-60°C to 250°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 1629, ISO 7619-1, DIN 53504, ASTM D2000

Parent Products

This component is used in the following industrial products

Silicone Rubber

A synthetic elastomer composed of silicone polymers with exceptional temperature resistance, flexibility, and chemical stability.

View Product Details

Engineering Analysis

Risks & Mitigation

Inconsistent viscosity leading to processing defects
Contamination from impurities affecting crosslinking
Thermal degradation if exposed beyond specified temperature limits
Poor adhesion if surface treatment is inadequate

FMEA Triads

Trigger: Inadequate mixing of polymer base with fillers
Failure: Non-uniform rubber properties and weak spots
Mitigation: Implement controlled mixing procedures and quality checks for homogeneity

Trigger: Exposure to moisture during storage
Failure: Premature crosslinking or reduced shelf life
Mitigation: Use sealed containers and controlled humidity storage environments

Trigger: Incorrect catalyst-to-base ratio
Failure: Incomplete vulcanization or over-curing
Mitigation: Calibrate dosing equipment and conduct regular batch testing

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

±5% for viscosity and specific gravity, ±3 Shore A for hardness

Test Method

ISO 1629 for classification, ISO 7619-1 for hardness, ASTM D412 for tensile properties

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Polymer Base

Manufacturer profiles associated with Polymer Base.

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Related Components

Tie Layer

Tie layer is a bonding component in multi-layer co-extruded barrier films that ensures adhesion between incompatible polymer layers.

Mold Release Coating

Specialized coating applied to molds to facilitate easy release of silicone seal rings during manufacturing.

Silicone Polymer Base

Silicone polymer base is a high-temperature resistant polymer material used as the foundational component in silicone rubber compounds for industrial applications.

Reinforcing Filler

Reinforcing filler is a material added to silicone rubber compounds to enhance mechanical properties, thermal stability, and durability in high-temperature applications.

Frequently Asked Questions

What is the primary function of a polymer base in silicone rubber?

The polymer base provides the foundational matrix that determines the rubber's elasticity, thermal stability, and chemical resistance, serving as the continuous phase for additives and fillers.

How does the polymer base affect silicone rubber properties?

The molecular weight, functional groups, and viscosity of the polymer base directly influence hardness, tensile strength, elongation, and processing characteristics of the final rubber product.

Can polymer bases be customized for specific applications?

Yes, polymer bases can be tailored with different molecular structures, catalysts, and additives to meet requirements for automotive seals, medical devices, electronics insulation, or high-temperature gaskets.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Polymer Base