Structured Manufacturing Data (2026)

Liquid Silicone Rubber

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Liquid Silicone Rubber used in the Rubber and Plastic Product Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Liquid Silicone Rubber is characterized by the integration of Base Polymer (Part A) and Cross-linker (Part B). In industrial production environments, manufacturers listed on CNFX commonly emphasize Polydimethylsiloxane (PDMS) Base Polymer construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A two-part, platinum-catalyzed silicone elastomer that cures at elevated temperatures to form durable, flexible rubber parts.

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Product Specifications

Technical details and manufacturing context for Liquid Silicone Rubber

Definition
Liquid Silicone Rubber (LSR) is a high-purity, two-component silicone elastomer system consisting of a base polymer and a curing agent. It undergoes addition-cure vulcanization via platinum catalysis when heated, transforming from a liquid state into a solid, flexible rubber with excellent thermal stability, chemical resistance, and biocompatibility. It is processed using specialized liquid injection molding (LIM) equipment.
Working Principle
LSR is supplied as two liquid components (Part A and Part B). These components are precisely metered, mixed, and injected into a heated mold cavity. The heat activates the platinum catalyst within the compound, initiating a hydrosilylation addition reaction. This cross-links the silicone polymer chains, causing the material to cure (vulcanize) from a liquid into a solid elastomer without producing by-products, resulting in a dimensionally stable, high-integrity rubber part.
Common Materials
Polydimethylsiloxane (PDMS) Base Polymer, Cross-linker (typically containing Si-H groups), Platinum Catalyst, Filler (e.g., fumed silica)
Technical Parameters
  • Hardness of the cured rubber, indicating its resistance to indentation and overall firmness. (Shore A) Standard Spec
Components / BOM
  • Base Polymer (Part A) Part
    Contains the primary vinyl-functionalized polydimethylsiloxane (PDMS) polymer and the platinum catalyst.
    Material: Polydimethylsiloxane, Platinum Catalyst Complex, Fillers, Pigments
  • Cross-linker (Part B) Part
    Contains the cross-linking agent (typically with Si-H groups) and an inhibitor to control cure onset.
    Material: Polymethylhydrosiloxane, Inhibitor, Fillers
  • Filler Part
    Reinforces the polymer matrix, improving mechanical properties like tear strength and modulus.
    Material: Fumed Silica, Precipitated Silica
  • Pigment / Colorant Part
    Imparts color to the final cured product. Must be thermally stable and non-inhibiting.
    Material: Inorganic Pigments (e.g., iron oxides), Certified Organic Pigments
  • Additives Package Part
    May include heat stabilizers, flame retardants, or other property modifiers specific to the grade.
    Material: Various specialty chemical compounds (e.g., platinum catalyst stabilizers, process aids)

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Liquid Silicone Rubber.

LSR Liquid Injection Molding Silicone LIM Silicone Platinum-Cure Silicone Rubber Medical Grade Silicone Rubber platinum-catalyzed liquid silicone rubber high-temperature cure silicone elastomer flexible rubber parts manufacturing two-part silicone rubber for molding durable PDMS rubber material

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 10 MPa (100 bar) depending on hardness and geometry
flow rate: Viscosity-dependent: 10,000-100,000 mPa·s at 25°C (varies by grade)
temperature: -60°C to 230°C continuous, up to 250°C intermittent
slurry concentration: Not applicable - homogeneous liquid system
Media Compatibility
✓ Medical/biological fluids ✓ Food-grade applications ✓ Automotive fluids (coolants, oils)
Unsuitable: Concentrated acids/bases or solvents (ketones, aromatics)
Sizing Data Required
  • Required hardness (Shore A scale)
  • Cure temperature/time constraints
  • Part geometry complexity (mold flow considerations)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Thermal degradation
Cause: Exposure to temperatures exceeding the material's continuous use rating, leading to loss of elasticity, hardening, or cracking.
Chemical incompatibility
Cause: Contact with incompatible fluids (e.g., strong acids, bases, solvents, or certain oils) causing swelling, softening, or structural breakdown.
Maintenance Indicators
  • Visible surface cracking or crazing, especially at stress points or bends
  • Audible squeaking or grinding noise during operation, indicating loss of lubrication or internal friction
Engineering Tips
  • Implement strict temperature monitoring and control systems to prevent operation outside the specified thermal range (typically -60°C to 200°C for most LSR grades).
  • Establish a chemical compatibility verification protocol before introducing any new fluids or cleaning agents into the system, and use protective coatings or barriers where exposure is unavoidable.

Compliance & Manufacturing Standards

Reference Standards
ISO 10993-1: Biological evaluation of medical devices ASTM D2000: Standard Classification System for Rubber Products CE EN 455: Medical gloves for single use
Manufacturing Precision
  • Dimensional tolerance: +/-0.05mm for critical features
  • Hardness tolerance: +/-5 Shore A
Quality Inspection
  • Tensile strength and elongation test
  • Biocompatibility testing (cytotoxicity, sensitization, irritation)

Factories Producing Liquid Silicone Rubber

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

Supply Chain Commonly Integrated Components

Insulated Heating Chamber

A thermally insulated enclosure designed to uniformly heat molds to precise temperatures before coating application.

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Mold Conveyor System

A mechanical system that transports molds through the automated preheating and coating process

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Spray Manipulator

A robotic arm component within an automated mold spraying system that precisely positions and moves spray nozzles to apply release agents or cooling fluids onto mold surfaces.

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Cooling Unit

A component within an Automated Mold Spraying and Cooling System responsible for rapidly reducing mold temperature after spraying operations.

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Frequently Asked Questions

What are the typical cure temperature and time for this liquid silicone rubber?

This platinum-catalyzed LSR typically cures at elevated temperatures (specific °C varies by formulation) within seconds to minutes, depending on part thickness and mold design.

What mechanical properties can I expect from cured parts?

Cured parts offer excellent flexibility with high elongation at break, adjustable Shore A hardness, strong tensile and tear strength, and low specific gravity for lightweight applications.

How should I store and handle the two-part components?

Store Part A (base polymer) and Part B (cross-linker) separately in sealed containers at room temperature. Mix in precise ratios just before use to prevent premature curing.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Rubber and Plastic Product Manufacturing.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

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