Editorial Technical Reference

Liquid Silicone Rubber

This page explains how Liquid Silicone Rubber is classified within Rubber and Plastic Product Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

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. LSR is supplied as two liquid components (Part A and Part B) that are precisely metered, mixed, and injected into a heated mold cavity. The heat activates the platinum catalyst, initiating a hydrosilylation addition reaction that cross-links the silicone polymer chains, curing the material without by-products. The cured rubber exhibits a hardness range of 20–70 Shore A (ISO 7619-1), mixed viscosity of 1000–100000 Pa·s (ISO 3219), tensile strength of 5–12 MPa (ISO 37), elongation at break of 300–700% (ISO 37), tear strength of 20–50 kN/m (ISO 34-1), and specific gravity of 1.10–1.20 g/cm³ (ISO 1183-1). Cure temperature typically ranges from 120–180°C with cure times of 1–10 seconds. The material operates continuously from -50°C to 200°C, with short peaks up to 250°C. Electrical properties include dielectric strength of 15–25 kV/mm (IEC 60243-1) and volume resistivity of 1e14–1e16 Ω·cm (IEC 60093). Linear shrinkage is 1.5–3.0% (ISO 294-4), and compression set is 10–30% (ISO 815-1). Available colors range from transparent to black, with custom colors on request. These values are typical ranges; verify model-specific data with the manufacturer.
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
ParameterTypical rangeNotes & selection driver
HardnessRequired20–70 Shore ADurometer measurement of the cured material's firmness.ISO 7619-1
Viscosity (Mixed)Required1000–100000 Pa·s (or cP)The flow resistance of the mixed, uncured material, critical for injection molding.ISO 3219
Tensile StrengthRequired5–12 MPaMaximum stress the cured material can withstand while being stretched before breaking.ISO 37
Elongation at BreakRequired300–700 %The percentage increase in length a cured sample achieves before rupture under tension.ISO 37
Tear StrengthRequired20–50 kN/mResistance to the growth of a cut or nick in the cured material.ISO 34-1
Cure TemperatureRequired120–180 °CThe mold temperature required to initiate and complete the vulcanization (curing) process.
Cure TimeRequired1–10 secondsThe duration the material must remain in the heated mold to achieve full cure.
Specific Gravity1.10–1.20 g/cm³The density of the cured material relative to water.ISO 1183-1
Operating Temperature Range-50–200 °CContinuous service; short peaks up to 250°C
Dielectric Strength15–25 kV/mmFor electrical insulation applicationsIEC 60243-1
Volume Resistivity1e14–1e16 Ω·cmHigh resistivity for electrical insulationIEC 60093
Linear Shrinkage1.5–3.0 %Affects mold design and dimensional accuracyISO 294-4
Compression Set10–30 %Lower is better for sealing performanceISO 815-1
ColorTransparent–BlackCustom colors available on request

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

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

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.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable 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

Quoted from the published standard.

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)

Manufacturers of Liquid Silicone Rubber

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Hangzhou Bright Rubber Plastic Product Co., Ltd.
Hangzhou, Zhejiang, CN
ISO 9001:2015 IATF 16949
Also makes: Silicone Rubber, Molded Rubber Part, Automotive Components and 3 more
Listed on the company's own website · profile compiled by CNFX from public sources
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Supply Chain Commonly Integrated Components

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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Infrared Heating Zone

A specialized heating section within an automated mold preparation station that uses infrared radiation to preheat molds to optimal processing temperatures.

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Frequently Asked Questions

What is the typical curing temperature and time for LSR?

Typical cure temperature ranges from 120°C to 180°C, with cure times of 1 to 10 seconds. These values depend on the specific formulation and part geometry; always confirm with the material supplier.

What hardness range is available for LSR?

The cured hardness typically ranges from 20 to 70 Shore A, measured per ISO 7619-1. The exact hardness depends on the formulation and can be tailored for specific applications.

Is LSR suitable for food contact or medical applications?

LSR is known for its biocompatibility and chemical resistance, but suitability for specific applications must be verified with the manufacturer, as certifications and compliance are not inherent.

How is LSR processed?

LSR is processed using liquid injection molding (LIM). The two liquid components are metered, mixed, and injected into a heated mold, where they cure rapidly. This process allows high-volume production of precise parts.
Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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