Editorial Technical Reference

Fumed Silicone Rubber

This page explains how Fumed 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 high-performance silicone rubber reinforced with fumed silica, offering enhanced mechanical strength and thermal stability.

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Product Specifications

Technical details and manufacturing context for Fumed Silicone Rubber

Definition
Fumed silicone rubber is an advanced elastomeric material produced by incorporating fumed silica (pyrogenic silica) into a silicone polymer matrix. This reinforcement creates a three-dimensional network that significantly improves tensile strength, tear resistance, compression set, and thermal stability compared to conventional silicone rubbers. The material exhibits excellent resistance to extreme temperatures (-60°C to +250°C), weathering, ozone, and many chemicals while maintaining flexibility and electrical insulation properties. It is commonly used in applications requiring durable sealing, gasketing, and insulation in demanding environments. The material's performance is characterized by parameters such as hardness (40–80 Shore A), tensile strength (8–12 MPa), elongation at break (400–700%), tear strength (20–40 kN/m), compression set (10–30%), operating temperature range (-60°C to 200°C), specific gravity (1.1–1.3 g/cm³), dielectric strength (15–25 kV/mm), volume resistivity (10^14–10^16 Ω·cm), water absorption (0.1–0.5%), thermal conductivity (0.2–0.3 W/(m·K)), and excellent UV resistance. These values are typical ranges and must be verified for specific products. The material is manufactured using silicone polymer (polydimethylsiloxane), fumed silica, crosslinking agents, and catalysts. Standards such as ISO 7619-1, ISO 37, ISO 34-1, ISO 815-1, ISO 188, ISO 2781, IEC 60243-1, IEC 60093, ISO 62, ISO 22007-2, and ISO 4892-3 are referenced for testing and verification. Always confirm model-specific values and compliance with the legal manufacturer or supplier.
Working Principle
Fumed silica nanoparticles are dispersed throughout the silicone polymer matrix during manufacturing, creating a reinforcing network through hydrogen bonding and physical entanglement. This network distributes mechanical stress efficiently, preventing crack propagation and deformation. The high surface area of fumed silica (typically 200-400 m²/g) provides extensive interaction with silicone chains, improving mechanical properties without significantly affecting flexibility or processability.
Common Materials
Silicone Polymer (Polydimethylsiloxane), Fumed Silica (Pyrogenic Silica), Crosslinking Agents, Catalysts
Technical Parameters
ParameterTypical rangeNotes & selection driver
HardnessRequired40–80 Shore ADurometer measurement of material hardness on Shore A scaleISO 7619-1
Tensile StrengthRequired8–12 MPaMaximum stress material can withstand while being stretched before breakingISO 37
Elongation at BreakRequired400–700 %Percentage increase in length before material breaks under tensionISO 37
Tear StrengthRequired20–40 kN/mResistance to growth of cuts or nicks under tensionISO 34-1
Compression SetRequired10–30 %Percentage of permanent deformation after compression releaseISO 815-1
Operating Temperature RangeRequired-60–200 °CContinuous service temperature rangeISO 188
Specific GravityRequired1.1–1.3 g/cm³Density relative to water at 4°CISO 2781
Dielectric Strength15–25 kV/mmElectrical insulation propertyIEC 60243-1
Volume Resistivity10^14–10^16 Ω·cmHigh electrical resistanceIEC 60093
Water Absorption0.1–0.5 %Low water uptake for stabilityISO 62
Thermal Conductivity0.2–0.3 W/(m·K)Typical for silicone rubberISO 22007-2
UV ResistanceExcellentNo significant degradation after 1000hISO 4892-3

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
  • Silicone Polymer Base Part
    Primary elastomeric matrix providing flexibility and chemical resistance
    Material: Polydimethylsiloxane (PDMS) with vinyl or methyl groups
  • Fumed Silica Reinforcement Part
    Nanoparticle filler creating reinforcing network for mechanical strength
    Material: Pyrogenic silica with high surface area (200-400 m²/g)
  • Crosslinking System Part
    Forms covalent bonds between polymer chains for curing
    Material: Peroxide or platinum catalyst with hydrosilane crosslinkers
  • Processing Aids Part
    Improves mold release, flow characteristics, and processing
    Material: Internal mold release agents and flow modifiers
  • Pigments and Colorants Part
    Provides coloration for identification and aesthetic purposes
    Material: Heat-stable inorganic pigments or organic colorants

Industry Taxonomies & Aliases

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

Fumed Silica Reinforced Silicone Rubber Reinforced Silicone Elastomer Pyrogenic Silica Silicone Rubber High-Strength 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 geometry and reinforcement
flow rate: Not applicable (solid elastomer)
temperature: -60°C to +250°C continuous, up to +300°C intermittent
Media Compatibility
✓ High-temperature air/gas systems ✓ Chemical processing equipment seals ✓ Electrical insulation applications
Unsuitable: Concentrated strong acids or bases (e.g., sulfuric acid, sodium hydroxide)
Sizing Data Required
  • Required hardness (Shore A scale)
  • Application temperature profile (min/max/cyclic)
  • Mechanical load/stress requirements

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Thermal degradation
Cause: Exposure to temperatures exceeding the material's continuous service limit (typically 200-250°C for fumed silicone rubber), causing polymer chain scission, loss of elasticity, and embrittlement.
Chemical attack/swelling
Cause: Contact with incompatible chemicals such as concentrated acids, bases, solvents, or oils that penetrate the polymer matrix, causing swelling, softening, or dissolution of the fumed silica reinforcement network.
Maintenance Indicators
  • Visible surface cracking or crazing indicating material embrittlement
  • Abnormal hardening or softening of the material compared to its original state
Engineering Tips
  • Implement temperature monitoring and control systems to ensure operation within the material's specified thermal range, particularly in high-heat applications like gaskets or seals in thermal processing equipment.
  • Establish chemical compatibility protocols including material selection guides and barrier protection (e.g., secondary containment or coatings) when exposure to aggressive chemicals 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
ASTM D2000 - Standard Classification System for Rubber Products DIN 53504 - Testing of Rubber; Determination of Tensile Strength at Break

Quoted from the published standard.

Manufacturing Precision
  • Hardness: +/- 5 Shore A
  • Thickness: +/- 0.2mm
Quality Inspection
  • Hardness Test (Shore A)
  • Tensile Strength Test

Manufacturers of Fumed Silicone Rubber

Manufacturer profiles associated with Fumed Silicone Rubber.

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Supply Chain Commonly Integrated Components

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 fumed silicone rubber used for?

Fumed silicone rubber is used in applications requiring durable sealing, gasketing, and electrical insulation, especially in extreme temperatures and harsh environments.

How does fumed silica reinforcement improve silicone rubber?

Fumed silica creates a reinforcing network that enhances tensile strength, tear resistance, and compression set, while maintaining flexibility and thermal stability.

What temperature range can fumed silicone rubber withstand?

The typical continuous operating temperature range is -60°C to +200°C, with short-term exposure up to +250°C, but always verify with the manufacturer.

What standards apply to fumed silicone rubber testing?

Common standards include ISO 7619-1 for hardness, ISO 37 for tensile and elongation, ISO 34-1 for tear strength, and IEC 60243-1 for dielectric strength. Confirm applicable standards with the supplier.
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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