Silicone Rubber Raw Material Property – Complete Technical Introduction
Silicone Rubber Raw Material Property – Complete Technical Introduction
1. Basic Chemical Structure of Silicone Rubber Raw Material
Silicone rubber raw material is a high-molecular elastomer based on polysiloxane main chain with Si-O-Si chemical bonds, different from carbon-carbon chains of natural rubber and synthetic organic rubber. The stable silicon-oxygen molecular structure is the root of all premium raw material properties of silicone rubber. Standard raw material molecular formula is [R₂Si-O]ₙ, where R groups include methyl, vinyl, phenyl, fluorinated groups to adjust raw material performance for different industrial demands.
Our factory supplies HTV solid silicone rubber raw material, LSR liquid silicone rubber raw material, and RTV room temperature vulcanized silicone raw material with adjustable molecular weight and viscosity from low flow liquid to high elasticity solid gum stock.
2. Outstanding Temperature Resistance Properties
Temperature tolerance is the most iconic property of silicone rubber raw material, far exceeding nitrile, EPDM, neoprene rubber raw materials.
- Continuous working temperature range: -60°C ~ 230°C for general silicone raw stock
- Low-temperature performance: No brittle cracking at -70°C, maintains stable elasticity without hardening
- High-temperature stability: No melting, low volatile loss, slow aging under long-term high heat
- Special modified silicone raw material can reach short-term 280°C high temperature resistance for oven, automotive engine sealing parts
This property makes silicone rubber raw material the top choice for high & low temperature sealing components in aerospace, automotive, home appliances.
3. Mechanical Properties of Silicone Rubber Raw Stock
All mechanical indicators of silicone rubber raw material can be customized via filler formula adjustment:
- Hardness range: 10 Shore A ~ 80 Shore A, ultra-soft gel to rigid industrial silicone stock available
- Tensile strength: 5–11 MPa, high tear resistance grade raw material avoids crack under repeated stretching
- Elongation at break: 300% ~ 800%, excellent elastic recovery, low compression set after long compression
- Wear resistance: Custom reinforced silicone raw material with silica filler improves friction service life
- Processing rheology: Stable viscosity raw material for extrusion, compression molding, injection molding
4. Chemical & Weather Aging Resistance Performance
Silicone rubber raw material features strong inert chemical properties and anti-aging performance:
- Ozone & UV resistance: No cracking or discoloration under long outdoor sunlight and ozone exposure, service life over 10 years outdoors
- Water & steam resistance: Hydrophobic surface, stable performance under high-pressure hot steam sterilization
- Chemical medium resistance: Resist weak acid, weak alkali, salt water, alcohol; fluorosilicone raw material improves oil, fuel and solvent resistance
- Oxidation resistance: Slow oxidative degradation under high temperature, no toxic decomposition substances
5. Superior Electrical Insulation Properties
Silicone rubber raw material is widely used as insulating raw material for electronics due to stable dielectric properties:
- Excellent volume resistivity and breakdown voltage, insulation performance unchanged under high & low temperature
- Low dielectric loss, anti-corona, anti-arc performance
- Moisture-proof insulation, will not short circuit under humid environmentSuitable for wire cable insulation, electronic potting, electrical gasket raw materials.
6. Food-Grade & Medical Safe Physiological Properties
Food contact and medical silicone rubber raw material adopts non-toxic pure silica filler without plasticizer:
- Tasteless, odorless, non-volatile, no harmful substance precipitation
- Physiologically inert, no irritation to human skin and tissue
- Pass FDA, LFGB, RoHS, medical biocompatibility testCan be vulcanized into baby products, food baking accessories, medical tube, infusion sealing parts.
7. Other Special Functional Characteristics
- Flame retardant property: Add flame retardant filler to produce fire-resistant silicone raw material, low smoke non-toxic burning
- Transparency: High-purity silicone rubber raw material achieves ultra-clear transparent appearance
- Anti-stick surface: Natural non-adhesive property, easy demolding during molding
- Color customizable: Match Pantone color with food-grade color masterbatch for raw material
- Low friction: Self-lubricating silicone raw material for sliding sealing rings
8. Common Silicone Rubber Raw Material Types & Formulations
Based on curing and processing method, our silicone rubber raw material falls into 3 core categories:
- HTV High Temperature Vulcanized Silicone Raw Material (Solid Silicone Gum)General purpose, high tear, food grade, medical grade, flame retardant, fluorosilicone raw stock for compression & extrusion
- LSR Liquid Silicone Rubber Raw MaterialTwo-component injection molding silicone raw material, high transparency, high precision auto & medical parts production
- RTV Room Temperature Vulcanized Silicone Raw MaterialOne-component & two-component silicone raw material for potting, coating, manual mold making without heating
9. Main Application Scenarios Based on Raw Material Properties
Matching silicone rubber raw material performance to downstream industries:
- Automotive: Engine gaskets, weather strip, cable insulation (high temperature & anti-aging raw material)
- Medical & Food: Silicone tube, silicone sealing gaskets, kitchen molds (FDA safe raw stock)
- Electronics: Wire insulation, potting glue, waterproof gaskets (insulation silicone raw material)
- Aerospace & Industrial Equipment: Extreme temperature silicone rubber seals , shock absorption pads
- Consumer Goods: Baby pacifiers, silicone kitchenware, outdoor waterproof accessories
10. Custom Silicone Rubber Raw Material Solutions From Our Factory
As professional silicone rubber raw material manufacturer, we tailor raw material formulas according to your required property parameters:
- Adjust hardness, temperature resistance, tensile strength, tear strength as your technical drawing
- Supply food, medical, flame retardant, fluorosilicone modified silicone raw material
- Support small batch test samples & bulk mass production
- Provide complete raw material property test report for engineering referenceContact us to get silicone rubber raw material data sheet and free samples.
