Silicone & Rubber Materials Guide
Comprehensive material comparison for HTV, LSR, EPDM, NBR, FKM, CR — hardness, temperature, chemical resistance, and compliance
| Material | Type | Hardness (Shore A) | Temp Range | Key Features | Certifications | Best For |
|---|---|---|---|---|---|---|
| HTV Silicone | High-Temp Vulcanizing | 20-80 | -60°C to +250°C | Excellent heat resistance, biocompatible | FDA, LFGB, USP Class VI | Medical, Food, Automotive |
| LSR | Liquid Silicone Rubber | 30-70 | -50°C to +200°C | High precision, Class 100 cleanroom | ISO 13485, FDA, USP | Medical devices, Precision |
| EPDM | Ethylene Propylene Diene | 40-90 | -50°C to +150°C | Weather/ozone/UV resistant | FDA, NSF 61, WRAS | Automotive, Construction |
| NBR | Nitrile Butadiene Rubber | 40-90 | -30°C to +120°C | Oil & fuel resistant | – | Oil seals, Gaskets |
| FKM | Fluoroelastomer (Viton) | 55-90 | -20°C to +250°C | Chemical & high-temp resistant | – | Aerospace, Chemical, Oil&Gas |
| CR | Chloroprene (Neoprene) | 40-80 | -40°C to +120°C | Weather & flame resistant | – | Marine, Electrical |
HTV Silicone
HTV silicone requires high-temperature vulcanization, offering excellent heat resistance and biocompatibility.
- Hardness: Shore A 20-80
- Temperature Range: -60°C to +250°C
- Certifications: FDA, LFGB, USP Class VI
- Process: Compression molding
LSR (Liquid Silicone Rubber)
Two-component liquid silicone injected into heated mold, superior precision to ±0.05mm.
- Hardness: Shore A 30-70
- Temperature Range: -50°C to +200°C
- Certifications: ISO 13485, Class 100 cleanroom
- Process: LSR injection molding
EPDM
Synthetic rubber with exceptional weather and ozone resistance for outdoor durability.
- Hardness: Shore A 40-90
- Temperature Range: -50°C to +150°C
- Certifications: FDA, NSF 61, WRAS
- Process: Compression molding
NBR (Nitrile Butadiene Rubber)
Workhorse rubber for oil and fuel resistance. ACN content determines oil resistance level.
- Hardness: Shore A 40-90
- Temperature Range: -30°C to +120°C
- Resistance: Oil & fuel resistant
- Process: Compression molding
FKM (Fluoroelastomer / Viton)
Best combination of high-temperature and chemical resistance among all rubbers.
- Hardness: Shore A 55-90
- Temperature Range: -20°C to +250°C
- Resistance: Chemical, acid, solvent resistant
- Process: Compression molding
CR (Chloroprene / Neoprene)
Balanced weather resistance, flame retardancy, and moderate oil resistance.
- Hardness: Shore A 40-80
- Temperature Range: -40°C to +120°C
- Resistance: Weather, ozone, flame resistant
- Process: Compression molding
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