Best for very wide temperature and ozone/UV/dry-heat exposure.
Great flexibility at low temps; not for fuels or abrasive/dynamic service.
| Feature | Details |
|---|---|
| Also called | MQ, VMQ, PVMQ (phenyl-modified) |
| Typical service temp | –60°F to +400°F (short-term to ~450°F by compound) |
| Hardness range | 20–80 Shore A (common: 50/60/70/75) |
| Cure systems | Peroxide (standard) • Platinum (very low volatiles; medical/pharma) |
| Options | FDA/USP VI, metal/X-ray detectable, wide color range |
| Actual limits vary by compound and media—verify in your service conditions. | |
BEST FOR
- ✔ Need excellent low-temperature flexibility and high-temp / dry-heat performance
- ✔ Ozone/UV/weather resistance; outdoor enclosures, lighting, HVAC
- ✔ Food/medical/pharma (platinum-cured, low extractables)
- ✔ Electrical insulation and color-coding
Not For
- ✘ Fuels & most petroleum oils (swelling)
- ✘ Superheated steam / long-term hot water above ~248°F (120°C)
- ✘ Concentrated acids/alkalis, aromatic hydrocarbons, ketones
- ✘ Dynamic/abrasive service (low tear & wear resistance)
Popular Silicone Options
- General Purpose: 50–75A (red/blue/black)
- Platinum-Cured / USP Class VI: 70A clear (low volatiles)
- FDA-Grade selections (multiple colors)
- Metal/X-Ray Detectable options
- Inch (AS568) and metric sizes; customs and colors on request
Inch (AS568) and metric sizes. Custom sizes and colors on request.
Engineering Notes
- Base chemistry: silicone backbone with methyl/phenyl/vinyl side groups; PVMQ (phenyl) improves low-temp performance.
- Peroxide vs Platinum: platinum-cured compounds exhibit very low extractables and excellent flexibility—preferred for medical/pharma; peroxide is the standard industrial cure.
- Silicone offers excellent dielectric properties, but low tensile/tear—favor static over dynamic sealing.
- Applications:
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Static seals & gaskets • Food & beverage lines • Medical devices • Electronics & lighting • HVAC • Aerospace/automotive static seals.
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