Compound
Fluorosilicone
■ KTseal fluorosilicone Compound:
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| KTseal mixture | Hardness | Color | Description |
|---|---|---|---|
| F50 | 50 | Blue | General purpose |
| F60 | 60 | Blue | General purpose MIL-R-25988 Type 1 Class 1 Grade 60 |
| F70 | 70 | Blue | General purpose MIL-R-25988 Type 1 Class 1 Grade 70 |
| F75 | 75 | Blue | General purpose MIL-R-25988 Type 1 Class 3 Grade 75 |
| F80 | 80 | Blue | General purpose MIL-R-25988 Type 1 Class 1 Grade 80 |
| F217 | 75 | Blue | The fluorosilicone of high modulus coefficient is ideal for fuel oil application. |
※ A=Best B= Common C=Poor D= Not recommended
| Fluorosilicone (FVMQ) O-Ring | |
|---|---|
| Common name or commodity | Fluorosilicone |
| Chemical name | Fluoro vinyl Methyl siloxane |
| ASTM D1418 Nomenclature--→ | FVMQ |
| ASTM D2000 SAEJ200→ Type. class | FK |
| Material properties | |
| Density (gm/cm3) | 1.4 |
| Hardness range (Shore A) | 40-80 |
| Gas permeability | D |
| Electrical resistance | A |
| Odor | B |
| Taste | B |
| Stain resistance | A |
| Stickiness | B-A |
| Mechanical properties | |
| Tensile strength (max psi) | 1,200 |
| Friction resistance | D |
| Deflection resistance | D |
| Tearing resistance | D |
| Impact resistance | D |
| Deformability | C |
| Elasticity | C-B |
| Rebound resilience | C |
| Stress relief | B |
| Thermal properties | |
|---|---|
| Recommended max. application temperature (℃) | 200 |
| Low-temperature toughness | D |
| Thermal aging resistance | A |
| Flame resistance | A |
| Resistance to following elements | |
| Weather | A |
| Oxygen | A |
| Ozone | A |
| Radiation | C-B |
| Water | A |
| Vapor | B |
| Alkali (dil/conc) | B/C |
| Acid (dil/conc) | A/A |
| Oil, gasoline, kerosene | A |
| Benzene, hydrocarbon water | A |
| Animal and vegetable oil | A |
| Oxidizing solvent | nr |
| HALOGEN solvent | A |
| Alcohol | C-A |
| Synthetic lubricating oil | A |
| Hydraulic circulation: | |
| Silicate | C |
| Phosphate | D |
■ Note
- The higher the density, the more rubber material used. For example: although the unit price of neoprene is the same with natural rubber, but it's actually still very expensive.
- Sometimes the tensile strength is not important, but unchanged tensile strength during temperature rise means other mechanical properties can also remain unchanged.
- There is a wide range of temperature and friction mode for friction resistant application (e.g. scraping and colliding).
- High fracture resistance means good durability, and such property is required when physical abuse is expected.
- When physical abuse is expected to occur, tearing resistance must be accompanied by fracture resistance.
- During strong deformation, only stress-induced crystallization rubber has good durability, and low temperature curvature can also help to improve the impact resistance.
- Generally, high deformability means high fatigue resistance under deflection state.
- The less the permanent deformation, the better the structural integrity, the more it can maintain its original size.
- The better the elasticity, the less the internal heat increase in deflection or dynamic condition.
- The better the creep resistance, the longer the service life of products (especially when the product clearance must be kept constant).
- Stress relief is necessary for sealing or other frequently stressed products.
- For most of vibration buffering devices, good low temperature flexibility is necessary, and the initial swing and subsequent softness are more important.
- Oil resistance is the most important surface effect, and deterioration will not occur due to exposure in oil when the oil resistance is poor but volume is large enough.
