Compound
Silicone
■ KTseal fluorosilicone Compound:
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| KTseal mixture | Hardness | Color | Description |
|---|---|---|---|
| SI40 | 40 | Red | General purpose; AMS3301; relatively good heat resistance. |
| SI40 GY | 40 | Grey | General purpose |
| SI50 | 50 | Red | General purpose; AMS3302; relatively good heat resistance. |
| SI60 | 60 | Red | General purpose; AMS3302; relatively good heat resistance. |
| SI70 | 70 | Red | General purpose; AMS 3304; ZZ-R-765E Class 2a , 2b Grade 70; relatively good heat resistance. |
| SI70 CL | 70 | Transparent | General purpose; certified by FDA Food and Drug Administration. |
| SI70 WH | 70 | White | General purpose; certified by FDA Food and Drug Administration; relatively good heat resistance. |
| SI105 | 70 | Yellow | General purpose, low compression set. |
| SI80 | 80 | Red | General purpose; AMS3305; good heat resistance. |
| SI301 | 50 | White | Semiconductor, aerospace; resistance to high temperature. |
| SI317 | 70 | White | Semiconductor, aerospace; resistance to high temperature. |
| SI310 | 70 | Red | Semiconductor, aerospace; resistance to high temperature. |
| SI315 | 75 | Red | Semiconductor, aerospace; 7276; low compression set at high temperature. |
| SI312 | 40 | Red | Semiconductor, aerospace; low temperature; ZZ-R-765 Class 1a,1b Grade 40. |
| SI314 | 50 | Red | Semiconductor, aerospace; low temperature; ZZ-R-765 Class 1a,1b Grade 50. |
| SI333 | 60 | Red | Semiconductor, aerospace; low temperature; ZZ-R-765 Class 1a,1b Grade 60. |
| SI313 | 70 | Red | Semiconductor, aerospace; low temperature; ZZ-R-765 Class 1a,1b Grade 60. |
| SI450 | 50 | Red | Silicone for general purpose. |
| SI470 | 70 | Red | Silicone for general purpose. |
※ A=Best B= Common C=Poor D= Not recommended
| Fluorosilicone(FVMQ) O-Ring | |
|---|---|
| Silicone (VMQ) O-Ring | |
| Common name or commodity | Silicone |
| Chemical name | Polysiloxance |
| ASTM D1418 Nomenclature | VMQ,PVMQMQ,PMQ |
| ASTM D2000 SAEJ200 Type. class | FC,FE,GE |
| Material properties | |
| Density (gm/cm3) | 1.1-1.6 |
| Hardness range (Shore A) | 28-80 |
| Gas permeability | D |
| Electrical resistance | A |
| Odor | B |
| Taste | B |
| Stain resistance | A |
| Stickiness | B-A |
| Mechanical properties | |
| Tensile strength (max psi) | 600-1,500 |
| Friction resistance | C-B |
| Deflection resistance | C-B |
| Tearing resistance | C-B |
| Impact resistance | D-C |
| Deformability | A |
| Elasticity | B-A |
| Rebound resilience | D-A |
| Stress relief | C-A |
| Thermal properties | |
|---|---|
| Recommended max. application temperature (℃) | 175-230 |
| Low-temperature toughness | A |
| Thermal aging resistance | A |
| Flame resistance | A |
| Resistance to following elements | |
| Weather | A |
| Oxygen | A |
| Ozone | A |
| Radiation | C-B |
| Water | A |
| Vapor | C-B |
| Alkali (dil/conc) | A/A |
| Acid (dil/conc) | B/C |
| Oil, gasoline, kerosene | D-C |
| Benzene, hydrocarbon water | NR |
| Animal and vegetable oil | A |
| Oxidizing solvent | B-C |
| HALOGEN solvent | NR |
| Alcohol | B-C |
| Synthetic lubricating oil | NR |
| Hydraulic circulation: | |
| Silicate | D |
| Phosphate | B |
■ 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.
