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■ 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 commodityFluorosilicone
Chemical nameFluoro vinyl Methyl siloxane
ASTM D1418 Nomenclature--→FVMQ
ASTM D2000 SAEJ200→
Type. class    
Material properties
Density (gm/cm3)1.4
Hardness range (Shore A)40-80
Gas permeabilityD
Electrical resistanceA
Stain resistanceA
Mechanical properties
Tensile strength (max psi)1,200
Friction resistanceD
Deflection resistanceD
Tearing resistanceD
Impact resistanceD
Rebound resilienceC
Stress reliefB
Thermal properties
Recommended max. application temperature (℃)200
Low-temperature toughnessD
Thermal aging resistanceA
Flame resistanceA
Resistance to following elements
Alkali (dil/conc)B/C
Acid (dil/conc)A/A
Oil, gasoline, keroseneA
Benzene, hydrocarbon waterA
Animal and vegetable oilA
Oxidizing solventnr
HALOGEN solventA
Synthetic lubricating oilA
Hydraulic circulation: 

■ Note

  1. 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.
  2. Sometimes the tensile strength is not important, but unchanged tensile strength during temperature rise means other mechanical properties can also remain unchanged.
  3. There is a wide range of temperature and friction mode for friction resistant application (e.g. scraping and colliding).
  4. High fracture resistance means good durability, and such property is required when physical abuse is expected.
  5. When physical abuse is expected to occur, tearing resistance must be accompanied by fracture resistance.
  6. During strong deformation, only stress-induced crystallization rubber has good durability, and low temperature curvature can also help to improve the impact resistance.
  7. Generally, high deformability means high fatigue resistance under deflection state.
  8. The less the permanent deformation, the better the structural integrity, the more it can maintain its original size.
  9. The better the elasticity, the less the internal heat increase in deflection or dynamic condition.
  10. The better the creep resistance, the longer the service life of products (especially when the product clearance must be kept constant).
  11. Stress relief is necessary for sealing or other frequently stressed products.
  12. For most of vibration buffering devices, good low temperature flexibility is necessary, and the initial swing and subsequent softness are more important.
  13. 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.