Which Is Better, FFKM (perfluorocarbon Rubber) Or FLS (fluorosilicone Rubber)

FFKM (full fluorine rubber) fluoroplastic O -type O -type is very excellent chemical corrosion resistance, and most known chemicals such as acid, alkali, ketone, ester, ether, and strong itching agent. The highest heat resistance can reach 300 ° C. It is usually used to solve the sealing problem of complex environments. The price is nearly 100 times higher than that of ordinary rubber materials. It is very expensive. Of course, the sealing effect is good, and it can be used in a very strict environment and cannot be replaced. It is not suitable for the use of ketone, low molecular weight and mixtures containing nitrate. Normal use temperature range is -20 ℃ ~ 220 ℃
1. FLS (fluorine silicon rubber) fluoroplans O -type circles have the advantages of fluorine rubber and silicon rubber, and have good temperature in oil -resistant, solvent -resistant, fuel oil, and high and low resistance. The erosion of itching compounds, solvents containing aromatic hydrocarbons, and solvents containing chlorine -containing solvents. Can be used for aerospace and military purposes. Not suitable for exposure to ketones and brake oil. The temperature range is generally used -50 ℃ ~ 200 ℃.
2. EPDM (Sanyuanye Rubber) Fluoroplastic O -shaped ring has good weather resistance, odor resistance, water resistance, and chemical resistance. It is suitable for alcohol and ketones, and can also be used for sealing of high -temperature water vapor environments. It is suitable for bathroom equipment, car radiator and car brake system. Not suitable for food use or exposed to mineral oil. Generally, the temperature range is -55 ℃ ~ 150 ℃
3.CR (choride rubber) fluoride O -type O -shaped ring resistance to the sun and excellent weather. It can be used in refrigerants such as dichloro fluorine methane and ammonia. It is diluted and silicon -resistant lubricating oil, but has a large amount of expansion in the low mineral oil with low aniline. It is easy to crystallize and harden at low temperature. It can be suitable for various seals that are exposed to atmosphere, sunlight, itching, and various flame -resistant and chemical corrosion seals. Not suitable for chemicals of strong acid, nitrate, ester, chloroform and ketone. Generally, the temperature range is -55 ° C ~ 120 ° C.
4.IIR (butyl rubber) fluoroplastic O -type O -type has excellent gas tightness, heat resistance, sunlight, and good odor resistance, good insulation performance; good resistance to polar solvents such as alcohol, ketone, ester, etc. Ability can be exposed to animal and plant oil or itching.