Introduce the performance and working environment of various rubber sealing strips。
EPDM rubber sealing strip: it has good weather resistance, ozone proof, water resistance and chemical resistance. It can be used for alcohol and ketone, and can also be used for sealing in high temperature water vapor environment. Suitable limitations: suitable for bathroom building, automobile radiator and automobile brake system. It is not used for food or exposed to mineral oil. Generally, the application temperature is limited to-55 ~ 32℃.
Silicone rubber (SIL) sealing strip: it has good heat resistance, cold resistance, ozone proof resistance and atmospheric aging resistance. It has good insulation performance. But the tensile strength is worse than that of ordinary rubber and it has no oil resistance. Suitable limitations: suitable for household appliances such as electric water heater, electric iron, microwave oven, etc. It is also suitable for all kinds of supplies that have war with human body, such as water jug and water dispenser. It is not initiated and applied to most concentrated solvents, oil products, concentrated acids and sodium hydroxide. Generally, the application temperature is limited to-55 ~ 32℃.
NBR nitrile rubber seal strip is a rubber seal with wide usage and low cost at present. Suitable limitations: suitable for kerosene hydraulic oil, glycol hydraulic oil, Diester greasy oil, gasoline, water, Silicon greasy grease, silicone oil and other media applications. It is not suitable for sexual solvents, such as ketones, ozone, nitrohydrocarbon, MEK and trichlorides. Generally, the application temperature is limited to-40 ~ 32℃.
NR natural rubber sealing strip: it has good wear resistance, elasticity, tensile strength and elongation. But it is easy to age in the atmosphere, become sticky when exposed to heat, shrink and melt easily in mineral oil or gasoline, resist alkali but not strong acid. Suitable limitations: suitable for application in automotive brake fluid, ethanol and other liquids with hydroxide ions. Generally, the application temperature is limited to-20 ~ 32℃.
PU polyurethane rubber sealing strip: polyurethane rubber has good mechanical properties, and its wear resistance and high pressure resistance are far better than other rubber. Aging resistance, ozone proof resistance and oil resistance also match well, but it is easy to hydrolyze at high temperature. Suitable limitations: generally used in high pressure resistant and wear resistant sealing links, such as hydraulic cylinders. Generally, the application temperature is limited to-45 ~ 90℃.