How to select appropriate O-ring

How to select appropriate O-ring

In the market, there are three kinds of typical material for o-ring:

NBR, VMQ(SILICONE), FKM.

Below is their characteristic：

Performance characteristics: oil resistance, heat resistance, wear resistance, solvent resistance and high pressure oil resistance. But it is not suitable for polar solution, such as copper, ozone, nitrohydrocarbon;

Application field: it is commonly used in fuel tank, lubricating oil tank, petroleum hydraulic oil, gasoline, glycol hydraulic oil, di grease lubricating oil, water, silicone grease, silicone oil and other media;

Working temperature: - 40 ~ + 120 ° C, common color: black (shore A55degree)

Performance characteristics: environmental protection, non-toxic, good elasticity, heat, cold, ozone, atmospheric aging resistance, good insulation. It is not recommended to be used in most concentrated solvent, oil, concentrated acid and sodium hydroxide;

Application: sealing of commonly used electronic, medical, household appliances, food machinery and articles in contact with human body

Working temperature: - 60 ~ + 220 ° C, common colors: iron red, white, translucent, black

(shore A55degree)

Performance characteristics: it has good weather resistance, ozone resistance and chemical resistance. It has resistance to most oil products and solvents, especially acids, aliphatic hydrocarbons, aromatic hydrocarbons, animal and vegetable oils. It is not recommended for ketones, low molecular weight esters and mixtures containing nitrate, which has poor cold resistance

Application field: it is commonly used in the working environment of high temperature resistance, chemical corrosion resistance and oil resistance. It is widely used in metallurgy, chemical industry, automobile, electric power and other industries.

Working temperature: - 20 ~ + 250 ° C, common color: green, brown, hardness 75 degrees