O-ring requirements for rubber material and characteristics of application range

Because of the sealing performance of the rubber o-ring, in order to obtain its good sealing performance, in addition to other strict requirements, the correct and reasonable selection of its material is also very important. The specific requirements for the rubber material of the O-ring are as follows:

1. Can resist the erosive effect of the medium (such as corrosion, swelling, dissolution, etc.).

2. Strong anti-aging and heat resistance, completely stable and reliable at working temperature.

3. Have good mechanical properties, especially should have good wear resistance.

4. The molding process performance is good, the material source is wide, and the price is low.

5 has good elasticity, certain hardness, and small compression deformation during its service life, which is very important for it to reduce leakage during operation and achieve good sealing performance.

6. Wide range of use.

Rubber is a material with high elasticity, which has the ability to recover from deformation, and can store a large amount of deformation energy, and can preserve excellent elasticity for a long time. Therefore, it has excellent elasticity and good mechanical properties necessary as a molding filler, as well as certain corrosion resistance, oil resistance and temperature resistance. Its structure is dense, easy to mold, and it is a good seal Structural materials. As far as sealing applications are concerned, due to the high temperature resistance, mineral oil resistance and poor corrosion resistance of natural rubber, it is generally not used as a sealing material for some special purposes. However, the development of synthetic rubber and its use in core sealing parts can be said to make up for the shortcomings of natural rubber to a large extent, and its easy molding makes it widely used in molding fillers. However, there are many varieties of rubber, and new types of rubber are constantly emerging. Users should understand their characteristics, prices, and sources in order to make reasonable choices.

Butadiene rubber (NIR): suitable for mineral oil, gasoline, benzene Temperature range static: -30-120℃ Features: Pay attention to use in sports

Urethane rubber (CR): suitable for air, water, oxygen Temperature range static: -30~-120℃ Features: large permanent deformation, not suitable for mineral oil

Butyl rubber (IR): suitable for animal. vegetable oil, acid, alkali temperature range static: -30~- 120℃ Features: not suitable for mineral oil

Butadiene rubber (SBR): suitable for alkali, animal, vegetable oil, water, air Temperature range static: -30-120℃ Features: not suitable for mineral oil

Natural rubber (NR): suitable for water, weak acid, alkali Temperature range static: -30-120℃ Features: not suitable for steam, avoid using it in moving parts

Silicone rubber (Si): suitable for high and low temperature oil, mineral oil. Animal and vegetable oil, oxygen, weak acid, weak base Temperature range static: -30-120℃ Features: Avoid using in sports parts

Chlorosulfonated polyethylene (CSM): suitable for high temperature oil, oxygen, ozone Temperature range static: -30-120℃ Features: wear-resistant to avoid high-speed use

Polytetrafluoroethylene (PTFE): suitable for acids, alkalis and various solvents Temperature range static: -30-120℃ Features: do not apply to moving parts