Analysis of O-ring materials, properties and applications |

O-ring is a rubber ring with a circular interface, because of its O-type cross section, it is called O-ring, also known as O-ring. It began to appear in the mid-19th century, when it was used as a sealing element for steam engine cylinders. It is one of the most widely used hydraulic and pneumatic transmission systems. Usually in Taiwan, Japanese companies called O-Ring.

Common rubber materials and their temperature ranges are as follows:

· Nitrile butadiene rubber (NBR)

· Temperature range: -30~100℃

· Nitrile rubber has good resistance to oil and fuel, and is widely used in automotive and mechanical seals

· Fluororubber (FKM)

· Temperature range: -20~200℃

· Fluororubber has good high temperature resistance and strong chemical corrosion resistance, which is suitable for sealing in high temperature environment, such as aerospace and chemical industry

· Silicone Rubber (VMQ)

· Temperature range: -60~200℃

Silicone rubber has several low temperature resistance, but also can withstand higher temperatures, widely used in food, medical, electronics and other industries

(一)    Hardness:

The hardness of rubber O-rings is usually measured by Shore A hardness, and the hardness range is generally between 30A and 90A.

(二)    Color:

Black, brown, green, red, pink, blue, gray, orange, can be specified according to customer needs

(三)    Principles of formula design:

The rubber formula is generally composed of raw rubber, vulcanized antioxidant reinforcing agent system, protection system, reinforcing system and softening system. The purpose of formulation design is to seek the best combination of various matching components, so as to obtain good comprehensive performance. The final goal is as follows:

1. Compact structure, easy to disassemble

2. Static and dynamic seals can be used

3. The dynamic friction resistance is relatively small

4. Meet the performance requirements of the sealing ring

5. Good processing performance of rubber material