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Silicone rubber O-ring application and shortcomings and material selection considerations?

Release time:

2019-05-15 12:30

Source:

1. Application and disadvantages of silicone rubber O-ring
 
Silicone rubber O-ringIt is a ring-shaped product made of silicone rubber. It is a classification of silicone rubber products. Silicone rubber O-rings have good characteristics such as wide temperature adaptation, sealing, insulation, dielectric, and environmental protection.
 
Therefore, it can resist high temperature and low temperature, and has good characteristics in sealing performance and dielectric properties. Silicone rubber O-rings are commonly used to make various seals, high-voltage wires and cables, rubber tubes for high and low temperature silicone rubber products, etc. because silicone rubber O-rings have the non-toxic, colorless and tasteless characteristics of silicone rubber products, and silicone rubber O-rings are also used in food and medical industries.
 
The disadvantage of the silicone rubber O-ring is that the price is relatively expensive compared to other silicone rubber products, and the corrosion resistance is not as good as other silicone rubber products. It is slightly insufficient in acid, alkali and chemical solvent resistance. The strength is also relatively low.
2. StandardizationO-ringWhat are the selection considerations?
 
What is the structure of standardized O-ring? O-ring is a small cross-section of the ring-shaped sealing element, commonly used design section is circular.
 
O-type seals are mainly made of synthetic rubber, which is a common seal used in hydraulic engineering, mainly for static sealing and sliding sealing.
 
1. and seal ratio has the following characteristics:
1. O-ring dynamic friction resistance is small;
2. O-ring has good sealing performance and long service life;
3. O-ring sealing part has simple structure and convenient disassembly and assembly;
4, O-ring can do both static seal and dynamic seal;
5, a single ring can be sealed in two directions;
6. O-ring has good adaptability to oil, temperature and pressure;
7. Small size, light weight and low cost; standardized seal structure is convenient for selection and outsourcing; but the disadvantage of O-ring seal is that when the dynamic seal is started, the friction resistance is large, about 3~4 times the dynamic friction force, it is easy to be squeezed into the gap under high pressure.
 
Therefore, what are our considerations in the selection of standardized seal O-rings?
(1) Consider whether there is an impact load acting on the sealing part;
(2) Observe whether the working medium is gas or liquid, and consider the physical and chemical properties of the O-ring;
(3) The working temperature includes the instantaneous temperature and the temperature of alternating hot and cold;
(4) working pressure pressure size, fluctuation amplitude and frequency, as well as the instantaneous occurrence of higher pressure;
(5) Identify whether the working state of the O-ring is used for static seal, dynamic seal or sliding seal;
(6) Consider whether the mechanical equipment is working continuously or intermittently, and consider the length of each intermittent time;
(7) Understand the source of the sealing element material. According to the O-ring material selection to use normal engineering seal, generally speaking, NBR rubber is used for oil resistance; CR rubber is used for ozone resistance; ACM rubber or FKM rubber for heat resistance; PU polyurethane rubber is used for high pressure resistance and abrasion resistance S; Copolymer rubber for cold resistance and oil resistance, etc. Learn more about sealing issuesFamous vibration silicone products manufacturers networkOh! This article comes from network sharing.

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