A high elasticity import O-ring
We know that the sealing ring is deformed and principle depend on external back seal. Rubber elastic quality and tensile strength quality is one of the very important index to measure the quality of imported o-ring. Taiwan asmall sealed XOK is made of imported rubber and advanced production technology to ensure the high elasticity and excellent tensile strength of the sealing ring. The elasticity of rubber is usually expressed by the rebound rate, and sometimes it can be expressed by the elongation and permanent deformation; the material of the imported O-ring has large elongation, small permanent deformation and large elasticity. High elasticity is mainly related to molecular weight, conformational entropy of crimp molecules, crosslinking density of vulcanizate and type of crosslinking bond. The large molecular weight of rubber is beneficial to the improvement of elasticity. Moderate crosslinking can reduce or eliminate the slip between molecular chains, which is conducive to the improvement of elasticity. Moreover, the polysulfide bond is smaller, and the kinetic force of molecular chain is smaller.
Two, imported silicone O-ring aging factors and development trend of SIL products
Silicone products aging resistance itself is very good. Better aging resistance is more or less affected by long-term use and external factors.
1/ aging factor
A, internal factors: mainly rubber types, molding methods, bonding degree, the type of drugs, factors in processing engineering, etc.
B, external factors: ozone, oxygen, oxide, heat, light, radiation, mechanical fatigue, lack of processing and so on.
The development trend of 2/
Silicone rubber is a rubber elastomer with a certain strength and elongation. As a good medical polymer material, silicone rubber has attracted more and more attention both in the rubber industry and in the medical field. The silicone rubber, which is used as a medical material, has a series of excellent properties such as non-toxic, tasteless and non carcinogenic. Besides, it has the characteristics of stable performance, temperature resistance, oxidation resistance, high hydrophobicity, softness, permeability, high transparency of aging resistance, no adhesion to human body and blood, and good biological adaptability. Therefore, medical silicone rubber products are more and more used in various fields such as Department of cerebral surgery, Department of ENT, abdominal surgery, abdominal surgery, internal medicine, Urology, reconstruction and other fields, such as artificial cranium, artificial nose beam, stomach tube, artificial finger joint, artificial skin, soft tissue expander and so on.
Three, imported O type ring stretching and compression
Stretching and compression are two basic forms of the installation of imported O rings in trenches. The compression force is determined by the initial deformation degree of the O ring and the hardness of the sealing material. Taiwan XOK (100%), which basically guarantees all kinds of parameters of sealing products, including good tensile and compression index. When the rubber ring is used as "inner seal", its maximum circumference compression is 1%. If it exceeds this level, the working life of the rubber ring will be affected. As an outer seal, the inner diameter should be larger than the outer diameter of the groove. The maximum elongation should be 3% (inner diameter > 50mm) or 5%. If the pressure comes from the inside, the outer diameter of the sealing ring should be in contact with the outer diameter of the groove (its circumference compression is less than 1%). If the pressure comes from the outside side, the inner diameter of the rubber ring should be in contact with the inner diameter of the groove, and the maximum allowable stretch is 3%.