Category: Manufacturing Technology knowledge

Improper design and use of O-ring will accelerate its damage and lose its sealing performance. The experiment shows that if each part of the sealing device is reasonably designed and the pressure is simply increased, the O-ring will not be damaged. Under the working conditions of high pressure and high temperature, the main reasons for O-ring damage are the permanent deformation of O-ring materials and the gap bite caused by O-ring being squeezed into the sealing gap. The primary O-ring appears distorted during movement. 1. Permanent deformation Because the synthetic rubber material used for O-ring seal ring is viscoelastic material,…

Generally, there are four types of gasket leakage: interface leakage, seepage leakage, diffusion leakage and damage leakage. Interface leakage: leakage will occur on the sealing interface due to insufficient gasket compression, improper flange joint surface finish, flange deformation, etc. For the leakage at the interface, it can be prevented by clamping it in the flange face with soft cushion. Infiltration and leakage: as the material of soft material is mostly fiber, it is easy to be soaked by medium, especially under pressure. Due to capillarity, the medium will permeate to the low-pressure side, forming infiltration. Diffusion leakage: under the promotion…

On the basis of maintaining the excellent properties of silicone materials such as heat resistance, cold resistance, high voltage resistance and weather aging resistance, FVMQ fluorosilicone O-ring has excellent hydrogen resistant solvents, oil resistance, acid and alkaline resistance and lower surface performance due to the introduction of fluorine containing groups. Features of fluorosilicone rubber: 1. Oil resistance, solvent resistance and chemical resistance Compared with methyl vinyl silicone rubber, fluorosilicone rubber has excellent oil resistance, solvent resistance and chemical resistance; Even compared with fluororubber, oil resistance and solvent resistance are also good. It shows excellent durability after immersion in the same…

As a kind of synthetic polymer elastomer containing fluorine atoms on the main chain or side chain carbon atoms, fluororubber has incomparable high temperature resistance, chemical medium resistance and aging resistance properties, and has become an indispensable and irreplaceable basic material in modern industry, especially in the high-tech field. Beijing Institute of Aeronautical Materials has been conducting research on the compounding technology of fluoroelastomer since the 1970s, and has successively developed a series of fluororubber compounds with different properties and functions, which have been successfully used in aviation, aerospace, shipping, petroleum, automotive industries and other fields. In this paper, according…

During the processing, storage and use of rubber and its products, the physical and chemical properties and mechanical properties of rubber gradually deteriorate due to the combined effect of internal and external factors, and finally lose their use value. This change is called rubber aging. The surface is cracked, sticky, hardened, softened, powdery, discolored, mildewed, etc. A) Oxygen: the oxygen reacts with the rubber molecules in the rubber by free radical chain reaction, and the molecular chains break or cross link excessively, which causes the change of rubber properties. Oxidation is one of the important reasons for rubber aging. B)…

Improper design and use of O-ring will accelerate its damage and lose its sealing performance. The experiment shows that if each part of the sealing device is reasonably designed and the pressure is simply increased, the O-ring will not be damaged. Under the working conditions of high pressure and high temperature, the main causes of O-ring damage are the permanent deformation of O-ring materials and the clearance bite caused by O-ring being squeezed into the sealing clearance, and the O-ring is distorted during movement. 1. Permanent deformation Because the synthetic rubber material used for O-ring seal ring is viscoelastic material,…

Rubber O-ring products are widely used Rubber for computer and peripheral equipment: non-standard customized rubber products and various sealing and damping rubber parts for office automation equipment. Electronic and electrical appliances: used for various customized rubber products and rubber sealing products of electronic and electrical appliances. Rubber for automobile industry: used for sealing and damping rubber products in automobile industry. Medical rubber products: various rubber products, rubber stoppers and bottle stoppers used for medical equipment and consumables. Other industrial rubber: various rubber products used in other industries for sealing, shock absorption, conductivity, insulation and other purposes. Rubber for special equipment:…

Nitrile butadiene rubber NBR (Nickel Rubber) is made by copolymerization of acrylonitrile and butadiene. The acrylonitrile content ranges from 18% to 50%. The higher the acrylonitrile content, the better the resistance to petrochemical oil hydrocarbon fuel oil, but the low temperature performance becomes worse. The general use temperature range is - 25~100 ℃. Nitrile butadiene rubber is one of the most commonly used rubber for oil seal and O-ring. advantage: ·It has good characteristics of oil resistance, water resistance, solvent resistance and high pressure oil resistance. ·Good compression deflection, abrasion resistance and elongation. Disadvantages: ·Not suitable for use in polar…