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Dongguan Mingzhen Rubber & Plastic Products Co., Ltd.

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Dongguan Minz Rubber & Plastics Co., Ltd.

Add.: No.4, New Industrial Road, Shipai Tangwei, shipai town, Dongguan City
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Failure Phenomenon of O-type Rubber Sealing Ring and Its Solution

Release time:

2019-05-28 12:30

Source:

O-ring rubber sealThe failure phenomenon and solution.
 
The extensive use of rubber sealing ring is not tight to bring good sealing effect, there are many factors affecting the seal. In-depth understanding of the failure phenomena affecting the O-type rubber sealing ring and its solutions: the sealing ring presents a neat wound; Sharp sealing edges and no assembly chamfer; The size of the sealing ring is incorrect; The hardness or elasticity of the sealing ring is too low; Deburring and chamfering; Select sealing elements with appropriate size; Select sealing ring materials with better elasticity and higher hardness;
 
Sealing ring extrusion sealing ring has rough and broken edges, usually on the side with low pressure; The gap is too large; The hardness or elasticity of the sealing ring is too low; The groove space is too small; The gap size is irregular; The edge corner of the groove is too sharp; The size of the sealing ring is not suitable; Reduce the gap size; Choose a seal with better elasticity and higher hardness; Reasonable groove design; Select a sealing ring with appropriate size; The contact surface deformation is deformed; the temperature is too high;
 
Incomplete vulcanization of the material; high deformation rate of the material; excessive expansion of the material in chemical medium; selection of materials with low deformation rate; reasonable groove design; confirmation of compatibility between the material and the medium; over-compression of the sealing ring surface shows planar deformation and may be accompanied by cracks; unreasonable design; the deformation of the material due to heat or chemical medium is not considered; caused by excessive pressure; the chemical and thermal changes of the material are considered in the groove design; chemical corrosion can cause foaming, cracking, small holes, fading, etc., which can be known by measuring its physical properties;
 
The material is inconsistent with the medium; the temperature is too high; select the material with more chemical resistance; the high temperature contact surface of the hot corrosion sealing ring shows radial cracks, and some materials may become soft or even more glossy; the material cannot withstand high temperature, or the temperature exceeds the expected temperature, or the temperature changes too fast and frequently select the material with high temperature resistance, if possible, reduce the temperature of the sealing surface as much as possible, particles of material wear can be found on the sealing surface; the sealing surface is not smooth enough; the temperature is too high; the sealing environment penetrates into the abrasive dirt;
The seal produces relative movement; the surface treatment of the sealing ring is not complete; the recommended groove finish is used; the self-lubricating material is used; the worn parts and environment are caused; the surface of the sealing ring of the sealing medium is discolored, and powdery substances remain on the surface at the same time, and there are corrosion traces on the side not in contact with the medium; the chemical reaction produces electrolysis, splash corrosion (material loss caused by ion impact on the structure surface), burning, and unreasonable groove design; the sealing material is not compatible with the medium; select the material compatible with the medium; reduce the exposed area; check the groove design;
 
The surface of the melting waterfall sealing ring shows bubbles, pits, and when the pressure is very high, the material absorbs the gas in the medium. When the pressure suddenly decreases, the gas quickly escapes, resulting in the sealing skin. The pressure changes too fast; The hardness or elasticity of the sealing material is too low; Select materials with high hardness and high elasticity; Reduce the speed of decompression and curl on the surface. Installation caused; The movement speed is too low; The material is too hard or the elasticity is too low;
 
The surface treatment of O-ring is uneven and the groove size is uneven. The groove surface is rough and the lubrication is insufficient. Correct installation; Select high elastic materials; Select self-lubricating materials; Proper groove design and meet the required processing accuracy; Try to use support ring; The size of the sealing ring is usually reduced in cross-sectional size, which is difficult to detect. Improper vulcanization of materials; High vacuum sealing requirements; The hardness of the material is too low or the material is made; avoid the use of materials with plasticizers; confirm that the seal has undergone correct vulcanization treatment to reduce leakage; Contaminated seal ring section has foreign matter; The production process environment is polluted; The material encounters corrosion or reaction; The material is non-semiconductor industry grade material; Strengthen the environmental control during the production, transportation and use of the seal ring;

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More information

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What are the molding techniques of rubber products?

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How to print the pattern on the transparent key

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