Seal failure analysis; we solve o-ring, sealing problems_2.pdf

1/2/2018

Seal failure analysis; we solve o-ring, sealing problems.

Problem Solving Products, Inc.

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Home > O-ring, Seal Failure Analysis > Analysis  > Part 2

O-ring and Seal Failure Part 2 Chemical Degradation, Thermal Degradation and Explosive Decompression

Chemical Degradation Description: The Description: The o-ring or seal may exhibit many signs of degradation including blisters, cracks, voids or discoloration. In some cases, the degradation is observable only by measurement of physical properties. Con ontributing tributing Factors: Factors: In Incompatibility compatibility with the chemical and/or thermal enviro nviron nment. Suggested Solu Solutions: tions: S  Selection election of more chemically resistant resis tant elastomer.

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Thermal Degradation Description: The Description: The o-ring or seal may exhibit radial cracks located on the highest temperature surfaces. In addition, certain elastomers may exhibit signs of softeninga shiny surface as a result of excessive temperatures. Contributing Factors: Elastomer Factors: Elastomer thermal properties. Excessive temperature excursions or cycling. 1/2

1/2/2018

O-ring, Seal Design O-ring, seal design O-ring, seal failure Environment Design analysis Elastomer General factors Seal failure 1 Seal failure 2 Seal failure 3 Seal failure 4 PSP o-ring sizes

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Seal failure analysis; we solve o-ring, sealing problems.

Suggested Solutions: Selection of an elastomer with improved thermal stability. Evaluation of the possibility of cooling sealing surfaces.

Explosive Decompression Description: The o-ring or seal exhibits blisters, pits or pocks on its surface. Absorption of gas at high pressure and the subsequent rapid decrease in pressure. The absorbed gas blisters and ruptures t he elastomer surface as the pressure is rapidly removed. Contributing Factors: Rapid pressure changes. Low-modulus/ hardness elastomer. Suggested Solutions: Highermodulus/hardness elastomer. Slower decompression (release of pressure). Next Topic Plasma Degradation, Contamination and Abrasion

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