Llinear&reciprocating-Application failures-detoriation& degradation

Failure mode

detoriation / degradation (hydrolysis)

Failure cause

material-incompatibility with fluid

water content in fluid can degradiate standard

 polyurethane

material at higher temperatures >60°C

Remedial measures

change to hydrolytic resistant seal material

reduce water content in the fluid

reduce operating temperature, if possible

If applicable, change to a hydrophobe fluid

Failure mode

detoriation / degradation (hydrolysis)

Failure cause

material-incompatibility with fluid

water content in fluid can degradiate standard 

polyurethane material at

higher temperatures >60°C

Remedial measures

change to hydrolytic resistant seal material

reduce water content in the fluid

reduce operating temperature if possible

Failure mode

detoriation / degradation (hydrolysis)

Failure cause

water content in fluid can degradiate standard

 polyurethane material at temperatures >60°C

Remedial measures

replace seal material (e.g. more hydrolytic 

resistant PU)

reduce water content in fluid

reduce operating temperature if applicable 

replace fluid

Failure mode

detoriation / degradation (break off of seal lip)

Failure cause

hydrolytic degradation of PU-seal material

Remedial measures

replace seal material (e.g. more hydrolytic resistant PU)

reduce water content in fluid

reduce operating temperature

if applicable, replace fluid

failure mode

detoriation / degradiation

failure cause

missing structure strength of PTFE

compound at higher temperatures and 

pressures

process failure of material by insufficient 

compounding / moulding / sintering

remedial measures

change material (e.g., high performance PTFE

-compound)

reduce operating temperature