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Strain Effects Upon the Degradation of Fluoroelastomers.

PB89170054

Publication Date	1988
Personal Author	Stevens, C. A.
Page Count	22
Abstract	The investigation was aimed at studying the service behavior of compressed fluoroelastomer O-ring seals, and to interpret the mechanisms causing the observed effects. The aging of Viton E60C in air has revealed that there exists a threshold aging duty below which no chemical degradation is observed. This level is predicted to be some 21 years at 150 C. Aging of Viton at 22% strain was observed to delay the onset of chemical reactions. The threshold aging duty for 22% strain at 150 C was predicted to be some 150 years. The compression set of O-ring following thermal aging was observed to increase with aging. No threshold was observed. These observations were interpreted to mean that no chemical degradation had occurred. The effect of strain upon aging of Viton E60C is to delay chemical reactions. In the case of the compressed O-ring, the strain field is sufficient to prevent all chemical reactions over the range of agings studied, such that the accumulation of compression set was due to solely physical relaxation processes. (Copyright (c) Central Electricity Generating Board, 1988.)
Keywords	O ring seals Gas cooled reactors Elastomers Aging tests(Materials) Service life Compressing Fluorohydrocarbons Degradation Heating Air Strains Tensile properties Computation Tear tests Graphs(Charts) Foreign technology
Source Agency	Dealer Foreign Microinformation Non-Copyright DOCS
NTIS Subject Category	71H - Elastomers 71L - Materials Degradation & Fouling 99C - Polymer Chemistry 77J - Reactor Materials
Corporate Authors	Central Electricity Generating Board, Southampton (England). Marchwood Engineering Labs.
Document Type	Technical Report
Title Note	Research rept.,
NTIS Issue Number	198914

Strain Effects Upon the Degradation of Fluoroelastomers.

Strain Effects Upon the Degradation of Fluoroelastomers.
PB89170054

Publication Date	1988
Personal Author	Stevens, C. A.
Page Count	22
Abstract	The investigation was aimed at studying the service behavior of compressed fluoroelastomer O-ring seals, and to interpret the mechanisms causing the observed effects. The aging of Viton E60C in air has revealed that there exists a threshold aging duty below which no chemical degradation is observed. This level is predicted to be some 21 years at 150 C. Aging of Viton at 22% strain was observed to delay the onset of chemical reactions. The threshold aging duty for 22% strain at 150 C was predicted to be some 150 years. The compression set of O-ring following thermal aging was observed to increase with aging. No threshold was observed. These observations were interpreted to mean that no chemical degradation had occurred. The effect of strain upon aging of Viton E60C is to delay chemical reactions. In the case of the compressed O-ring, the strain field is sufficient to prevent all chemical reactions over the range of agings studied, such that the accumulation of compression set was due to solely physical relaxation processes. (Copyright (c) Central Electricity Generating Board, 1988.)
Keywords	O ring seals Gas cooled reactors Elastomers Aging tests(Materials) Service life Compressing Fluorohydrocarbons Degradation Heating Air Strains Tensile properties Computation Tear tests Graphs(Charts) Foreign technology
Source Agency	Dealer Foreign Microinformation Non-Copyright DOCS
NTIS Subject Category	71H - Elastomers 71L - Materials Degradation & Fouling 99C - Polymer Chemistry 77J - Reactor Materials
Corporate Authors	Central Electricity Generating Board, Southampton (England). Marchwood Engineering Labs.
Document Type	Technical Report
Title Note	Research rept.,
NTIS Issue Number	198914