The Wallace Compression Set Apparatus (Constant Strain) - C3/C4

British Standard Model - C3
Single daylight    (2 plate)  C3/1
Double daylight  (3 plate)  C3/2
Triple daylight     (4 plate)   C3/3

British Standard Model - C4
Single daylight    (2 plate)  C4/1
Double daylight  (3 plate)  C4/2
Triple daylight     (4 plate)   C4/3       

Definition

The set is the residual strain in a rubber test piece after it has been subjected to stress for a given time and then allowed to recover for a given time, the temperature being substantially constant during the test. 'Compression Set' is the residual compression strain after compression, (a) to a given compression strain, or (b) a given compression stress.

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