Physical testing
Thickness
Synthetic rubber
Natural rubber
Vulcanized rubber
Compression testing
Testing conditions
Specimen preparation
Thermoplastic polymers
Test equipment
Plastics and rubber technology
Ambient temperature
Vulcanization
Stress relaxation
Link: BS ISO 3384-1:2019 Rubber, vulcanized or thermoplastic. Determination of stress relaxation in compression Testing at constant temperature
Source: BSI Standards