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Compression Stress Relaxation or CSR is a measure of the ability of an elastomer to seal efficiently when held in compression over time and in varying environmental conditions between two rigid faces. The stress at the interface between the elastomer and the rigid faces is important for efficient sealing and is a function of the modulus of the elastomer and the strain applied.

CSR is used by industries including aerospace, automotive and construction to understand the characteristics of elastomeric seals. Seals are used in numerous applications e.g. O-rings in pipe joints or seals in aero and automotive engines. For safety, warranty and product liability reasons, it is essential that these components, whilst under compression, operate without failure for many years.