BS EN 1446:1996- Plastics piping and ducting systems.Thermoplastics pipes. Determination of ring flexibility
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This standard specifies a method for testing the ring flexibility of a thermoplastics pipe having a circular
cross section.
The method enables determination of the deflection, and necessary force, at which physical damage, if any
(see 7.2), occurs within 30 % diametric deflection.