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ISO 13968:1997 Plastics piping and ducting systems -- Thermoplastics pipes -- Determination of ring flexibility
standard by International Organization for Standardization, 10/01/1997
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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.