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ISO 13967:2009
Thermoplastics fittings - Determination of ring stiffness
ISO 13967:2009 specifies a method of determining the ring stiffness of bends and branches made from thermoplastic material and for use with plastics pipes having a circular cross-section. The method can be used to determine the stiffness of bends, equal branches and unequal branches, provided the fitting allows a diametric deflection of at least 4 %.
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International Organization for Standardization [iso]
International Organization for Standardization [iso]