This International Standard 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%.
BS EN ISO 13967:2009 history
2010BS EN ISO 13967:2010 Thermoplastics fittings. Determination of ring stiffness
2010BS EN ISO 13967:2009 Thermoplastics fittings - Determination of ring stiffness