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DIN EN 1228:1996
Glass-reinforced thermosetting plastics (GRP) pipes - Determination of initial specific ring stiffness
The document specifies a method for determining the initial specific ring stiffness of glass-reinforced thermosetting plastics (GRP) pipes. Two methods are given and within the specified deflection limits each is equally valid and may be used for any diameter.
Deutsches Institut für Normung [din]