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 %.
Tämän julkaisun valmistelusta Suomessa vastaa Muoviteollisuus ry, puh. 09 172 841 (vaihde).
Sisällysluettelo
Foreword
1 Scope
2 Terms and definitions
3 Symbols
4 Principle
5 Apparatus
6 Test pieces
6.1 Preparation
6.2 Number
6.3 Determination of dimensions
6.4 Age
7 Conditioning
8 Test temperature
9 Procedure
10 Calculation of ring stiffness
11 Test report
Annex A Comments on the use of this test method (informative)