NS EN 978 : 1ED 1997

1 Scope
2 Normative references
3 Definitions
    3.1 Factor a
    3.2 Factor b
4 Principle
5 Apparatus
    5.1 Testing machine
    5.2 Four point test rig
    5.3 Measuring device
    5.4 Oven for post curing
    5.5 Waterbath
6 Test specimens
    6.1 Number of test specimens
    6.2 Shape and size of test specimens
7 Procedure
    7.1 Determination of the initial beam stiffness
    7.2 Determination of factor a
    7.3 Determination of factor b
8 Test Report

Defines a method of test for determining the factor a and factor b of test specimens of tanks of glass reinforced thermosetting resins for storing liquids underground.