BS 5131-1.2:1991

Foreword
Committees responsible
Method
1 Scope
2 Principle
3 Apparatus
4 Preparation and bonding of test assemblies
5 Conditioning
6 Cutting of test specimens
7 Procedure
8 Additional tests
9 Expression of results
10 Test report
Figures
1.2/1 Test specimen (cut from test assembly prepared as
       described in BS 5131 : Section 1.3 or prepared by
       indirect bonding as described in BS 5131 :
       Section 1.7)
1.2/2 Test assembly prepared by direct bonding as
       described in BS 5131 : Section 1.7
1.2/3 Test specimen (cut from test assembly prepared by
       direct bonding as described in BS 5131 : Section
       1.7)
1.2/4 Types of bond failure
1.2/5 Example of a typical graph of peeling force
       against extension which includes an initial peak

Method for measuring the resistance of an adhesive joint when subjected to peeling at a constant rate of separation.

This Section of BS 5131 describes a method for measuring the strength, in terms of resistance to peeling, of a bond between two sheet materials that have been bonded together. The method is applicable to a great variety of combinations of upper materials, soling materials and adhesives, where at least one of the adherends is flexible.

NOTE 1 The purpose of the method is to test joints rather than to compare adhesives. As a consequence, unlike BS 5131-1.1, no recommendations are given concerning appropriate adherends. In BS 5131-1.1 the two adherends are subjected to a constant separating force, and therefore in principle the test specimen may remain intact. In this Section, the two adherends are pulled apart at a constant rate; the test specimen will inevitably fail, and it is the forces required to cause the test specimen to fail and the nature of the failure that are under investigation. This test is more destructive in its philosophy than the test described in BS 5131-1.1. In BS 5131-1.1 the failures (e.g. cohesive failure of the adhesive layer, or failure of adhesion to one adherend) are associated with the adhesive. In this Section, however, alternative types of failure which may take place within the adherend are described.

NOTE 2 For the peel bond strength of specimens cut from made-up footwear see BS 5131-5.4.

NOTE 3 The titles of the publications referred to in this standard are listed on the inside back cover.