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Leather — Physical and Mechanical Tests — Determination of Tear Load
Part 2: Double Edge Tear
ISO 3377-2 specifies a method for determining the tear strength of leather using a double edged tear.
The method is sometimes described as the Baumann tear. It is applicable to all types of leather.
A rectangular test piece with a hole of specified shape is placed over the turned up ends of a pair of holders attached to the jaws of a tensile testing machine.
The highest force exerted during tearing of the test piece is recorded.
Tensile testing machine, with:
a force range appropriate to the specimen under test;
a means of recording the force to an accuracy of at least 2 % as specified by Class 2 of ISO 7500-1;
a uniform speed of separation of the jaws of 100 mm/min ± 20 mm/min.
Test piece holders
Each consisting of a strip of steel 10 mm ± 0,1 mm wide and 2 mm ± 0,1 mm thick, bent through a right angle at one end to form a rigid strip with a minimum
length of 12 mm ± 0,1 mm.
The holders either fit into or replace the jaws of the tensile testing machine.
*** Before conducting ISO 3377-2 , it is important to read the entire specification. Standards can be obtained from appropriate standard authorities.
***PARSROS offers several types of grips and fixtures which will enable you to perform a variety of tests
that are accurate and repeatable.