Standard Test Method for
Peel or Stripping Strength of Adhesive Bonds
This test method covers the determination of the comparative peel or stripping characteristics of adhesive bonds
when tested on standard-sized specimens and under defined
conditions of pretreatment, temperature, and testing machine
speed.
Terminology
Flexible:- in this test method, indicates a material of
the proper flexural strength and thickness to permit a turn back
at an approximate 180° angle in the expected loading range of
the test without failure. In order to fulfill all terms of the
definition, at least one of the adhered materials must be
flexible.
Peel or stripping strength, n—the average load per unit
width of bond line required to separate progressively one
member from the other over the adhered surfaces at a separation angle of approximately 180° and at a separation rate of 152
mm (6 in.)/min. It is expressed in kilograms per millimeter
(pounds per inch) of width.
Apparatus
Testing Machine—A power-driven machine, with a constant rate-of-jaw separation or of the inclination balance or
pendulum type, which fulfills the following requirements:
The applied tension as measured and recorded is
accurate within 61 %.
Hold specimens in the testing machine by grips which
clamp firmly and prevent slipping at all times.
The rate of travel of the power-actuated grip is 305
mm (12 in.)/min. This rate which provides a separation of 152
mm (6 in.)/min is to be uniform throughout the tests.
Operate the machine without any device for maintaining maximum load indication. In pendulum-type machines, the
weight lever swings as a free pendulum without engagement of
pawls
The machine is autographic giving a chart having the
inches of separation as one axis and applied tension as the other
axis of coordinates.
The capacity of the machine is such that the maximum
applied tension during test does not exceed 85 % nor be less
than 15 % of the rated capacity
Conditioning Room or Desiccators—A conditioning
room capable of maintaining a relative humidity of 50 6 2 %
at 23 6 1°C (73.4 6 2°F), or desiccators filled with a saturated
salt solution (Note 1) to give a relative humidity of 50 6 2 %
at 23 6 1°C are required for the conditioning of some
specimens