ASTM-D1995 – Standard Test Methods for Multi-Modal Strength Testing of Autohesives (Contact Adhesives)- Cleavage Method
Cleavage method is done per ASTM D1062 test method for cleavage strength of metal-to-metal adhesive bonds.
Contact adhesives or contact cements are usually based on solvent solutions of neoprene. They are so named because they are usually applied to both surfaces to be bonded. Following evaporation of the solvent, the two surfaces may be joined to form a strong bond with high resistance to shearing forces. Contact cements are used extensively in the assembly of automotive parts, furniture, leather goods, and decorative laminates. They are effective in the bonding of plastics.
These test methods cover procedures by which autohesives can be tested in four commonly practiced stressing modes, namely:
Compression shear ( ASTM D905),
Cleavage ( ASTM D1062),
Climbing drum peel (ASTM D1781), and
T-peel (ASTM D1876),
and in various combinations of rigid-to-rigid, flexible-to-rigid, and flexible-to-flexible adherends that include wood, aluminum, steel flakeboard, and plastic laminates.
Quantitative test methods that involve bond formation by impact are also provided.
Three pressure modes are provided: static, roller, and impact.
Because there are many types of contact adhesives being used to bond many different materials under widely differing conditions, these test methods are designed to allow the user to select the test mode, coating thickness, temperature and relative humidity conditions, pressure magnitude and mode, open time, and bond-conditioning time.
The bond-formation process used with autohesives is unlike that of all other adhesives and in consequence, testing of autohesives requires methods that are unlike those provided by other ASTM standards. See .
A choice of adherends is available in each test mode. The combination of adherends that can be bonded together is limited to those shown in .
Methods for application of pressure are available in each test mode. For a particular combination of substrates, the means available for application of pressure are limited to those shown in .