Mechanical – Paul Wu's Blog

Rubber Resilience Test

Bases on ASTM D2635, Rubber resilience is the ratio of rebound height to drop height of a metal plunger of prescribed mass and shape which is allowed to fall on the rubber specimen.

Hardness measurement-ASTM D2240

Material hardness represents the capability of resisting the penetration of a harder body. The harder material wears or scratches the softer material.

Tumble test and drop test are critical to evaluate a product’s ability to survive the many bumps and scrapes it will experience in its life cycle with an end-user. Tumble test is more random while drop test can control drop orientation, impact point, etc.

Lap shear test for PSA

Dynamic shear is an important parameter to evaluate the cohesive strength of a PSA. It is commonly measured based on the ASTM D1002.

WVTR Measurement-P2O5 Moisture Sensor

For WVTR measurement, moisture sensor is one of the critical components which determine the accuracy of the testing results

WVTR Test-ASTM F1249

Another standard for the WVTR test is ASTM F1249.

Water Vapor Transfer Rate Test by cup method

WVTR testing

ASTM E 96 is a standard for the testing of water transfer rate using cup method, in which two methods is elaborated: Desiccant Method and Water Method. The following content is copied from the linked website.

Foam compression set

Compression set is an important parameter to evaluate the foam’s permanent deflection which determines the long term performances,. e.g. sealing, isolation.

Wet Tensile Tests

Wet tensile strength of a sample is important to evaluate the mechanic performances subjected to moisture and stress during processing or use. It is particularly useful for measuring paper and other materials which are easily damaged by handling when wet.

Initial tack tests

According to PSTC’s definition, tack is the property of a pressure sensitive adhesive that allows it to adhere to a surface under very slight pressure. Continue reading “Initial tack tests”