Elastomer tests

A prerequisite for a consistently high quality standard is constant, strict mixture control . Raw materials, rubber mixtures and vulcanizates are tested. Comparable test results are obtained using precisely defined test methods and test specimens.

In Germany, the DIN regulations are binding; alternatively, the American ASTM standards are used as a benchmark. Below are some important test methods, which – unless otherwise stated – are carried out at room temperature.

test equipment

The testing methods are divided into non-destructive and destructive testing methods.

The non-destructive testing methods are primarily used as part of quality assurance in production as incoming production and acceptance tests.
In the destructive testing methods, a distinction is made between mechanical, technological and chemical testing methods.

Hardness is the resistance that the rubber offers to the penetration of a hard body.

Hardness is usually measured using a Shore A tester , in which a truncated cone needle is pressed into the rubber surface by a spring. The further the needle can penetrate into the rubber - i.e. the softer the rubber - the smaller the pointer deflection on the measuring scale, which ranges from 0 Shore A to 100 Shore A. A Shore A hardness tester is useful in the range 10-90 Shore A. For harder mixtures and hard rubber, however, a Shore D device is used.

It has a sharper needle and a stronger spring.

There are the following test methods:

Synonyms: Behavior against liquids, vapors and gases (DIN 53521), hot air aging (DIN 53508), compression set (DIN EN ISO1856), rebound elasticity (DIN 53512), tear resistance (DIN 53507 and 53515), abrasion test (DIN 53516), hardness test , torsion , compression test , impact test , fatigue test , tensile test