Equipment name: Microprocessor controlled sponge indentation hardness testing machine

Equipment model: CMT4203

Equipment use: It is mainly applicable to soft foam polymer materials such as sponge, foam and other indentation hardness. Under the standard requirements of Method A, Method B, Method C and other test conditions, standard size sponge, foam and other samples are tested to determine the indentation hardness index, indentation hardness characteristics, indentation hardness inspection and compression stress test of sponge, foam and other materials. Conduct tests and provide testing data in accordance with international standards such as GB, ISO, JIS, ASTM, DIN, etc.

Executive standard: GB/T10807-2006/ISO2439:1997 Determination of Hardness of Flexible foam Polymeric Materials

GB/T10808-2006/ISO8067:1989 "Determination of tear strength of polymer porous elastic materials"

Testing requirements:

Pre concave degree:

Apply a force of 5N to the sample to measure its thickness. After pressing 70% of the sample thickness at a rate of 100MM/MIN, unload at the same rate

Method A - Determination of indentation hardness index:

After three rounds of preloading, insert 40% of the sample thickness into the groove and maintain it for 30 seconds, and record the force value

Method B - Determination of indentation hardness characteristics:

After three rounds of preloading, insert 25% of the sample thickness into the groove and maintain it for 30 seconds, and record the force value

Increase the indentation degree from 25% of the sample thickness to 40% and maintain it for 30 seconds, and record the force value

Increase the indentation degree from 40% of the sample thickness to 65% and maintain it for 30 seconds, and record the force value

Calculation of concave coefficient:

Force required for 25% indentation/Force required for 40% indentation

Force required for 65% indentation/Force required for 40% indentation

Method C - Determination of indentation hardness test:

After conducting three pre indentation tests, measure the instantaneous maximum value after 40% of the pressed sample thickness