Microcomputer controlled sponge indentation hardness testing machine
Device model: CMT4203
Equipment use: mainly suitable for flexible foam polymer and materials such as sponge, foam and other indentation hardness under the national standard A method, B method, C method and other test conditions for standard size sponge, foam and other samples Standard test to determine the indentation hardness index, indentation hardness characteristics, indentation hardness test and compressive stress test of sponge, foam and other materials. According to GB and ISO, JIS, ASTM, DIN and other international standards for testing and providing test data.
Executive standard: GB / T10807-2006 / ISO2439: 1997 "Determination of the hardness of flexible foam polymer materials"
GB / T10808-2006 / ISO8067: 1989 "Determination of tear strength of porous polymer elastic materials"
Testing requirements:
Pre-recessed degree:
Apply a force of 5N to the sample to measure the thickness of the sample. After pressing into the sample at a rate of 100MM / MIN and 70% of the thickness of the sample, unload it at the same rate
Method A—Determination of concave hardness index:
After preloading three times, the thickness of the sample is recessed by 40% and kept for 30S, and the force value is recorded
Method B --- Determination of concave hardness characteristics:
After three preloads, the thickness of the sample is recessed by 25% and kept for 30S, and the force value is recorded
Increase the concave degree to 40% from the concave sample thickness of 25% and maintain 30S, record the force value
Increase the concave degree to 65% from the concave sample thickness of 40% and maintain 30S, record the force value
Calculation of recessed coefficient:
The required force value of the concave degree of 25% / the required force value of the concave degree of 40%
The required force value of the concave degree of 65% / the required force value of the concave degree of 40%
Method C --- Indentation hardness test:
After three pre-recess tests, measure the instantaneous maximum after pressing in 40% of the sample thickness
