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At ADETEX FOAM GROUP, we are constantly testing our products for latex quality control. The following section shows the different tests conducted.
Samples of 380 x 380 x 100 mm (each specimen composed of 10 sheets of 1-cm thick foam) and of 380 x 380 x 50 mm (each specimen composed of 5 sheets of 1-cm thick foam) are compressed in a universal testing machine at a speed of 100 mm/min. using two surfaces, a top and a bottom. The bottom surface is a 50-mm flat plate perforated with 5-mm diameter needles, 20 mm apart. The top surface is a 204-mm diameter circle.
The force required to compress the foam to 25%, 40% and 65% of its thickness is recorded. Hardness under indentation (N) (thickness: 100 mm) / Hardness under indentation (N) (thickness: 50 mm).
Samples of 380 x 380 x 100 mm (each specimen composed of 10 sheets of 1-cm thick foam) are compressed between two 500-mm plates up to 75% deformation and kept in this state for 22 hours at 23°C and 50% relative humidity.
Once this period has elapsed and the foam has been left to rest for 30 minutes, the loss of height and hardness under indentation are calculated as specified previously.
The thickness of samples of 50 x 50 x 25 mm (each specimen composed of 1 sheet of 1.5-mm thick foam and another of 1 mm) is measured. The samples are then compressed between two 100-mm plates up to 50% deformation and kept in this state for 72 hours at 23°C.
Once this period has elapsed and the foam has been left to rest for 30 minutes, the loss of thickness of the foam is calculated.
Samples of 380 x 380 x 50 mm (each specimen composed of 5 sheets of 1-cm thick foam) are subjected to 80,000 cycles of dynamic fatigue under a constant force of 750 N. The loss of thickness and hardness are calculated.
Once this period has elapsed and the foam has been left to rest for 30 minutes, the loss of height and hardness under indentation are calculated as specified previously.
A tensile stress at a speed of 500 mm/min. is placed on specimens punched with the shape specified by the standard. The breaking force is recorded and the breaking load is calculated as force per unit area.
The elongation of the specimen is also recorded at the breaking point and the result expressed as a percentage of the initial length.
