quality assurance   Rigorous testing of all products in the laboratory ensures that they meet or exceed, stringent statutory requirements and conform to the highest possible standards. Ingenious tests have been devised to help simulate 10 years' product use and include the following: TRIANGULAR ROLLER TEST DURABILITY OF BED EDGE TEST VERTICAL IMPACT TEST IRON MAN TEST TRAMPOLINE TEST FLAMMABILITY TEST   The trampoline test uses 2 x 28 kg 'indentors' to copy the effects of children repeatedly jumping up and down on a bed. Operating simultaneously for no less than 30,000 cycles, the equipment is used to test both the strength of the bed base and the durability of the mattress's spring unit, although both of these elements are also tested independently.