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 'iron man' and his 'partner' imitate the weight and shape of two people twisting and turning on a mattress for 25,000 cycles. This test enables assessment of the loss of mattress height and identification of any specific defects as a result.