Passing security certification is just a basic requirement for our products. IWMH uses rigorous means of repeated verification to keep users safe in terms of structure, accessory durability and load-bearing.This stringent standard is enforced from the product design stage.
Armrest durability test
Simultaneously, apply a force of 400 N (90 lb) to each armrest to ensure an initial angle of 10 ° ± 1 °. If the handrail is shifted or rotated, the loader must be able to follow the handrail to do the same action. This force must load and unload 60,000 cycles at a rate of 10 to 30 cycles per minute. The armrest loader must load the load in an area of 100 mm (4 inches) long on the inner edge of the armrest. The load force center and the inner edge of the armrest must not exceed 25 mm (1 inch). The armrest of the chair cannot lose function after the test is complete.
Backend durability test
Place 109 kg (240 lb) in the center of the seat and apply a 445 N (100 lb) force to the specified position on the backrest at a rate of 10 to 30 cycles per minute. If the width of the back rest of the chair at the load height position is less than or equal to 406 mm (16 inches), perform 120,000 cycles. If the width of the back of the chair at the load height position is greater than 406 mm (16 inches), after 80,000 cycles, maintain the above load height, move the load to the right 102 mm (4 in) position of the back-to-back vertical center line to perform 20,000 cycles, and then move the load to the left side of the back-to-back vertical center line to perform 20,000 cycles. After the test is complete, the chair cannot lose function.
Let a test sandbag, which is suspended over an uncompressed seat 36 mm (1.4 inches), feel free to fall and hit the seat, remove the test sandbag, and repeat 100,000 cycles. If the impact height changes by more than 13 mm (0.5 inches) during the test, the impact height and/or seat height need to be adjusted to the specified value. The cycle unit should set the rate at 10 to 30 cycles per minute. The chair cannot lose functionality after the test is complete.
Base durability test
Place a static vertical downward pressure load of 122 kg (270 lb) on the base to roll the sample 2000 times on a hard surface with 3 barriers and on a hard and smooth surface without obstacles 98000 cycles. Not less than 762 ± 50 mm (30 ± 2 Inch) rolling back and forth on the surface of the distance once is regarded as a cycle, a total of 100,000 cycles. After the test is completed, the casters cannot lose function. No part of the wheel can be pulled out of the position of use with a force of 22 cattle (5 pounds).
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IWMH insists on strict control of product quality and responsible attitude to users, just like our slogan: Got your back ！