How are weight limits on chairs and other things tested?
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Often times companies will utilize a series of incremental weights. Once the product is able to withstand a certain weight without compromising the structural integrity they move to the next weight.
They will also have these weights bearing down on the product for several hours or days evens to be sure the product design can withstand prolonged exposure or repeated pressure, aka lifting the weights, resting them on the product and lifting again etc.
Once the product has shown an inability to remain structurally sound that is now the weight capacity. Also often times they just get your mom to sit on it, much cheaper.
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