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Generally, the density of high-end sofa cushion high-density sponge is above 30 kg\/cubic meter, the density of backrest high-density sponge is above 25KG\/ cubic meter, and it is best to sit after the sofa cushion with a dent of 10cm. If the density is insufficient, there is no malleability to sit up, and the feeling of sitting is very dead and uncomfortable.
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② Look at the ductility of high-density sponge
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Good high-density sponges are very malleable and do not tear easily. If there is a gently pulled off a piece of the situation, it must be shoddy high-density sponge. Used to fill the sofa cushions, it will completely collapse down over time.