The names of sponges in the ring packing box can be said to be varied and varied. At present, there is no standard name for the sponge in the packaging box, and all the names are made up by the packaging sponge manufacturers themselves, which has caused great trouble to customers. Generally, the sponge in the packing box is a sponge with a density of about 14KG and a hardness of about 50. There is also a sponge called 324. This name comes from the name of Taiwan Province shoe sponge. These names are the factory's own numbers, and each factory is different.
The price of sponges in the box varies greatly. The raw materials of sponge are all extracted from petroleum, and the price generally changes with the price of petroleum, which fluctuates greatly every year. When it is high, it is much more expensive than when it is low, even one or two times worse. The quality of the sponge in the box is also much worse. According to the different resilience, whether powder is added or not, the price of sponge with the same weight will be much worse.
Selection of sponge:
1. When selecting a sponge, its tactile sensation and elasticity are the primary judging factors. It should feel soft and malleable.
2. In addition, one of the most practical identification methods is to fold the sponge in half and rub it against each other. If the sponge crumbs fall off without rubbing a few times, it should be eliminated.