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Anonymous users2024-01-24It is only required to do its tensile strength Then you can measure a value according to the test method, and then hand over the value The main engine factory did not ask you to determine whether the PUR polyurethane foam used in the car is qualified!
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Anonymous users2024-01-23Strong sponges in the general market are OK.
There are certainly yes, the general sponge is made of wood cellulose or foamed plastic polymer, in addition, there are three types of synthetic sponges made of other materials, including low-density polyether (non-absorbent sponge), polyvinyl alcohol (superabsorbent material, no obvious porosity) and polyester.
First of all, ask what the true density of the sponge is. Many sponge labels on the market are inflated, saying that it is 50, but there is no 50 at all. It is necessary to ask if there is really 50 kilograms per cubic meter. >>>More
The sponge itself is produced by mixing toxic and harmful substances, and a large amount of toxic gas will be released during the production process, which is very pungent; There will be residual toxic gas in the air of the finished sponge, and sponge spraying will be used to complete the sofa when using sponge; So the smell is definitely toxic; Never burn a sponge as it can be highly toxic;
The good sofa uses DuPont high-density flame retardant sponge, and you can't remember the specific model, you can ask their sales staff.
Artificial sponges are made of polyurethane material. There is also a natural sponge, which is a simple multicellular marine animal, one of the earliest multicellular organisms on earth. It is known that there are more than 5,000 species of sponges in the world, but only about 15 species have use value, and people call them "tame" sponges. >>>More