| http://www.w3.org/ns/prov#value | - These substances are often added in the form of extremely fine grains, possi- 2 bly together with substances, such as activated carbon, which have a sorbing action, to the starting mixture of chemicals used in making the foam plastic material, so that they are permanently and unreleaseably combined in the cell structure of the foam plastic material after the foaming operation has taken place.
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