Material for soundproofing Hermeton And 30 made on the basis of polyurethane foam with special impregnation, which does not burn, does not absorb moisture and vapor, makes the material resistant to high and low temperatures. The A30 is considered to be environmentally friendly and non-toxic sealer for cars. It doesn't burn, degrade over time, does not accumulate in a mold and microorganisms. The lower adhesive layer also is not afraid of water, so may be in contact with the surfaces, which often accumulates water.
More detailed information about Shumoff Hermeton And 30, you can read the description of the product to Hermeton And 7. The materials are completely identical and differ only in the efficiency and layer thickness. Most often used when training camp boxes (doors, subs, etc.).