Reticulated Speaker Foam Product Description * Black Reticulated Speaker Foam , NEW LARGER SIZE * Commonly used to protect speakers from dust and moisture * 48'' x 72'' x 1/4'' Thick * Flexible - conforms easily to curved speaker grills * Cut to size easily with scissors The ''Zapping'' process used to manufacture reticulated foam - Zapping is a process that involves placing a bun of foam in a very large vacuum pressure vessel known as a "zapper". The vessel is evacuated and filled with an explosive gas mixture. The gas is ignited and a controlled flame front passes through the foam, melting the window membranes and leaving the skeletal structure intact. Zapping works with both polyester and polyether polyurethanes. The benefit of the zapping process is a smooth, clean polished cell stand lending itself to repeated cleaning with mild soap and water.
