Our Aqua AF2L fine pore utility polyester sponge is made from hydrophilated polyester, the most absorbent foam. Because of its size, shape and durability, the AF2L is often used by tile and grout professionals. The AF2L polyester sponge stays soft (wet or dry), floats, is resistant to organic solvents and can be sterilized by boiling. Because of its utility, this sponge can be used for all types of masonry, painting, texturing and general cleaning projects.