MaterSeal 921 is a reticulated closed-cell polyethylene foam joint-filler and backing for sealants. It compresses easily to accommodate joints of varying widths.

Features

• Nongassing when punctured to eliminate bubbling of sealant
• Reticulated closed-cell polyethylene foam for low moisture absorption
• Nonimpregnated, nonstaining, and nonbleeding, will not discolor sealants or substrates
• Highly resilient to conform to irregular joints; installs easily and quickly
• Nonadhering to sealants, requiring no additional bondbreaker