SpecSeal Series SSP Putty; 36 Cu. In. Tube (.6 Liter) SpecSeal Series SSP Putty is used to seal through-penetrations as well as construction gaps and blank openings. SpecSeal Series SSP Putty is a non-hardening, intumescent compound designed to seal throughpenetrations as well as certain membrane penetrations against the spread of fire, smoke and toxicgasses. SpecSeal Putty expands up to eight times its original size when exposed to high temperatures or flames. Requiring no tools, SpecSeal Series SSP Putty is soft and pliable making it easy to install by hand packing into openings. Its aggressive adhesion makes it suitable for use with all common construction materials as well as cable jacketing and pipes. SpecSeal Putty remains soft and easy to reuse or retrofit.