Product Description

The STI SpecSeal® SSP Putty & Putty Pads are non-hardening, intumescent firestop materials designed to seal penetrations and electrical boxes against fire, smoke, and hot gases. They expand up to 8× under heat, creating a flexible, endothermic barrier that absorbs heat and releases water.
Putty can be hand-packed into openings for pipes, cables, and penetrations, while Putty Pads are pre-sized for electrical switch and receptacle boxes, reducing sound transmission and increasing fire resistance.

Key Benefits

• Non-Hardening & Reusable – Remains soft, pliable, and easy to retrofit or repair.
• High Expansion – Expands up to 8× under fire for reliable protection.
• Endothermic Fillers – Absorb heat and release water to slow fire spread.
• Acoustic Seal – STC 62 rating reduces noise transmission through assemblies.
• Versatile Applications – Suitable for penetrations, blank openings, med-gas valve boxes, and electrical boxes.
• Safe & Clean – Solvent-free, fiber-free, mold resistant, and UL/FM approved.

Packaging

• Putty Bars: SSP100 – 36 in³ (0.6 L), SSP28 – 24 in³ (0.4 L)
• Putty Pads: SSP4S – 7.25” × 7.25” × 3/16” (184 × 184 × 4.8 mm), SSP9S – 9.00” × 9.00” × 3/16” (229 × 229 × 4.8 mm)
• Color: Red
• Shelf Life: Unlimited when stored below 100 °F (38 °C)