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All Categories > Fire Protection Products > STI Spec Seal > Pensil 300 Silicone Sealant  
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Pensil 300 Silicone Sealant

Pensil PEN300 Silicone Sealant is a one-part neutral curing silicone sealants exhibiting superior performance in applications where sealing apertures in walls and floors are needed to control the spread of fire, smoke, toxic gasses, and water during fire conditions. Pensil PEN300 Silicone Sealant reacts with atmospheric moisture to form a tough durable seal that will adhere to most building substrates without the use of primers. Pensil products do not contain asbestos or PCBs.

Pensil PEN300 Silicone Sealant is designed for use in Underwriters Laboratories (UL) classified firestop systems. This material can also insulate openings to prevent damage from occasional water spillage and dust penetration in sensitive areas. Pensil PEN300 Silicone Sealant is available in non slump (PEN300) and self-leveling (PEN300 SL) grades and may also be used to seal vertical and horizontal joints between metals, masonry, concrete and other common construction materials. Pensil 300 is specially designed for use in static or dynamic joints. The low modulus characteristic minimizes strain on the substrate surface and the elastomeric quality allows excellent recovery from extension and compression cycling.

Item #

Product Name


Unit Quantity


SSPEN300.SC Pensil 300 10oz Standard Cartridge Per Cartridge in Boxes of 12 1 lb Per Cartridge
SSPEN305.5G Pensil 300 5 gallon pail Per Gallon In 5 Gallon Pails 55 lbs. Per Pail


STI Pensil 300 Silicone Sealant Data Sheet

STI Pensil 300 Silicone Sealant MSDS