Polywater® FST-250 Foam Duct Sealant


Typical Lead Time 7-10 days. Note that this product is only sold in multiples of 12.

SKU: FST-250 Categories: ,


FST™ closed-cell duct sealant provides superior pressure-blocking power in the toughest environments. It stops methane and other gases to keep electrical systems intact. FST Duct Sealant is stronger, more chemically resistant, and cures 50 times faster than open-cell aerosol foams. The FST seal has excellent adhesion to PVC, rigid steel, EMT, IMC, fiberglass and polyethylene conduits. FST is a proven solution that has been used for years to protect switchgear, panels, riser poles, combiner boxes, meters, and all types of electrical and telecommunication apparatus. It creates a semi-permanent seal and is reenterable.

Polywater FST is recommended for 2-inch (51 mm) or larger conduits. It comes in a multi-use single-plunger caulking tube that uses a standard high-ratio caulking tool (TOOL-250). For smaller conduits the Polywater FST MINI is recommended (see sidebar). The kit packages come with all the components needed to complete a proper seal.

FST-250 includes:

  • 1 – 8.5-oz two-part FST Foam Sealant caulking tube
  • 1 – mixing nozzle
  • 1- resealing cap

Additional information

Dimensions14 × 10 × 11 in