Polywater® FST-MINI-B6G


Lead Time: 7-10 days.

SKU: FST-MINI-B6G Categories: ,


6 FST-MINI plus 1- TOOL-50-11. 1 FST-MINI-1 includes:

  • 1 - 50-ml cartridge
  • 2 - mixing nozzles
  • 6 - foam discs
  • 1 - pair of disposable gloves
  • 1 - instruction sheet
  • 1 - TOOL-50-11

A Foam Duct-Sealing System for Conduit Sizes 3/4″ up to 1.5″

Polywater® FST MINI is an expanding, quick-setting, “closed-cell foam”, which is injected into a conduit to provide a watertight seal. The seal is superior to pliable duct putties and “open-cell” aerosol canned foams. Polywater FST MINI comes in a kit that contains side-by-side cartridges filled with the two-part foam base. The two resins are mixed in equal parts as they are pushed through the mixing nozzle. Once injected, the foam expands and hardens, keeping water, acids, greases, gases, insects, and rodents, etc., out of the conduit. The foam has good wetting and adhesion to metals, plastics, and concrete. A special ratchet tool is used to inject the foam from the side-by-side cartridges.

Polywater FST MINI meets and exceeds all of the NEC code requirements for sealing conduit:  2011 NEC Articles 225.27, 230.8, 300.5 (G), 300.7 (A) on Raceway Seals, and 501.15 (B)(2).  It also meets Class 1, Div 2, cold storage entrances approximate R-Value of 6.5 per inch.

Product/Package Notes:

  1. Polywater FST MINI is recommended for small conduits (less than 1.5 inches (38 mm). For larger conduits the FST-250 is recommended.
  2. It comes in a side-by-side 50-ml cartridge with 1:1 ratio.
  3. A TOOL-50-11 is needed to apply FST MINI.
  4. One Polywater FST MINI cartridge seals approximately ten 1-inch ducts (25.4 mm)
  • Strong: Holds up to 22ft/7m of water head pressure.
  • Compatible: PVC, rigid steel, EMT, fiberglass, and all other conduits.
  • Easy: Two-part foam is mixed in nozzle as it is injected into duct.
  • Quick: Foam expands and cures quickly even when water is present.
  • Multi-Use: Packages are resealable.

Specifications and Applications:

Codes: Polywater FST Sealant meets NESC code sections 322 B4 and 355 D; and 2008, 2011, 2014, and 2017 NEC conduit sealing code requirement Articles 225.27, 230.8, 300.5 (G), 300.7 (A) on Raceway Seals, and 501.15 (B)(2).

Water Blockage: Holds 22 feet water head pressure continuous: 70 feet water head intermittent.

Seal Strength: Sealant can seal out manhole gases, such as methane.

Chemical Resistance: Chemically resistant to gasoline, oils, dilute acids and bases, and most unsaturated hydrocarbons.

FST Calculator
Weight 11 lbs
Dimensions 15 × 11 × 9 in

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