Nelson PLW™ Firestop Pillows

Reusable, Non-Toxic, Intumescent


What's special about these barrier pillows?

  • Designed to lock and seal in place when exposed to fire, preventing the spread of flame and smoke
  • Up to 3-hour fire rating complies with ASTM E119 and UL263 for building construction materials
  • The easily compressed material provides quick and easy installation in tight spaces
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ULFM Approved

Nelson PLW™ Firestop Pillows are ideal for permanent firestopping in locations where changes in cabling or cabling pathways are frequent. The compressible material allows you to easily install as many or as few as needed, and require no caulk or putty to hold them in place.

Part #DescriptionDimensionsWeightPrice
NFS-AA478Small Nelson PLW Firestop Pillow3" x 4" x 9.6"0.5 lb
Manufacturer Direct
NFS-AA479Large Nelson PLW Firestop Pillow3" x 8" x 9.6"1 lbs
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  • Simple design is constructed of specially treated mineral fiber that is enclosed in a strong polyethylene bag
  • Non-toxic-emits no toxic or hazardous fumes
  • Reusable, making it ideal for maintaining the fire rated integrity of wall and floors in both temporary and permanent installations
  • Unlimited shelf life prevents your products from expiring prior to use
  • Easily penetrated, so cables or wires can be inserted without removing the PLW™
  • To ease installation in especially tight spaces, a cable pulling lubricant can be used


Ideal for use:

  • Steel and Aluminum Cable trays
  • Wire ways
  • Through wall applications
  • Temporary closures



Color Safety Orange
Asbestos Filler None
Solvents None
Hazardous Ingredients None
Activation Temperature Initial > 275°F (135°C)
k - Value 0.25 BTU in./hr. sq. ft. °F
Polyethylene Thickness 4 mils
Test Compliance ASTM E119 and UL263, Fire Tests of Building Construction and Materials
ASTM E814 and UL1479, Test method for through stop fire penetrations.
Approvals Underwriters Laboratories Inc., Fill, Void or Cavity Material (XHHW) and (XHHW7), Factory Mutual
Testing Data For specific test criteria, refer to the UL Fire Resistance Directory
Storage & Handling Nelson PLW™ should be stored in dry, covered locations at no greater temperature than 120° F
(49° C). There is no indication of shelf life limitations.
Limitations Nelson PLW™ should not be exposed to chemicals harmful to polyethylene. Service temperature shall not exceed 275ºF (135ºC).







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