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FILL-RITE 4-INCH Closed-Cell Backer Rod (9 units of 4" x 72") 54 Feet

FILL-RITE 4-INCH Closed-Cell Backer Rod (9 units of 4" x 72") 54 Feet

Regular price $179.99 USD
Regular price Sale price $179.99 USD
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Do you want to know the best thing about our 9 units of grey 4” x 72” FILL-RITE 4-inch closed-cell backer rods? Their construction is resilient and compatible with most known cold-applied sealants! That means these 4-inch concrete backing rods are perfect for several different environments. Reach out for more information about our options of backer rods!

Box of 9 units of 4" x 72" grey foam solid. Total of 54 feet.

Closed Cell Polyethylene Foam

Meets SATM C1330 Type C

Made without CFCs or HCFCs


Backer Rod is a closed cell, resilient, polyethylene backer rod used as a backup material for construction joints and applications that require sealants. It performs as a depth control for most known cold applied sealants. Sealants will not adhere to it; no bond breaker is required.


Backer Rod is a round, black, resilient, extruded closed cell polyethylene backer rod with a water resistant outer skin. It is compatible with most known cold applied sealants such as urethane, silicone, acrylic, butyl, polysulfides, latex, and chinking sealants.

Backer Rod is chemically inert and will resist gasoline, oil, and most solvents. Product will not stain or adhere to sealants.


  • Expansion joints.
  • Highway joints
  • Glazing
  • Log home chinking
  • Parking Decks
  • Window and door applications
  • Partitions


Backer Rod should be installed with a roller or blunt, flat-sided tool. Please follow sealant manufacturer specifications for recommended sealant width and depth ratio. For best results, do not puncture, fold or overly stretch the product. The product is made with a water-resistant outer skin, therefore where moisture resistance is important, care should be taken not to puncture this outer surface skin.


Density: 1.3-1.9 lbs/ft3

Water Absorption: ?less than 0.5% by volume

< 0.03 grams/cc

Temperature range: -90F to 190F

Compression Recovery: > 90%

Compression Deflection: 5 psi

Tensile Strength: > 29 psi

Meets standards ASTM D5249 type 3 and ASTM C1330 type C

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