Backer Rod - Polyethylene Backing Rod

A synthetic cell foam that comes in a variety of shapes and sizes from 1/4" up to 6". It is a cylindrical, flexible sealant backing composed of closed and open cell material per ASTM C1330. Backer Rod limits the depth of sealant and prevents excessive use of caulking.


  • Glazing Operations
  • Window & Door Applications
  • Expansion Joints
  • Curtain Wall Joints
  • Partitions
  • Log Construction
  • Pavement Joints
  • Repairs
  • Precast Units & Copings


  • Easy to Apply
  • Non-Exuding
  • Dust Free
  • Non Gassing



Property Value Test Method
Density (nominal) 1.75 lbs/cu.ft. ASTM-D-16672
Tensile Strength 24 psi ASTM-D-1623
Compression Deflection 5 psi @ 25% ASTM-D-1621
Water Absorption (1) 0.03 gm/cc ASTM-C-1016
Water Absorption (2) 0.02% by volume ASTM-C-509
Temperature Range -55deg F - 150 degF N/A


*As determined by independent laboratory testing. Complete test report available on request.

Water Absorption (1) "Determination of water absorption by sealant (joint filler) materials.”

Water Absorption (2) Standard specification for cellular elastomeric preformed gasket and sealing material. Historic standard no longer applicable to backer rod.



STANDARD BACKER ROD INSULATION is compatible with modified polyurethane, butyl, acrylic, polyurethane, silicone and most other cold sealant compositions. polysulfide, acrylic, polyurethane and silicone.



The XB9500 is available for the following industries


Available in a variety of configurations, sizes and packages. Please contact your sales representative for exact sizes.


Limited Lifetime Warranty

This product is guaranteed to give satisfactory performance if applied in accordance with the label directions. Liability to Premier Industrial Supply, Inc. (Premier) is limited to a full refund of the purchase price or product replacement if product is proven defective. Premier shall not be liable for loss or damage, whether direct, consequential or incidental. There are no other warranties expressed or implied including the implied warranty of merchantability or fitness for a particular purpose.