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Nomaco HBR® 3/8" diameter closed-cell polyethylene foam backer rod is used in concrete construction. HBR® acts as a barrier, limits the depth of cold-applied sealant required and prevents excessive sealant use. Nomaco HBR helps cold-applied sealants assume the optimum hour glass shape to prolong the sealant service life. It is commonly used in applications such as expansion and contraction joints, curtain walls, construction partitions, parking decks and bridge construction. HBR® is an inert material, and therefore, it is physically and chemically compatible with virtually all known cold-applied sealants including self-leveling types. Sealant compatibility should be confirmed by the sealant manufacturer. Compatibility characteristics of sealants in contact with sealant backings can be determined by ASTM C 1087 test method.

  • Foam Type: Closed Cell
  • Sealant Use: Cold Applied
  • Joint Dimension: 1/4"
  • Absorption: Non-Absorption
  • Gassing: Out-Gassing
  • Temp. Range: -45°F to +160°F
  • Material: Polyethylene (PE)
  • Color: Grey
  • ASTM Type: C 1330 Type C
  • Lightweight
  • Water resistant
  • Non-exuding
  • Easy to use
  • Use with cold-applied sealants
  • Clean product
  • Inert
  • Recyclable
  • Made in USA
California Proposition 65 Warning: The following warning is a requirement of DHC Supplies to post on our website in order to sell the above product into the state of California.
Please view the current SDS sheet and visit the California Prop 65 Home Page for more information.
Prop 65 Warning label WARNING! This product can expose you to chemicals which are known to the State of California to cause cancer and/or birth defects. For more information go to

Please Note: Due to availability issues the brand and/or color of backer rod may be different than what is displayed on this page. If you do require a specific brand or color please call 800-323-2999 to verify what we have in stock.
Explanation of Product Availability Terms

  • Stock Item: This is a product we normally have available for immediate shipment. If we are out of stock or do not have enough to complete your order we will notify you by phone or email as soon as possible. If you need to know if we have it in stock before you place the order please call 800-323-2999 Monday through Friday 7:00AM - 4:30PM.

  • Ships Direct: This product ships direct from the manufacturer usually on the same or next business day.

  • Special Order: This product has to be special ordered into our store and then shipped to the customer. This can take form 1-6 working days depending on the item and manufacturer.

  • Out of Stock: This product is out of stock and will be replaced in the future.  Depending on the vendor we can sometimes have a product that is out of stock drop shipped direct to you. Please call 800-323-2999 if you have any questions.

  • Discontinued: These are products we are no longer stocking.  However they may be available as a special order.  Please call 800-323-2999 if you have any questions.

Please Note:  If we can drop ship an order and save shipping charges we will notify you and then pass the savings on to you.