Nomaco 337-91-0375-0 3/8" HBR Backer Rod (Carton of 2 ea. 1800 LF Spools)

Nomaco 337-91-0375-0 3/8" HBR Backer Rod (Carton of 2 ea. 1800 LF Spools)

HBR® is a closed-cell polyethylene foam backer rod used in building envelope and concrete construction. HBR acts as a barrier, limits the depth of cold-applied sealant required and prevents excessive sealant use.

PERFORMANCE
HBR limits the amount and depth of sealant applied into a joint and provides a form to assist cold-applied sealants in developing the proper shape factor to prolong the sealant service life. HBR acts as a bond breaker to allow joint movement without undue stress to the sealant. 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. HBR can be used without a bond breaker with no impact on the long term performance of the sealant.

INSTALLATION
Prior to installing HBR, the joints should be cleaned per the sealant manufacturer’s recommendations. Thoroughly remove any concrete form-release agents, curing compound reside, laitance or any foreign materials. To ensure a good sealant bond, joints must be clean and dry when the new sealant is installed. Air compressors used for this purpose must be equipped with traps for removal of oil and moisture. Install HBR with a blunt tool to the depth recommended by the sealant manufacturer.

Care should be taken not to puncture or over-compress HBR during installation. Proper size selection is important as it controls the depth of the sealant bead. It must be oversized (25-50%) to fit tightly into the joint and function as a bond-breaker to prevent back-side adhesion of the sealant. HBR is not meant to be used with hot-pour sealants.

DESCRIPTION
FORM: Round Foam Rod.
TYPE: C - Per ASTM C 1330. Cylindrical, flexible sealant backings composed predominantly of closed cell material per ASTM C 1330 for use with cold applied sealants.
TYPE: 3 -Per ASTM D 5249. Round rods of various diameters for use with cold-applied joint sealants.
TEMPERATURE LIMITS: -45˚F to +160˚F.

WARNING: California's Proposition 65