Denver Foam Open Cell Backer Rod

DENVER FOAM® OPEN CELL BACKER ROD – POLYURETHANE SEALANT BACKING Improve joint performance and reduce sealant waste with Denver Foam® Open Cell Backer Rod. Designed to control sealant depth and create the ideal hourglass configuration, this backer rod ensures proper adhesion, flexibility, and long-term durability across a wide range of applications. KEY FEATURES Controls sealant depth: reduces excess sealant use and ensures proper joint design Open cell structure: allows air flow for complete two-sided sealant cure Enhances joint performance: promotes proper adhesion and cohesion No out-gassing: eliminates bubbling issues common with closed cell backer rods High flexibility: stretches up to 90% to accommodate joint movement Wide temperature range: performs from -60°F to +500°F APPLICATIONS Expansion and construction joints Concrete and precast walls Curtain walls and glazing systems Bridge and highway construction Parking decks and pavements Log home construction Saw-cut control joints PRODUCT DETAILS Material: open cell polyurethane Color: yellow Form: continuous round profile Chemical resistance: resists oil, gasoline, and most solvents Odor: odorless and non-staining PHYSICAL PROPERTIES density: 1.7 lbs/ft³ (ASTM D1622) tensile strength: 25 psi (ASTM D1623) elongation: 90% (ASTM D3574) air flow: 90% (ASTM D3574) water absorption: ≤ 0.107 g/cm³ (ASTM C1016 – Proc. B) compression set: ≤ 5% after 30 days (ASTM D3574) auto ignition: 700–800°F out-gassing: none (open cell design) PACKAGING compressed for shipping in super bundles available in master bags and mini bags color-coded by size for easy identification and distribution AVAILABLE OPTIONS Diameter Length Packaging 5/8" 2,000' Master Bag 7/8" 1,050' Master Bag 1-1/8" 600' Master Bag 1-1/2" 350' Master Bag 2" 200' Master Bag 7/8" 100' Mini Bag 1-1/8" 75' Mini Bag 1-1/2" 40' Mini Bag INSTALLATION NOTES Select a diameter slightly larger than the joint width for proper compression Install at the correct depth to achieve the recommended sealant profile Compatible with most elastomeric sealants (follow sealant manufacturer guidelines) LIMITATIONS Performance is subject to the limitations of the sealant used Always follow sealant manufacturer specifications for joint design and compatibility RESOURCES Denver Foam Product Information Sheet Denver Foam Technical Data Sheet General Certificate of Compliance Denver Foam Product Information Sheet - Spanish Denver Foam Technical Data Sheet - Spanish