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

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