Sealant Backing Rod – Open Cell

Thermotec has acquired the Diameter Foam open cell backing rod business which was established in Adelaide in 1993. Thermotec and Diameter Foam customers throughout Australia will now have access to a full range of top quality Australian made open and closed cell sealant backing rods, from a single Australian owned and operated source.

Material Specification

Diameter Foam open cell backer rod is fabricated from medium density polyurethane foam supplied by Joyce Foam Products. The Foam grade is N31-320 and is orange in colour. It’s used in expansion / construction joints, tilt slab construction and caulking.

Product Range

Diameter Foam open cell backer is available in 6 different sizes.

10mm, 16mm, 22mm, 29mm, 38mm and 50mm.

Backer Rod Size and Quantities

Open cell backer rod is sold in varying lengths according to the size of the foam. Each length is packaged in a plastic bag and is then placed in a plastic master bag. Five master bags are then compressed into a strapped bale.





 10 mm

 210 m


 5,250 m

 16 mm

 150 m


 3,000 m

 22 mm

 100 m


 1,500 m

 29 mm

 60 m


 900 m

 38 mm

 30 m


 450 m

 50 mm

 20 m


 300 m