Seal-it® 540 BACKER ROD FOAM

Seal-it® 540 BACKER ROD FOAM is an open-celled, CFC-free, polyurethane-based backer rod foam available in many diameters. Suitable for filling excessively deep and wide joints to achieve proper joint dimensioning. Also, Seal-It Backer Rod Foam prevents three- sided adhesion in joints.

Seal-it® 540 BACKER ROD FOAM is an open-celled, CFC-free, polyurethane-based backer rod foam available in many diameters. Suitable for filling excessively deep and wide joints to achieve proper joint dimensioning. Also, Seal-It Backer Rod Foam prevents three- sided adhesion in joints.

Seal-it_540_02

Applications

  • For achieving the optimal joint depth/width ratio, for proper joint dimensioning.
  • To prevent three-sided adhesion in dilation joints.
  • PU open-cell backer rod foam (polyurethane) is used for non-load-bearing joints.
  • PE closed-cell backer rod foam (polyethylene) provides additional support to the sealant and is therefore better suited for joints under mechanical loads or water pressure.

Properties

  • CFC-free.
  • No bubble formation when using PU open-cell backer rod foam.
  • Risk of bubble formation when using PE closed-cell backer rod foam.
  • PE closed-cell backer rod foam is 100% airtight.
  • High specific weight, heavy A- quality.
  • Lasting resistance to ageing; does not rot.
  • Easy to compress and install.
  • Compatible with all surfaces and sealants.

Application conditions

  • The diameter of Seal-it® 540 backer rod foam must be between 30% and 50% greater than the width of the joint being sealed. This ensures secure installation of the backer rod foam in the joint and prevents sagging during sealant application.
  • Do not stretch backer rod foam during application.
  • Connect the backer rods together with a bit of overlap.
  • For joints under mechanical loads or water pressure, use PE closed backer rod foam, as this provides additional support for the sealant. If using PE closed-cell backer rod foam, air may become trapped between the sealant and backing during application, which, in combination with direct sunlight, may result in bubble formation in the joint seal. Use of PU closed-cel backer rod foam does not run this risk.

Assortment

Diameter Contents bundle Article number
10mm 500m SI-540-0010-500
15mm 250m SI-540-0015-250
20mm 200m SI-540-0020-200
25mm 100m SI-540-0025-100
30mm 100m SI-540-0030-100
35mm 50m SI-540-0035-050
40mm 50m SI-540-0040-050
50mm 50m SI-540-0050-050
60mm 25m SI-540-0060-025
70mm 25m SI-540-0070-025
100mm 15m SI-540-0100-015

Packaging:
Bundle

SI-XXX-XXXX-XXX = Item number.