Created with Eselt - eBay Listing Template Editor eBay.co.uk Give us a call Send us a message Created with Eselt - eBay Listing Template Editor - Our Store - Seller Profile - Feedback - About us - Contact Created with Eselt - eBay Listing Template Editor CROMAR AlphaChem Joint Backer Rod Closed Cell Polyurethane Expansion 15mm x 550m Introduction The CROMAR Joint Backer Rod is a closed cell polyurethane foam rod designed to serve as an essential backing material in expansion joint sealing. It prevents three-sided adhesion, ensuring optimal sealant performance and longevity. Whether you're working on a construction project or a DIY repair, this backer rod simplifies the sealing process by providing a flexible, easy-to-use solution that.