Duraboard HD100 is a Cross linked Closed cell Polymer and widely known as compressible Expansion Joint Filler Board. It is flexible as well as has high compression-recovery, therefore suitable for application at places which require readily compressible low load. This filler board is non-tainting and therefore suitable for use in potable water retaining and water excluding structures. It contains no bitumen. The most compressible filler board for expansion joints Duraboard HD100′ is a high performance cross-linked, pre-molded, compressible joint filler board. It is readily compressible filler board that ensures low load transfer. ‘Duraboard HD100’ (expansion joint filler board) is a non-bituminous superior alternative to bitumen boards.