Weatherstrip with substrate of two different materials

A flexible material for use as weatherstripping comprising a flexible substrate of woven strands of material;

• a pile strip of resilient fibers upstanding from said substrate, secured thereto and extending longitudinally of said substrate;
• and a barrier strip of impervious, flexible sheet material located within or immediately beside said pile strip, secured to said substrate and also extending longitudinally of said substrate;
• said strands of said substrate being composed of at least first and second different polymeric materials and a structural integrity maintaining material;
• said first polymeric material being a heat sealable material, being the same material as that of said barrier strip, being located in a region adjacent to said pile strip and extending longitudinally of said substrate to provide a region in said substrate to which said barrier strip is heat sealed;
• said second polymeric material and said structural integrity maintaining material being located laterally on either side of said region;
• said second polymeric material being a thermoplastic material distributed throughout said substrate in such a way that when said thermoplastic material is melted and then solidified, said strands of material become bonded together so that said substrate can be cut without fraying of the resulting edge, said thermoplastic material located laterally on either side of said region also being located at least on the side of said substrate opposite from the side from which said fibers upstand to provide a surface which can be heat sealed to compatible material;
• said structural integrity maintaining material being distributed throughout said thermoplastic material in such a way that when said thermoplastic material is melted, said structural integrity maintaining material preserves the structural integrity of said substrate.