Hello,

I am working on a product that requires a PVC (shore 70) overmold. The product requires a air tight bond between the substrate and the overmold and is subject to small mechanical loads. The product is also exposed to outdoor environment (UV and water). Unfortunately the molds have already been produced and limit my options for adding a interlocking mechanical feature to only a few points but not along the entire interface. I am looking to develop a bond between the substrate and overmold materials. Currently the substrate is POM ... im sure you all know that this will not form a good bond. Does anyone have recommendations for a different substrate material I could use that would produce a good bond with the PVC overmold material.

Also I would appreciate any recomendations on processing or design to promote good overmold bonding. For example substrate surface texture, cleaning, molding machine settings, etc.

Any help would be greatly appreciated.