As a general rule, higher the density, the better will be the product. The screw holding capacity, the resistance capacity and flexural strength all depend upon the density of WPC material. The minimum density required for a good quality WPC is .60 gm/cm3.
1. For WPC boards - the quality of foaming, surface hardness, thickness and density should be considered for check. Density should play around 550 kg/cum for reasonable screw holding.
2. For WPC door frames – density, dimensional stability and colours should be checked. Density should be around 750 kg/cum for better screw holding.
3. For WPC decking – the quality of surface (with sanding/embossing/brushing), thickness, colour, dimensional stability and impact strength should be checked.
The extrusion process allows nearly 100% material usages, there is almost no waste of the recycled input materials used in making WPC. Also, it is free from emissions.