Sub-Product

Modified PVC products are thermoplastic alloys formed by the addition of compatible modifying agents to PVC. The modifying agents improve toughness, impact properties and resistance to crack growth that improves the fracture toughness and ductility of the material. This enhanced toughness enables modified PVC pipes to be manufactured with a thinner wall, with subsequent material savings and improved hydraulic properties. The alloying of PVC with modifying polymers achieves improvement in resistance to cracking. The result is the minimisation of the effect of stress concentrators such as scratches.

PVC-HI stands for High Impact PVC. The PVC-HI grade is obtained by adding an impact modifier to PVC-U that increases the resistance of the pipes to external blows.

PVC-HI shall have one of the following compositions:

1. a mixture based on PVC
2. a blend based on PVC
3. a copolymer based on PVC
4. a Ccmbination of these Types

The proportion of the impact modifier in the composition shall be at least 7 weight-%.

Source: PVC4PIPES, PVC pipe categories.