Polyethylene
Polyethylene is used extensively for fabrications and pipeline systems in water drainage, water supply & gas supply systems. Polyethylene has a large operational temperature range and a low specific weight. The material has excellent chemical resistance and a high abrasion resistance. Polyethylene can be readily joined using butt fusion, socket fusion and electro-fusion welding techniques or mechanical assemblies.

HDPE, MDPE & HPPE
Polyethylene (PE) is usually referred to as High Density (HDPE) or Medium Density (MDPE). For use in a landfill application either HDPE or MDPE is generally considered acceptable. The material used in the manufacturing process of HDPE and MDPE pipe and fittings is generally PE80.
HPPE is a high density polyethylene. HPPE pipe and fittings are manufactured from a PE100 material which provides a greater strength than PE80 with an equivalent wall thickness. The material is accordingly known as a High Performance Polyethylene.

SDR Rating
The wall thickness of PE (HDPE, MDPE and HPPE) pipe is referred to as the SDR (Standard Dimensional Ratio). The SDR is the pipe's wall thickness in relation to it's outside diameter. For most gas & water applications either an SDR 17.6 or SDR 11 material is normally specified.
Example 1. 　　A 110mm outside diameter pipe with an SDR rating of 11 will have a wall thickness of
　　　　　　　 　10mm and therefore an inside diameter of 90mm.
Example 2. 　　A 250mm outside diameter pipe with an SDR rating of 17.6 will have a wall thickness of
　　　　　　　 　approximately 14.2mm and therefore an inside diameter of approximately 221.6mm.

Pressure Rating
For PE80 (MDPE and HDPE) material an SDR rating of 17.6 provides a pressure rating of PN6 (6 bar) and an SDR rating of 11 provides a pressure rating of PN10 (10 bar). For PE100 material SDR ratings of 17.6 and 11 provide pressure ratings of PN10 and PN16 respectively.
We will be pleased to quote for supplying any non-standard and bespoke fabrications.