MDPE, or medium density polyethylene, is ideal for water pipework as it is light, durable, and resistant to corrosion and stress cracking.
As a pipework system, MDPE was specifically designed to carry water for human consumption. Therefore, no contaminants can be present, either through the build-up of bacteria or from rust generated through corrosion. MDPE is manufactured with a smooth bore, to prevent the accumulation of bacteria. As a plastic, it obviously won't corrode, but it is also resistant to environmental degradation.
MDPE was previously known as alkathene, although that name is still used in the industry today, or is often shortened to just PE.
Chemical resistance guide
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