Explained & Solved: Black & Blue MDPE Sizing Differences


What we know today as MDPE was first given the commercial name of alkathene, introduced in the 1930’s. It’s used in a range of applications and because it’s not prone to stress cracking, rotting or corrosion and is inert (so it doesn’t support the growth of  fungi and bacteria), it’s the material used to transport water.

If you’re reading this, it’s likely you’ve had an unpleasant discovery while carrying out landscaping or groundworks recently – Black MDPE. Plastic pipes aren’t always covered on surveys which means you can sometimes find yourself in a challenging situation having broken through an old water pipe.

To make matters more frustrating, the diameter is often slightly different to the more commonly known blue MDPE which makes finding the fittings, couplings & adaptors can be a challenge.

Every now and then we’ll get a phone call or a visit at our Trade Counter from an existing or new customer with the same challenge, that’s why we’ve included a handy conversion chart below for you to find out what you need to look for.

Take a look at the sizing chart and if you have any questions feel free to call us on 01285 700488 for help to find the fitting you need.