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mdpe

Medium-density polyethylene (MDPE) is a type of polyethylene defined by a density range of 0.926–0.940 g/cm3. It is less dense than HDPE, which is more common.
MDPE can be produced by chromium/silica catalysts, Ziegler-Natta catalysts or metallocene catalysts. MDPE has good shock and drop resistance properties. It also is less notch sensitive than HDPE. Stress cracking resistance is better than that of HDPE. MDPE is typically used in gas pipes and fittings, sacks, shrink film, packaging film, carrier bags, and screw closures.In the United Kingdom, black (or blue) MDPE is often used for water and waste water plumbing, and may also be referred to as 'black alkathene.'

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  1. T

    22mm MDPE connection

    I want to reconnect some outbuildings to an existing water supply. The supply pipe is old 22mm MDPE and buried for a fair distance so not going to dig it up and replace it 😬. Question is can I use normal 22mm plumbing push-fit connectors to make the connection as finding 22mm MDPE fittings...
  2. L

    MDPE - what diameter?

    We're in the process of doing grounds work for a new garden office, and unfortunately my go-to plumber is away and uncontactable at present. We need to lay a MDPE pipe for a cold water (only) supply for a WC and basin, as well as a second pipe to bring a bore hole feed up to a higher level in...
  3. A

    MDPE pipe concrete slab

    Hi, In the process of a new build and we have routed a MDPE pipe through a lintel in the DPC but unable to bend it to the correct location due to the bend radius. I have now made the bend radius suitable for the bend but the pipe has no support underneath. Will it be better to put in a 90 degree...
  4. Antony_0

    20mm MDPE to 25MDPE (and 22mm Copper)

    Hi all, we're doing some renovation work to our property and we wanted to install a sauna house (includes shower) in the garden, irrigation system and outside tap. I've ran a 25mm MDPE from the inside utility room where the main stopcock comes into the house. I originally thought that it was a...
  5. R

    MDPE to copper lever valve

    I would like to fit a full bore quarter turn valve that takes 25mm MDPE on the inlet and 22mm copper on the other side. I can't seem to find one, but surely they exist - has anyone come across one? I need to replace a seized stopcock on a 25mm blue MDPE supply pipe to 22mm copper internal...
  6. C

    32mm MDPE supply pipe upgrade for flow?

    Hello all, Currently suffering from poor internal flow rates near the internal 20mm stopcock of 10L/min. Want to upgrade system to either unvented cylinder or large storage combi to feed 5 bedrooms/1 bathroom/1en suite. Affinity water have confirmed supply pipe to the boundary stopcock is...
    • Cockneydave
    • Thread
    • america flow mdpe pipe supply supply pipe upgrade usa
    • Replies: 4
    • Forum: USA
  7. H

    Water Filter System

    Hi, I'm about to install a UV water treatment and filter system with 3/4" brass connectors. So I need to buy MDPE pipe connectors, bends etc. I wondered what folk thought about Plasson, FloPlast, Other connector types, especially the plastic to copper connectors, which I believe strip easily...
  8. K

    25 or 32mm MDPE

    Hi, we are having our driveway replaced and want to take the opportunity to replace the underground water supply pipe with MDPE at the same time. The pipe runs under our drive and then branches off to supply 3 other houses (so supplying 4nr 3 bedroom houses total). The current pipe is c27mm OD...
    • Karmann
    • Thread
    • america mdpe usa
    • Replies: 11
    • Forum: USA
  9. A

    MDPE fitted to garden tap - help

    I am trying to fit MDPE 20mm pipe to a threaded garden tap for the water source for garden irrigation, it always leaks from the MDPE fitting - i have tried various adaptors, what am i doing wrong? thank you
    • ashesofroses
    • Thread
    • america fitted garden garden tap help mdpe tap usa
    • Replies: 1
    • Forum: USA
  10. L

    What type of pipe is this, and what is the equivalent in internal diameter in MDPE?

    Hello, We have to replace a water pipe because it has a leak after the Thames Water connection to our property (residential block). The pipe that needs to be replaced has an external diameter of 50mm, and prior to entering the building it becomes a 30mm external diameter pipe. What type of...
    • LordWest
    • Thread
    • america diameter internal mdpe pipe usa
    • Replies: 9
    • Forum: USA
  11. W

    Mdpe to mlcp adapter 25x25

    Is there an easy way to get from 25mm mdpe to 25mm mlcp?
    • WC1
    • Thread
    • adapter america mdpe usa
    • Replies: 4
    • Forum: USA
  12. M

    using mdpe pipe

    Hello, Would someone be able to tell me how much (%) the job rate will change if water installations are done with MDPE instead copper? Also is there a preferance and why? Thank you!
    • MildaKli
    • Thread
    • #copper #mdpe america mdpe pipe usa using
    • Replies: 1
    • Forum: USA
  13. P

    Stop tap stuck in blue MDPE pipe compression fitting, nuts undone top pipe moved out the way howerver the tap is stuck in pipe, do I just give a bit

    Hello ,trying to change stop tap it come up from floor in garage ,The tap is stuck in the blue MDPE PIPE.. its compression fitting , the nuts have been undone and the top pipe is out the way ,however the tap is stuck in the blue pipe. Do I just give it a bit more of a pull?
    • Phililp
    • Thread
    • america compression fitting mdpe moved pipe stop tap stuck tap top usa
    • Replies: 9
    • Forum: USA
  14. G

    water supply sealing product

    Hi guys, organising a new water supply to my property, specs require a seal between the MDPE 25mm pipe and 50/63mm ducting, can't use builders foam and i can't find a product for this (severn trent shows what looks like a rubber reducing seal but i can't find it on any site
    • gator
    • Thread
    • ducting find mdpe product seal sealing supply water
    • Replies: 1
    • Forum: Ireland
  15. D

    20mm mdpe hot water under patio? Yes or no ?

    Hi everyone Whilst having an extension built 15 years ago I ran x2 20mm mdpe pipes under the patio to run hot and cold from my existing system to the extension. The time has come to utilize the extension and I would like to start preparing the services in the extension. I have read that mdpe...
    • Dickymint
    • Thread
    • america hot hot water mdpe under usa water
    • Replies: 8
    • Forum: USA
  16. M

    Does mdpe need to be insulated as it comes up to the surface from 750mm?

    Hi, does the mpde supply need lagging as it comes back up to the surface from 750mm down and if so what should I use? Also part of the run can be along a wall to cut down on digging, will armaflex be ok to insulate it? Thanks in advance! Mike
    • Mike_1605
    • Thread
    • america comes insulated mdpe surface usa
    • Replies: 5
    • Forum: USA
  17. N

    New supply into field

    Hi I have a small field with a static caravan on it. The water company are coming out in a few weeks to connect up a supply. So far I have a 90cm trench from just outside the boundary to 12 feet inside. I plan to run 25mm mdpe pipe along this to a standpipe. I'm not ready to run all the way...
    • NotAPlumber2
    • Thread
    • america field mdpe new supply usa
    • Replies: 4
    • Forum: USA
  18. James Cullinane

    MDPE Pipe to 22mm

    Hi all So I am replacing a lead pipe in my property, and advise from another member was to replace the stopcock etc to 22mm instead of 15mm. I was looking at the pipe coming from the road and it is a blue pipe, which was put in around 2 year ago. I presume this means it is MDPE? Would the...
  19. L

    MDPE pipe and fittings, are all equal? What durable brands to buy?

    Dear All, Whenever possible I aim to buy the correct quality product the first time round. Plumbing labour and water damage is expensive, thus, very happy to pay quite a bit more for materials provided it is needed to ensure a lasting product over time. Your advice will be much appreciated...
  20. R

    Flow rate of 20mm MDPE

    Hi Not sure if this is the right forum but i wanted advise on flow rates coming into a house. I have an incoming blue MDPE 20mm pipe that terminates into some kind of connector that goes to 15mm copper. From here into a stop tap and then to the rest of the house. Testing the flow rate at...
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