3 ms·
I think op may be referring to 'barrier pipe', which is a plastic -copper-plastic sandwich, which is designed to keep out pollutants which can diffuse through t
by londons_explore 3y ago
I think op may be referring to 'barrier pipe', which is a plastic -copper-plastic sandwich, which is designed to keep out pollutants which can diffuse through the plastic - eg. Diesel oil.
If you don't use it for underground water pipes in cities, you'll normally get complaints from homeowners about 'chemical smelling' water, particularly first thing in the morning when water has been sitting stationary in pipes all night.
- ClumsyPilot 3y agooh dear i forgot that plastics are permeable to petrochemicals lile paper is to water
- nate_meurer 3y agoThat's like saying "metal is strong". There are huge differences among different plastics.
- ClumsyPilot 3y agoWell, there are < 100 metals but thousands of varieties of plastic?
- nate_meurer 3y agoNot thousands, certainly not in common use. But yes there are many, and they have very different properties from one another, including permeability.
- Gibbon1 3y agoThere is a test for plastics where they weigh a block of plastic then soak it in water and weigh it again. For some plastics the gain in weight can be a few percent.
- fransje26 3y agoOooooohhhh.. That make sense. Today I learned.
- nate_meurer 3y agoBarrier PEX (often referred to as PEX-Al-PEX) uses a layer of aluminum, not copper. A far more common type of barrier PEX uses a low-permeability polymer coating.