01
Co-extruded two-layer, gas
black PE100 · yellow PE100-RC skin
The skin marks the line as gas and absorbs the impacts and scratches of installation.
03HDPE100 WATER/GAS · PE100-RC
Co-extruded layer pipes
Two-layer pressure pipes for water and gas: a PE100 load-bearing wall and a PE100-RC protective skin, formed in a single extrusion pass.
ГОСТ 18599-2001 · СТ РК ГОСТ Р 50838-2011Ø200–630 mmPE100 / PE100-RC
Selected sizeSDR17
Ø630 mm
Wall 37.4 mm
Wall 37.4 mm
630mm
Pictured: waterSDR
SDR17
Pressure
10 atm
Wall thickness
37.4 mm
Layers
2- and 3-layer
Choose a diameter
9 sizes · in stockNeed another diameter, class or coil supply? Request a quote →
What we make
Two- and three-layer co-extruded pipe
The layers form together in the hot melt during extrusion, so there is no bond line to delaminate. The two-layer build carries a protective outer skin; the three-layer build adds an inner one. Diameters 200–630 mm, for water and for gas.
02
Co-extruded two-layer, water
white PE100 inner layer · black wall
The white inner layer shows on the cut face — direct proof the stock is virgin, since recycled material is always black.
03
Co-extruded three-layer, gas
yellow skin · black PE100 · yellow inner layer
Colour outside and in, so the pipe reads as gas from either side of the cut.
04
Co-extruded three-layer, water
blue skin · black PE100 · blue inner layer
The same build in water marking.
About the product
How does a co-extruded pipe differ from a standard HDPE pipe?
A standard HDPE pipe is single-layer. A co-extruded pipe is formed in two layers at once: roughly 90 % of the wall is PE100, and about 10 % is an outer skin of PE100-RC, resistant to slow crack growth and point loading. The layers fuse in the hot melt during extrusion, so there is no delamination boundary — it is one wall, not a coating. For water mains the inner layer is white virgin PE100: the white colour is visible on the cut face and is direct proof that the raw material is not recycled (recycled stock is always black). For gas the inner layer is black and the outer 10 % is yellow. The practical payoff is laying in stony bedding, trenchless methods (HDD, relining) and much better scratch resistance during installation. Pipe-Plast produces co-extruded pipes d200–630 mm — the only such production in the region.
Trunk water and gas mains in difficult soils, trenchless installation (HDD, relining, rehabilitation), laying without sand bedding, and sections with a high risk of mechanical damage.
Applications
Difficult soils
Laying into stony ground without sand bedding.
Trenchless installation
HDD, relining and rehabilitation of existing networks.
Water and gas
Drinking-water mains and gas pipelines up to 10 bar.
Order terms
- Minimum order — from 200 linear metres.
- Production lead time — 2–5 working days.
Buyer's guide01 02 03 04 05
When do you need a co-extruded pipe instead of a standard one?
A standard single-layer PE100 pipe covers conventional installation completely: a trench, a sand bed and backfill free of stones. A co-extruded pipe is for cases where the wall works in contact with aggressive soil — gravel, rock, construction debris — and for trenchless installation, where the pipe is pulled through and scrapes against the borehole wall.
The outer 10 % of a co-extruded pipe is made of PE100-RC, a material with increased resistance to slow crack growth. It is exactly the point load from a stone and the scratch made during installation that eventually destroy an ordinary pipe; PE100-RC removes that scenario. If the project allows installation without a sand bed, the saving on earthworks usually outweighs the price difference of the pipe.
Why does white layer = virgin raw material?
Virgin polyethylene granules are white; recycled material turns black during reprocessing. The visible white inner layer is an honest quality signal from the plant — it cannot be faked using recycled raw material.
How does a co-extruded layer differ from a polypropylene sheath?
Co-extrusion means two polyethylene layers formed simultaneously in the hot melt on the extrusion line. The layers are fused together, there is no delamination boundary, and both layers count towards the design wall of the pipe. A polypropylene sheath is applied cold on top of a finished pipe and does not count towards the design wall — it works as a replaceable protective jacket 1.5–2 mm thick.
In practice the choice is this: co-extrusion when you need the wall material itself to resist cracking and point loads; a PP sheath when the pipe will be abraded during pulling and surface protection matters most. Pipe-Plast produces both designs in diameters of 200–630 mm; a manager can advise which suits your installation method.
How are co-extruded pipes welded?
Exactly like ordinary PE100 pressure pipes — butt fusion from d63 upwards and electrofusion at tie-ins and in chambers. The outer PE100-RC layer is weld-compatible with the base polyethylene, so no separate equipment, no special parameters and no stripping of the layer are required.
The only things to watch are the usual facing of the pipe ends and matching SDR classes of the pipes being joined. A butt-fusion joint is stronger than the pipe itself, so the two-layer design creates no weak point at the joint.
What sizes and documents are available for co-extruded pipes?
Pipe-Plast produces co-extruded pipes in diameters of 200–630 mm; the common class is SDR17 (10 bar working pressure), with SDR13.6 and SDR11 available to order. For water supply the inner layer is white (virgin PE100) and the outer layer black; for gas the inner layer is black and the outer layer yellow.
Water pipes are supplied to GOST 18599-2001 / ST RK ISO 4427-2014, gas pipes to ST RK GOST R 50838-2011 / ST RK ISO 4437-2014. Every batch comes with a quality passport and a certificate of conformity — the package is suitable for tenders and public procurement.
- In-house manufacturing
- On the market since 2008
- 50-year service life
- Certificates & GOST
Manufacturer pricing
We will price it for your diameter and volume
Price depends on the product spec. Call or leave a request — our team will pick the diameter, stiffness and quantity and arrange delivery.