I Product Introduction
Pe-rt pipe/Pe-rt II pipe is a pipe manufactured using a high temperature resistant reinforced polyethylene material, non-crosslinked polyethylene.
PERT EVOH pipe is designed with resistance to light and oxygen to inhibit the microorganism and prevent the metals in the heating system from corrosion and rusting. This advantage greatly prolongs the lifetime of metal parts, such as the valve, switch, boiler, etc, and ensures the wide application in high end housing. It is used in ground heating system, drinking water piping systems and other applications.
I Product Description
PERT Five-Layer EVOH Pipe is a high-performance piping system manufactured using advanced five-layer co-extrusion technology, featuring a standard structure of: PE-RT / Adhesive / EVOH / Adhesive / PE-RT. The EVOH (ethylene vinyl alcohol copolymer) oxygen barrier layer is securely encapsulated between two adhesive layers, further protected by inner and outer PE-RT layers. This five-layer composite design ensures excellent oxygen barrier performance while protecting the EVOH layer from mechanical damage and moisture during installation. PERT Five-Layer EVOH Pipe is widely used in underfloor heating, radiator connections, low-temperature heating/cooling systems, and represents the ideal choice for premium projects demanding high system durability.
I Product Features
1. Five-Layer Structure with Superior Oxygen Barrier
PERT Five-Layer EVOH Pipe features a PE-RT/Adhesive/EVOH/Adhesive/PE-RT co-extruded structure. The EVOH barrier layer is tightly encapsulated between two adhesive layers, further protected by inner and outer PE-RT layers. This design ensures the EVOH layer remains undamaged during bending, laying, and floor covering installation while completely isolating it from moisture contact, maintaining the inherent high oxygen barrier properties of EVOH. Oxygen permeability can effectively prevent oxygen ingress and protecting boilers, valves, pumps, and other metal components from corrosion, extending overall system life.
2. Adhesive Layers for Enhanced Bonding
The two adhesive layers in the five-layer structure play a critical role: firmly bonding the EVOH layer to inner and outer PE-RT layers to prevent delamination, and buffering stress during pipe bending to protect the brittle EVOH layer from damage. This strong interlayer bonding ensures the pipe maintains structural integrity and stable oxygen barrier performance during long-term use.
3. PE-RT Base Material with Excellent Thermal Stability
Both inner and outer layers utilize PE-RT material, whose unique molecular structure provides excellent strength and creep resistance without cross-linking. PERT Five-Layer EVOH Pipe offers long-term operating temperature up to 70°C (application class 4), momentary maximum temperature 95°C, working pressure 6 bar, and design service life of 50 years.
4. Exceptional Flexibility for Easy Installation
PE-RT material offers excellent flexibility, allowing bending and installation even at low temperatures (-20°C) without preheating. The low elastic modulus enables easy bending around obstacles, reducing fitting usage and potential leak points. Pipes are supplied in coils, significantly improving installation efficiency.
5. Smooth Inner Wall with Minimal Scaling
PERT Five-Layer EVOH Pipe features a smooth inner wall (roughness only 0.007mm), providing low flow resistance and scaling resistance, maintaining high flow rates and efficient heat transfer during long-term use. Good thermal conductivity enhances heating system efficiency.
6. Chemical Resistance and Hygiene
PE-RT material resists acids, alkalis, and chemical corrosion, does not promote bacterial growth, is non-toxic and odorless, complying with drinking water standards. The EVOH layer is completely encapsulated and does not contact water directly, ensuring safe and pure water quality. Pipes can be directly embedded in concrete or walls without additional protection.
7. Multiple Connection Options
PERT Five-Layer EVOH Pipe supports various connection methods: crimp fittings, compression fittings, and push-to-connect fittings, providing flexible installation options.
I Technical Specifications
Parameter | Specification |
Structure | Five-layer: PE-RT / Adhesive / EVOH / Adhesive / PE-RT |
Material | PE-RT (Type I or Type II) + EVOH barrier |
Oxygen Barrier | Permeability < 0.1 g/(m³·d) (DIN 4726 compliant) |
Temperature | Long-term: 70°C; Momentary max: 95°C |
Working Pressure | 6 bar (at 70°C) |
Inner Roughness | 0.007 mm |
Min. Bend Radius | 5 × O.D. |
Connections | Crimp, compression, push-to-connect |
Standards | ISO 22391, DIN 4726, EN ISO 21003, GB/T 28799 |
Application Class | Class 4 (underfloor heating) |
I Product Specification
I Application
Application Field | Specific Applications |
Underfloor Heating | Floor heating systems in homes, apartments, villas |
Radiator Heating | Radiator supply and return connections |
Surface Heating/Cooling | Wall and ceiling radiant systems |
Residential Hot/Cold Water | Home water supply pipelines |
Commercial Heating | Hotel, office, shopping mall heating systems |
Snow Melting Systems | Ramp and driveway snow melting pipes |
I FAQ
1. What are the differences between the five-layer oxygen-blocking tube and the ordinary three-layer oxygen-blocking tube?
The five-layer oxygen-blocking tube adopts the structure of PE-RT/gel/EVOH/gel/PE-RT, while the ordinary three-layer oxygen-blocking tube has the structure of PE-RT/EVOH/PE-RT. The two layers of hot melt glue in the five-layer structure play a crucial role: one is to firmly bond the EVOH layer and the PE-RT layer to prevent delamination; the other is to buffer stress when the pipe bends and protect the brittle EVOH layer from damage. The five-layer structure is a more advanced oxygen-blocking tube design, especially suitable for high-end projects with strict requirements for system durability.
2. Why is a five-layer structure needed?
The EVOH material itself has certain brittleness and poor adhesion to PE-RT. The three-layer structure directly co-extruded may produce micro-cracks in the EVOH layer when the pipe is repeatedly bent or during low-temperature construction, affecting the oxygen-blocking effect. The five-layer structure uses two layers of hot melt glue as the "buffer layer" and "adhesive layer", not only enhancing the interlayer bonding force, but also protecting the EVOH layer during bending, ensuring long-term stable oxygen-blocking performance.
3. How is the oxygen-blocking performance of the five-layer oxygen-blocking tube?
The oxygen permeability of the five-layer oxygen-blocking tube strictly complies with the DIN 4726 standard, being lower than 0.1 g/(m³·d). This oxygen-blocking level can effectively prevent oxygen from penetrating the heating system, protecting metal components such as boilers, valves, and pumps from corrosion, and extending the lifespan of the entire system.
4. How long is the service life of the five-layer oxygen-blocking tube?
Under normal design, installation, and usage conditions, the service life of the PERT five-layer oxygen-blocking tube can reach over 50 years. This is due to the excellent creep resistance and thermal stability of the PE-RT material, as well as the effective protection of the EVOH layer by the five-layer structure.
5. Can the five-layer oxygen-blocking tube be used in drinking water systems?
OK. The PE-RT material is non-toxic and odorless, and complies with drinking water hygiene standards. In the five-layer structure, the EVOH layer is completely wrapped by hot melt adhesive and PE-RT and does not come into direct contact with water, thus not affecting the water quality. It can be used in domestic cold and hot water supply systems.
