Hot and cold water use heat-resistant polyethylene (PE-RT) pipes (Type I/Type II pipes, oxygen barrier pipes)

Category: Heating pipe

Description：The hot and cold water resistant polyethylene (PE-RT) pipe is a type of non-crosslinked polyethylene pipe that can be used for hot water. Some have highlighted its non-crosslinked characteristics, calling it "high-temperature resistant non-crosslinked polyethylene pipe." It is produced using a special molecular design and synthesis process, resulting in a medium/high-density polyethylene. By copolymerizing ethylene and octene, and controlling the number and distribution of side chains, a unique molecular structure is achieved to enhance the heat resistance of the PE pipe. The presence of short branched chains from octene prevents the large molecules of PE from crystallizing into a flat crystalline structure; instead, they interconnect within several bodies, forming links between the crystals. This retains the good flexibility, high thermal conductivity, and inertness of the PE pipe while also improving its pressure resistance.

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Description

　　Product Introduction

Heat-resistant polyethylene (PE-RT) pipes for hot and cold water are non-crosslinked polyethylene pipes that can be used for hot water. Some emphasize its non-crosslinked feature, calling it 'high-temperature resistant non-crosslinked polyethylene pipe.' It is a medium/high-density polyethylene produced using special molecular design and synthesis processes. By copolymerizing ethylene and octene and controlling the number and distribution of side chains, a unique molecular structure is obtained to enhance the heat resistance of PE pipes. The presence of short branched chains of octene prevents the large molecules of PE from crystallizing into a sheet-like crystal but instead interconnects through several bodies, forming connections between crystals. This retains the good flexibility, high thermal conductivity, and inertness of PE pipes while improving their pressure resistance.

PE-RT pipes do not require crosslinking, making it easier to control product quality with fewer production quality defects, thus facilitating the production of qualified pipes. PE-RT pipes can be welded, which perfectly meets the requirement that underfloor heating pipes should not have joints. The flexibility of PE-RT is much better than that of PPR (polypropylene) and comparable to PE-Xa (crosslinked polyethylene). PE-RT pipes have excellent low-temperature performance, allowing construction even in winter low temperatures without preheating when bending pipes, which can solve economic losses caused by low winter temperatures in northern China that prevent construction. Its bending radius can be as small as five times the outer diameter of the pipe, much better than the eight times required for PE-Xa.

The thermal stability test for PE-RT was conducted at 110°C with hoop stress of 1.9MPa for PE-RTI type and 2.4MPa for PE-RTII type over 8760 hours, with no leakage or damage observed. For PE-Xa under 110°C and hoop stress of 2.5MPa, there was also no leakage or rupture after 8760 hours of testing. This indicates that while PE-RT may not be the most outstanding in terms of temperature and pressure resistance, it meets the basic requirements for temperature and pressure resistance in floor radiant heating systems, possessing good quality stability and impact resistance, which means reliability. Its price is comparable to that of PE-Xb, moderate compared to XPAP and PB, and its convenient maintenance features further reduce maintenance costs.

　　Product Features

1. Good stability - long service life. The homogeneity of the pipe material is good, performance is stable, and creep resistance is excellent. When applied in heating and hot water systems, it can ensure a service life of 50 years;

2. Good impact resistance - high safety. The low-temperature brittle fracture temperature can reach -70°C, allowing transportation and construction in low-temperature environments; its ability to withstand external impacts is significantly higher than that of other pipe materials, preventing system damage caused by rough construction;

3. Excellent flexibility - easy to bend and construct. Prevents stress cracking; the pipe is easy to bend without rebounding after bending. This avoids damage at bends due to stress concentration during use. Construction in low-temperature environments does not require preheating of the pipe material, making it convenient;

4. Easy repair with thermal fusion connection - simple installation, convenient maintenance, high cost-performance ratio. If the underfloor radiant heating pipe system is damaged due to external forces, thermal fusion can be used for repairs. It is convenient, quick, safe, and does not require replacing the entire heating pipe. Installation costs and maintenance costs are low, providing high cost-performance.

　　Application Fields

Mainly used in residential heating pipes, hot water supply pipelines, soil heating pipes, warm water heating pipes for agricultural/livestock products, industrial pipes.

Performance indicators for heat-resistant polyethylene (PE-RT) pipes for hot and cold water
Item	Requirements	Test Parameters			Standards
		Parameters	Values
Longitudinal shrinkage rate	≤2%	Temperature	110°C		GB/T 6671
Under static hydraulic conditions Thermal stability test	No rupture or leakage	Static hydraulic stress Test temperature Test duration Sample quantity	PE-RTI type 1.9MPa 110°C 8760h 1	PE-RTII type 2.4MPa 110°C 8760h 1	GB/T 6111
Melt mass flow rate MFR	(Difference from measured value of raw material) (Should not exceed ±0.3g/10min) (And should not exceed 20%)	(Mass of weight) Test temperature	5kg (190°C)		GB/T3682-2000
(Transmittance)^(a)	(≤0.2%)	-	-		(GB/T 21300)
(Oxygen permeability)^(d)	(≤0.32mg/(m·d))²·d)	-	-		(ISO 17455)
(a applies only to pipes for conveying drinking water.) (b applies only to pipes with an oxygen barrier layer.)