RHT Pex Pipe Specifications and Certifications:

Comparison between RHT multilayer pipes and other pipes
　　　　　　 Pipes
projects 		RHT pex AL
multilayer pipes 		RHT pex B pipes PPR pipes
UPVC pipes
Thermal coefficient
(w/m.K)		 0.45
 0.41 0.24  
Thermal expansion ratio 2.5×10-5(almost equal to
the value of aluminum)		 2.0×10-4 1.8×10-4 3.9×10-5
Packing coil
 coil straight straight
Cutting easiest
 easiest easy easy
Jointing type screw or press fitting screw or press fitting

heat-fusion
 adhesive with solvent
Installing easy easy

difficult(need special heat-fusion tools)

 difficult(need special solvent)
Operation condition Tmax=95° C
pressure:1Mpa		 Tmax=90° C
pressure:0.6Mpa		 Tmax=70° C pressure:1Mpa Only for cold water
Bending at room
temperature		 easy but no spring back
for small size pipe		 easy but spring back no bending no bending
Low temperature
resistance		 excellent excellent bad bad
Stress crack resistance excellent excellent bad bad
Size stability high lower lower lower
Gas permeability 0 little(need barrier layer) little little
Chemical resistance excellent excellent good general
Heat-aging resistance good good bad bad
Hygiene excellent excellent excellent general
(need to add kinds of additives)
Price(for small-diameter
pipes)		 high lowest lower lower
Application scope Potable water supply system , compressed air pipeline, floor-heating system etc. Cold-hot piping system and floor-heating system etc. Cold-hot piping system with lower temperature. Only used for drainage system in general.

 

Thermal & pressure resistance______________
Note:1Mpa=145psi=10bar
Specification
 Minimum
burst
pressure
(MPa)		 Min pipe
ring
strength
(N)		 long-term
hydrostatic
strength
(MPa)		 working temperature(° C) working pressure
(mm) (inch) Pex AL
 Pex AL
1014 3/8 7.0 2300 2.7 -40~60 1.0
1216 1/2 6.0 2300 2.7
1418 9/16 6.0 2300 2.7
1620 5/8 5.0 2500 2.7
2025 3/4 4.0 2500 2.3
2632 1 4.0 2500 2.1
3240 11/4 4.0 3500 2.1
4150 11/2 3.5 3700 2.0
5163 2 3.5 5500 2.0
6075 21/2 3.5 6000 2.0
 
Thermal conductivity______________
0.45W/m.k, about 1/100 that of steel pipe but only several times higher than that of insulating materials.
 
Corrosion resistance______________
The inside and outside polyethylene are a kind of symmetrical and non-polar material with stable
characteristics. At normal temperature, it does not dissolve in any known solutions and is resistant against various kinds of acid, alkali and salt.
 
Hygiene______________
RHT pipe is hygienic, toxic free, rust free preventing the growth of microorganisms, thus avoiding contamination to water . It has acquired' Approval of Hygienic Product for Potable Water'(YUE WEI SHUI ZI [1997]S0008), and has passed all the tests of pipe for potable water in accordance with the   British Standard BS6920 by the British WQC and tests by HongKong Polytechnic University.
 
Long-term hydrostatic strenthCertifications______________
RHT pipe has met the following certifications- NSF USA - IAMPO USA - CSA B137.5 CANADA PEX PIPE SYSTEM - SGS GAS PIPES - ISO 9001 GERMANY - DVGW GERMANY - SKZ GERMANY PEX - SKZ GERMANY (PE-RT/AL/PE-RT) - WRAS UK - AENOR SPAIN (PE-RT/AL/PE-RT) - AENOR SPAIN PEX - STF FINLAND (PE-RT/AL/PE-RT SYSTEM) - SKZ GERMANY (PEX/AL/PEX) - ITC CZECH - SNAS SLOVAK - TIN POLAND - PZH POLAND - EMI HUNGARY.





Weathering quality and working life_________
It can be concluded from this graph that if utilized under the stipulated conditions and pressures , RHT Pipe can have a working life of more than 50 years. The compelling weathering test by the Compound Material Research Institute of National Chemical Ministry also proves that RHT Pipe can have a working life of 50 years.
Burning resistance______________
The PE(X)-AL-PE(X) composite structure acquires RHT Pipe a much better burning resistance than that of all polyethylene pipe.With the test by the National Fire-proof Construction Material Quality Supervisory Test Center,the burning resistance of RHT Pipe is proved to reach Grade B1 of GB8624,stipulations for wire and cable conduit plastic material.
 
Hydraulic Function ______________
The roughness coefficient of RHT Pipe is 0.007mm.The inside wall is very smooth,scale free and low flow resistant
which makes RHT Pipe ideal for fluid carrying (such as water). Due to it's hard but flexible composite structure,
the lashing pressure is quickly eliminated, thus no disturbing sound occurs.
 

Oxygen-permeability of various kinds of plastic pipes______________

Oxygen-permeability of various kinds of plastic pipes
Installation ______________
Bendable but never springs back, decreases number of fittings
attached,easy installation (saves time).
 
Other advantages ______________
The core layer of Aluminum guarantees static resistance, lightness and oxygen tightness, it also ensures no growth of microorganism inside water pipe and the safety in gas supply.
Coefficient of heat expansion




Coefficient of heat expansion______________
25×10-6m/m.k, only 1/8 that of all polyethylene pipe, almost the same as that of aluminum pipe. (see right table)