Standard dimension ratio (SDR) is a method of rating a pipe's durability against pressure. The standard dimension ratio describes the correlation between the pipe dimension and the thickness of the pipe wall.

PPR means polypropylene random copolymer, a thermoplastic consisting of chains of carbon and hydrogen. The“R” refers to the random blend of long and short hydrocarbon chains that provide both rigidity and flexibility, resulting in a material with strong structural properties that can absorb impact and deflection. Polypropylene random copolymer (PPR) pipes and fittings are used for plumbing inmechanical and industrial applications around the world. Pipes made from PPR are lightweight, non-corrosive, non-rusting and non-scaling. They are permanently leak-free by hot-fusion connections and leak-free joints.

The aluminum layer has an excellent oxygen barrier (Oxygen Permeability <0.01mg/m2.day) and opacity.

The thermal expansion for RIFENG PPR Pipe is approximately 0.025(mm/mK).

Yes. However, pressure testing with high pressure air can be dangerous if not operate properly. And any tests with air must only be done by a competent-trained engineer who has to be confirmed with the RIFENG technical team before testing.

Yes. RIFENG Multilayer Pipe is suitable for such an application.

RIFENG Multilayer Pipe can be used in a variety of connections and is very easy to install, but we still recommend asking operators with professional skills to install.

RIFENG Multilayer Pipe, also called PAP, the high-quality RIFENG Multilayer Pipe for drinking water and heating installations consist of inside and outside layers of cross-linked polyethylene and a core of aluminium. All layers are permanently bounded together by means of intermediate adhesive layers to form a single product. A special welding technique guarantees a maximum of safety.

RIFENG Multilayer Pipe unites the advantages of plastic and metal pipes. The inner and outer layers of cross-linked polyethylene provide flexibility and lightness. The smoothness of the inner cross-linked polyethylene layer reduces flow noise transmission and prevents corrosion. The longitudinally overlapped welded aluminium layer ensures the dimensional stability of the pipe and prevents oxygen penetration. The aluminium layer is also crucial for the strength and the thermal expansion of the pipe. With the permanent bond between the cross-linked polyethylene layers and the aluminium layer, the linear expansion of the pipe is determined by the expansion factor of the aluminium which roughly corresponds to that of a metal pipe. RIFENG Multilayer Pipe offers a high degree of flexibility and durability, combining with high pressure and temperature resistance.

RIFENG PEX pipes are allowed to be buried directly in soil or concrete. For safer and faster installation, we recommend using pre-sleeved PEX pipes.

They all meet the same performance standard, but their manufacturing processes are completely different.

PEX A. Peroxide method-It involves introducing peroxide (a form of oxygen) into HDPE before forming HDPE to achieve the highest degree of cross-linking.

PEX B. Silane method-It is the most common manufacturing method.

PEX C. Irradiation method- It is not as widely applied as the first two methods.

Yes, the PEX tube is freeze-damage resistant. The PEX pipe can expand to a certain extent when it is frozen, and shrink to its original shape when it is thawed. However, PEX pipes are not freeze-proof, and you should use standard insulation precautions to prevent freezing.

Their performance is exactly the same, and the color can be used to distinguish hot and cold water lines.