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Myth 1. PE-Xa pipes have better strength characteristics compared to PE-Xb and PE-Xc pipes.
Reality. Permissible working pressure of pipes (their "strength") it is absolutely the same in the entire operating temperature range for all types of PE-X pipes – it is regulated by GOST 32415-2013 and does not depend on the stitching method.
Myth 2. PE-Xa pipes are better because of the higher percentage of crosslinking – 70% (PE-Xb – 65%, and PE-Xc – 60%).
Reality. The degree of crosslinking is a normative parameter in production technology. In order for the pipe to have the required technical characteristics, it must be "stitched" to the minimum required level (PE-Xa by 70%, PE-Xb by 65%, PE-Xc by 60%).
Important! Pipes with zero or minimum (up to 20%) crosslinking percentage are often found on the market, which reduces the service life of such products tenfold compared to the standard crosslinking.
Myth 3. Environmentally friendly and safe material is used in the production of PE-X pipes (unlike PE-Xb and PE-Xc).
Reality. All pipes that will come into contact with drinking water during operation, and which are intended for use in domestic drinking water supply, are subject to pre-market control in the form of state registration. Accordingly, if a Certificate of state registration is issued for the pipe, then it is safe regardless of the stitching method.
Myth 4. PE-Xb pipes are made from recycled materials and the cheapest materials.
Reality. All types of pipes (PE-Xa, PE-Xb and PE-Xc) are made only from the primary base component (HDPE compound) based on the same grades of linear PE. Cross-linked polyethylene is not recyclable due to the acquired characteristics.
Myth 5. PE-Xa pipe is the most flexible due to the increased elasticity of the material.
Reality. The flexibility of the pipes does partly depend on the stitching method, but the main factor is the brand of the base component used in the production (HDPE compound).
Myth 6. PE-Xa pipes belong to the fifth class of operation, respectively, they are designed for a coolant with a temperature of up to +95 °C and an operating pressure of up to 16 bar.
Reality. There is GOST 32415-2013, according to which the maximum working pressure of pipes of the 5th class should not exceed 10 bar (1 Mpa), regardless of the stitching method. The temperature of the transported medium can reach +100°C for the 5th class (as well as for the 4th class), but only for a period of no more than 100 hours during the entire operation. All parameters of the operating classes are the same for PE pipes and do not depend on the stitching method.
Conclusion. To choose a high-quality PE-X pipe, it is necessary to pay attention primarily not to the stitching method, since the technical characteristics do not depend on it, but to the manufacturer.
Indirect signs of high quality of pipe products include: