the cheap PE pipes currently on the market, the price is even lower than the price of PE raw materials. The quality of PE pipes made of such raw materials cannot meet the requirements of national standards, causing serious damage to the majority of users and projects. Among the more serious aspects are:

1. Oxidation induction time is not up to standard, the direct impact on the project is to shorten the life of the pipe, in a very short period of time the pipe is aging, can not meet the minimum service life requirements of 50 years.

2. Weathering performance decreased.

3. The long-term hydrostatic strength of the pipe and the ability to resist slow crack growth will decrease, and the distribution of carbon black will be uneven. These points will affect the service life of the product and have potential safety hazards.

consumers confused about how to choose PE pipes? The following is a further discussion on how to judge the quality of the pipes by measuring the most important indicators of PE pipes (oxidation induction experiments and elongation at break time).

1. Oxidation induction experiment (according to the national standard, the oxidation induction time should be greater than or equal to 20 minutes, which is qualified).

Test purpose: Oxidation induction time is an important index to measure the thermal stability of the pipe, its length is closely related to the long-term heat aging life of PE pipe, and the determination of the oxidation induction time of the pipe is to ensure that the pipe can still meet the use requirements in construction, welding and 50 years of use.

unqualified materials is unstable, and they are very easy to age, and various performance indicators are low. Customer complaints of broken pipes and water leakage in pipe network projects using such products will occur frequently, causing varying degrees of losses to the project. At the same time, it also causes great troubles to users.

2. Elongation at break test

Test purpose: Elongation at break is one of the manifestations of good flexibility of the pipe, through the determination of the elongation at break of the pipe, in order to ensure the adaptability of the pipe to the uneven settlement of the foundation, to meet the requirements of seismic performance.

National standard requirements: elongation at break ≥ 350. When the pipe is actually tested for elongation at break, the maximum range of the equipment is not broken, and the displacement of the extensometer is 350mm at this time. That is, when the sample is stretched 350mm, it is not broken, and the elongation at this time is 700, so it can be seen that the elongation at break of the pipe is greater than 700, which is much greater than the national standard requirements.

standard stipulates that PE pipes shall be used as raw materials for Sinopec production, and the raw materials used for water supply pipes shall be mixed ingredients or local color materials + color masterbatch in strict accordance with the national standard GB/T13663-2000. The gas pipe shall be mixed with raw materials in strict accordance with the national standard GB15558.1-2003, and no other surplus materials or fillers shall be added to all products.