The durability of polyethylene pipes includes:

Atmospheric resistance:

All polymers slowly degrade when continuously exposed to ultraviolet radiation from sunlight. There are two effective methods to protect the resin against these effects, which include:

1- It is adding a layer that blocks the penetration of ultraviolet rays into the material. Another method is to use stabilizers that protect the material using chemical mechanisms. The most effective layer for the raw materials of polyethylene pipes is the result of mixing 2 to 3% carbon black, which leads to the creation of black color.

2- The use of stabilizer in polyethylene pipes allows it to have a color other than black, for example, yellow color is approved for use in natural gas distribution applications, blue color for water related applications, and green color for wastewater. And it is sewage. The suitable pigment is selected in such a way that it does not interfere with the UV stabilizer function.

stabilization:

The raw materials of polyethylene pipes with two main purposes are stabilizing content:

1- In order to prevent the decomposition of the resin during processing and boiling, the material is melted and subjected to very high temperatures.

2- To prevent the reduction of the functional properties of the pipe, which is caused by the slow oxidation of the pipe during its working life.

Due to the creation of chemical reactions at high temperatures, the functional properties of the polymer decrease. This process is the result of the formation of free radicals that continue to react with polyethylene and create a decomposition process that continues even after the material cools down. Thermal stabilizers are added to the material to prevent this process from continuing. By reacting with the primary decomposition products, these stabilizers create stable particles that are no longer chemically active.

At low working temperatures, there is a possibility of a very slow oxidative decomposition process, a process that can lead to a slow deterioration of functional properties. To counter this possibility, antioxidants are added to the raw materials.

Biological resistance:

Biological attack is decomposition by the activities of microorganisms such as bacteria and fungi. In theory, all plastic materials are resistant to such attacks. After installation, polyethylene pipes are not affected by micro-organisms such as those commonly found in water and sewage systems. Polyethylene is not a nutrient material for feeding bacteria, fungi and spores, etc., so it does not cause any damage to polyethylene pipes.