The core difference between 3PP and 3PE anti-corrosion steel pipes lies in the outer layer material, which directly determines their temperature resistance and cost. 3PE is the mainstream choice for economical and general use, while 3PP is a "professional upgrade" designed for high temperature or harsh environments.

Both use the same three-layer structure, differing only in the outermost plastic layer.

Bottom layer: Fusion-bonded epoxy powder (FBE), providing core corrosion protection.

Intermediate layer: Adhesive, which connects the bottom layer and the outer layer.

Outer layer: 3PE uses polyethylene (PE), 3PP uses polypropylene (PP)

Key differences in performance and cost:

1. Upper temperature limit (most critical difference): 3PE's continuous operating temperature is typically 80°C, while 3PP can reach 110°C or even higher. If a pipeline operates at temperatures above 80°C for an extended period but 3PE is mistakenly used, the coating may fail prematurely.

2. Mechanical properties: 3PP has higher surface hardness and better wear resistance, making it more advantageous in rocky terrain or high-wear conditions.

3. Chemical resistance and weather resistance: Both have good resistance to acids, alkalis and salts, but 3PP has better solvent resistance and inherent UV resistance, making it more suitable for outdoor exposure environments.

4. Cost: 3PP has higher material and processing costs, and its price is usually about 15-25% higher than 3PE.

The core of the selection is the operating temperature and service environment.

Scenarios where 3PE is preferred: operating temperature below 80°C, conventional underground burial, and cost-sensitive projects. It is the mainstream solution for buried pipelines worldwide, offering the best cost-performance ratio.

3PP should be selected for the following scenarios: operating temperature between 80°C and 110°C, outdoor or strong ultraviolet environment, and high wear conditions. Examples include high-temperature oil pipelines, desert pipelines, marine risers, or geothermal pipelines.

Time：23/10/2026 16:38:04

I can only answer your question based on my experience. Both 3PP and 3PE belong to multi-layer coating systems, consisting of a bottom layer of epoxy powder, an intermediate layer of adhesive, and an outer layer of PP (polypropylene) and PE (polyethylene). The processing methods are similar, and they can be produced using the same production line. However, the inherent differences in properties between PP and PE materials result in different performance characteristics for 3PP and 3PE coatings, making them suitable for different environments. The advantages of 3PP coating in certain performance aspects enable it to function in areas where 3PE coating is not applicable. Therefore, many pipeline projects abroad have adopted 3PP anti-corrosion coatings. Currently, the main products available are from overseas, targeting countries with higher ambient temperatures. PP is also harder than PE, which helps prevent scratches on the coating.

Time：21/10/2026 12:38:18

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