What impact do different inner wall colors have on HDPE double-wall corrugated pipes?

The most common HDPE double-walled corrugated pipes on the market have mostly black inner walls. However, in practical applications, HDPE double-walled corrugated pipes with inner walls of different colors such as blue, yellow, green, and red will also be encountered. Please refer to the picture below:

The inner wall colors of HDPE double-wall corrugated pipes are so many that only you can imagine, and no factory can do it.

Regarding the relationship between inner wall color and quality, a widely circulated statement on the Internet is: HDPE double-wall corrugated pipes with black outside and black inside are national standards, while HDPE double-wall corrugated pipes with black outside and blue inside are non-standard. In fact, this statement Not accurate.

According to the national standard implementation standard for HDPE double-wall corrugated pipes GBT19472.1-2019, the regulations on pipe color are: the colors of the inner and outer layers of the pipe should be uniform, and the outer layer is generally black. Other colors can be agreed upon by both the supplier and the buyer. Therefore, the color of the inner wall of the pipe is not used to distinguish national standards and non-standard products, nor is it used to distinguish different uses.

The reason why the inner walls of various colors appear is the same as the color of HDPE solid wall pipes. It is due to the addition of different colors of masterbatch during the production process. Masterbatch is a high-concentration pigment or colorant, usually in the form of granules or powders. Coloring purposes can be achieved by mixing it with polyethylene resin.

In the final analysis, no matter what color the inner wall of the HDPE double-wall corrugated pipe is, the factors to measure its performance are core indicators such as ring stiffness, ring flexibility, and impact performance. As for the color of the inner wall, it has no direct relationship with the quality of the pipe and can be determined by supply and demand. Both parties shall agree upon the need.

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