I would like to ask about the reasons for discoloration in yellow PVC hoses
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I would like to ask about the reason for discoloration in yellow PVC hoses. These hoses were manufactured in November 2015, and discoloration was noticed in August 2016; that is, when the hoses are wiped with a tissue, the tissue turns yellow. I appreciate any advice from you all. Thank you. It won’t be like that when it’s first made; just place it indoors, where there is no direct sunlight.
It should still be due to a quality issue with the pipes; the pipelines are aging. (Aging does not necessarily occur under light exposure; high temperatures or certain external conditions can also accelerate aging.)
It is generally due to natural aging; in the case of gas pipelines, it is important to conduct inspections, and replace them if necessary to avoid danger~~~~
Since it can be wiped on paper, let’s see if we can analyze its components Is it due to the aging, degradation, and decomposition of the pipes? Or other reasons?
It’s probably a problem with the plasticizer you’re using
Plasticizers should be quite stable; it’s better to have a professional conduct an analysis to avoid accidents caused by pipe leaks.
Thank you to the netizens above for their answers; it’s not the trachea, and no cause can be identified at present. I still hope that those with experience can share their insights. With the same plasticizer, there is also no discoloration.
I was conducting heat stabilizer aging tests in the laboratory, and I found that plasticizers leached out from the compressed sheets after a few months. In your case, could it be that the yellow pigment in the PVC pipes leached out along with the plasticizers? Personal guess.