So as a software developer for Real-Time Analyzers (www.rta.biz
) I was able to do some chemical analysis on samples of this delrin plastic mixer (from McMaster).
I decided to do a study on delrin in HCl (hydrochloric acid, a strong acid that should leech out chemicals), Starsan, Isopropyl, and Ethanol.
The HCl destroyed the sample in the matter of hours, and obviously I was able to see the Delrin in the sample as it was dissolved into it.
More interestingly, after subtracting the StarSan spectrum with the Starsan and Delrin, I was left with a spectrum that directly lines up with Delrin, so I did notice some Delrin in the StarSan sample. The StarSan sample was not diluted, and was used how you buy it. One can do tests with different dilutions to see the effect, but by principle if it is noticeable in pure StarSan, it should still be noticeable under weaker conditions, but I might not be able to test it at that concetration (because of all the water).
I just finished looking at the measurements, and am putting together some results, the above test was done quickly, so I want to re-do it more carefully.