Plastic Materials Chemical Resistance Database

[Nitegazer]

I just discovered that the Whatchamacallit STB Tek recommends using a PET plastic container as a DIY Sep Funnel (read: bad choice). Embarrased that I recommended this inappropriate material to another site member, I sought out a good source of information to ascertain material choices.

Sure, in general, HDPE is a good bet, but there are still several compounds that are incompatible with that material (like butane, or Trimethylbenzene).

Here is a great (and thorough) database where both skilled and noob chemists can confirm the compatibility of their containers, solvents and regents, brought to you by Nalgene: Materials Chemical Resistance Database

If you are not absolutely sure of the appropriateness of your container, don't assume like I did; LOOK IT UP!

 

[۩]

Thanks for this post. Quality of plastics and plasticizers being leeched into extractions is something that is often overlooked, yet precautions need to be properly executed to ensure a pure product is obtained.

Also, even if you have a HDPE container, they are coated with plasticizers which are carcinogenic. And also, what about the cap you are using? They are most of the time not HDPE, and I have seen with my own eyes how badly those things can warp. After an extraction, you can't even close the jug because the plastic has been warped via leech.

 

[Nitegazer]

Aye, that's why I use quality bottles from SKS Bottle and Packaging-- would definitely recommend them.

For STB, I use their Natural HDPE Leak Proof Narrow Mouth Rounds. It has a polypropylene leakproof cap, which is good for Naptha and NaOH-- and they are inexpensive.