Etching Acetal (Delrin) plastic in preparation for painting, gluing, etc

2010-04-15

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I mixed:

40g water

25g potassium dichromate

500g concentrated sulfuric acid

http://books.google.com/books?id=Fl57Byhp0ecC&lpg=PA114&ots=wYk-A7i9px&dq=delrin%20etch%20chemical&pg=PA114#v=onepage&q=delrin%20etch%20chemical&f=false

I guess this mixture is commonly called chromic acid.

Things that I should have done:

Use a Pyrex beaker

Don't use the magnetic stirrer, just use a teflon stir stick

Use an ice bath at the beginning of the procedure