Cor
25-Jun-2013, 06:41
I have been mixing Pyrocat-HD in glycol for quite some years now, and have come across a problem I haven't had before.
I faithfully follow Sandy King his instructions (http://www.pyrocat-hd.com/html/mixing.html).
The last 2 batches (small volume, only 50 ml, I do not use it that often any more) I had this white precipitate forming when I get to step 5:
"Add the bromide and sodium metabisulfite to about 50-75ml of hot distilled water at about 120F. Stir until completely dissolved, and then add this solution to the propylene glycol solution."
Before adding the bisulfite and bromide my solution is completely clear, but after adding a fine white precipitate is formed, it will not get into the solution, and settles to the bottom after 6 hours or so. I made a second batch, thinking that I had made a mistake, but the same phenomena occurred.
Have you also seen this problem ?
Would it be OK to mix the stock carefully (get the precipitate in solution as even as possible) and use it (I know less than optimal)
Best,
Cor
I faithfully follow Sandy King his instructions (http://www.pyrocat-hd.com/html/mixing.html).
The last 2 batches (small volume, only 50 ml, I do not use it that often any more) I had this white precipitate forming when I get to step 5:
"Add the bromide and sodium metabisulfite to about 50-75ml of hot distilled water at about 120F. Stir until completely dissolved, and then add this solution to the propylene glycol solution."
Before adding the bisulfite and bromide my solution is completely clear, but after adding a fine white precipitate is formed, it will not get into the solution, and settles to the bottom after 6 hours or so. I made a second batch, thinking that I had made a mistake, but the same phenomena occurred.
Have you also seen this problem ?
Would it be OK to mix the stock carefully (get the precipitate in solution as even as possible) and use it (I know less than optimal)
Best,
Cor