Storing Pyrocat-HD

[brian steinberger]

I'm just now getting near the end of my first batch of Pyrocat HD that I ordered from the Formulary. Needless to say it is still in the original bottles. I've just been sqeezing the air out of the bottles as I go. Anyone have any other suggestions on better ways to store the solutions since you use such little at a time. Also, is there a way to tell if the Pyrocat is bad before using it (ex.. yellowing, dosn't turn amber when mixed).. etc? Thanks!

 

[Ian Grant]

Brian, Pyrocat goes a sort of reddish brown if it goes off. Why don't you get some small bottle and split the stock solution of part A up into smaller batches.

Ian

 

[brian steinberger]

Brian, Pyrocat goes a sort of reddish brown if it goes off. Why don't you get some small bottle and split the stock solution of part A up into smaller batches.

Ian

Ian, You mean reddish-brown once mixed? And solution B is ok to keep in the original bottle?

 

[Ian Grant]

No Brian reddish brown as a stock solution, my stock solution went off here in Turkey while I was in the UK for 6 weeks. That was in full and half full small bottles, but over 18months old, and I returned with ample supplies of fresh solutions.

Part B is a carbonate solution and keeps far better. So less need to take precautions.

Ian

 

[juan]

I keep mine in a one liter glass bottle with no other precautions. I've had it last 8-9 months with no problem. As the glass does not allow oxygen exchange thorough the sides and bottom, I have not worried about the small amount of air actually inside the bottle.
juan

 

[gainer]

You could also make the glycol version of the A solution. I think you can get it ready mixed or as a kit from the Formulary.

 

[Ian Grant]

That's a good suggestion Gadget. I had meant to do that myself but in my rush to pack and leave the UK I just looked up the page on Unblinkingeye and forgot.

Of course it will have a far greater shelf life.

Ian

 

[Tom Hoskinson]

Yes, I mix my Pyrocat Stock A solution in Propylene Glycol instead of water. It lasts for years that way with no change in activity.

 

[brian steinberger]

I purchased my Pyrocat-HD from the Formulary in Glycol. I found that recommendation on this site far before I ventured into Pyrocat. So mine should still be good to go, but I will purchase a few dark brown glass bottles to keep the solutions in as a further precaution. Thanks everyone for the help!