Formic acid strength % ?

I am running out of Formic Acid, which was given to me by a freind.
I want to get new supply and I am not sure what % formic I should buy.
A freind knows a supplier and has strengths from 98% and down.

What percent formic should i get?

Thanks, Jim

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75% or higher

Ihave seen some very weak solutions out there. So get the highesr you can find.

I used 85%!

I used to use 85% and had very good results. I mixed it 0.9 fl .ozs. of 85% Formic Acid, and 1 Lb. of Salt to each 1 gallon of Water used. The PH was about 2.2-2.5!

Bruce Rittel

Thanks

Thanks for your help guys.