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- Apr 23, 2018
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Ospho and Kleen Strip prep and etch are two products that have both changed formulation in the last few years. Ospho did most certainly have chromic acid in it at one point, I have some in stock still. I've also seen the newer SDS that says phos only. And Kleen Strip once was a 50/50 mix of hydrochloric and phosphoric acids, but now is only phosphoric. As a pickle and etchant, it's all fine and good. As a rust converter, straight phosphoric is better. As a post-parkerizing (manganese conversion) rinse, you really want the chromic acid. I like the new Kleen Strip because the old hydrochloric was in there more for the concrete prep use. I am sad about the new Ospho, the chromic set it apart in my opinion. Now, the two products are the same as far as I can tell.
The biggest impact on how fast these work is temperature. Concentration isn't very critical, so pour some hot tap water in a bucket and stir in your acid to about 20% v/v if you want it to work fast. It will.
The biggest impact on how fast these work is temperature. Concentration isn't very critical, so pour some hot tap water in a bucket and stir in your acid to about 20% v/v if you want it to work fast. It will.