Viton Valves / Santoprene Diaphragm and NAOH

814jeffw

Active member
Just wondering how many ounces of NAOH per gallon of water is safe to run with Viton/Santoprene? I hear and read that Viton isn't good for NAOH at 20%.

Anyone have experiences with this and could you please tell me what a "safe" NAOH/water mix is for these materials.


Thank You,
Jeff
 

Christopher

Moderator
I know several guys that use that setup for spraying very strong caustic based degreasers and have got 1 to 3 years out of each pump. I got a couple out of mine when I used that setup on the trailer. Not sure what the ounces per gallon would be though.

I have run Hotsy Ripper 2 50/50 through one of those pumps years ago and no issues at all. Even used it to transfer the Ripper 2 straight out of the drum into the sprayer tank on the trailer, again not sure how hot it is. I think that the MSDS will be online. I might have an old MSDS in the files, can look for it tomorrow if that will help.

When done spraying I would flush it with water, about 5 gallons each time, I think that helped a lot.
 

814jeffw

Active member
Thanks Christopher,..this is my 1st. go round with 12V. so I don't have any real World experience with them. I bought a 2 GPM 60 PSI Delavan to use as a chemical applicator for certain jobs. Don't trouble yourself with the MSDS,.What you said about others have done,.. and yourself is enough to make me feel more comfortable with doing it once in a while,...won't be done that often. Yes,..I believe you on the rinsing thing.

*Out of curiosity and to possibly learn something new,... Trying to figure out how many oz. NAOH per gallon of water equals a 20% solution. Digging around online at calculations made me remember why I failed math numerous times,Ha,Ha,..

Through searching the board I found this: "One pound of Caustic/ Sodium Hydroxide Beads or flakes (99% strength) in one gallon of water will make the solution about 11% Sodium Hydroxide."

If this is the case, I should be good,..I never use NAOH at this strength. I use about 8 oz. per gallon at most.

Viton is rated fair for NAOH at 20% and Santoprene is rated excellent.


Thank You,
Jeff
 
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