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topic 32993

Formulation of pickling paste for stainless steel


Q. To prepare the paste with HF & HNO3 what filler to be added?

Rajendran Sun
metal treatment chemicals - Chennai, Tamilnadu, India


A. Hi Rajendran. The more common thickening agents will not work because the HF will attack Fumed Silica [linked by editor to product info at Amazon] and the HNO3 will attack cellulose thickening agents. Sorry, I don't know the answer. One thing you could do is review expired patents on the subject, or you could buy some and reverse engineer them.

Ted Mooney, Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey
Striving to live "Aloha"


A. The thickener is barium sulfate.

jeffrey holmes
Jeffrey Holmes, CEF
Spartanburg, South Carolina


thumbs up signDear Mr.Sun,

It will be some really mad person who will disclose its proprietary chemistry to you and the world. You may better go to some Chennai five star hotel and ask the recipe of their speciality cuisine and get same feedback from them.

Jenny Smith
- Texas

March 18, 2009

Calcium Gluconate
for HF acid burns

Hi, Jenny. You're right, of course! Still, there is a constant & continuing shift between what constitutes proprietary chemistry versus what is just generic info that is discussed in technical conferences, journal articles, and industry websites. The worldwide patent system, with patents having a limited life of 20 years, is established with the goal in mind of encouraging progress through ideas becoming publicly useable after time.

Some people may consider the thickening agent for gelled acids to be proprietary information but, as you see, some other people consider at least some thickeners to be just generic info.

Users must make sure they have the calcium gluconate first-aid antidote on hand at all times, and a clear plan for proper follow-up medical treatment before even getting near hydrofluoric acid.


Ted Mooney,
Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey
Striving to live "Aloha"

April 14, 2013 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. Hi I am interested to manufacture stainless steel pickling paste/gel. The product is made by using both nitric and hydrofluoric acid with a gelling agent. Kindly assist me. Thanking you and await your reply.

Anil patel
- Nairobi Kenya

May 13, 2013

Q. Kindly let me know how do I manufacture pickling paste for stainless steel without the use of hydrofluoric acid and nitric acid.

Anal Kulkarni
chemicals - Mumbai, Maharashtra, India

May 14, 2013

A. Anal,

Gels production for pickling, passivation for stainless steel, carbon steel, titanium - are proprietary.

adv: If you want to buy the recipes - no problem - contact me. But free advice - sorry, we cannot.

Anna Berkovich
Russamer Labs
supporting advertiser 
Pittsburgh, Pennsylvania
russamer labs banner

October 19, 2014

Q. I am trying to make a pickling paste and have tried barium Sulphate as suggested.
Formula contained HF 5% and Nitric 30%, but Barium sulphate didn't thicken it. Just wondering what I have done wrong? Please help.

Andrew Gilbert
- Queensland Australia

October 19, 2014

A. Not enough barium sulfate. Keep adding until it is the consistency you want.

jeffrey holmes
Jeffrey Holmes, CEF
      South Carolina

November 11, 2018 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. How to convert nitric acid and hydrofluoric acid in gel or paste form

akshata ghadi
- mumbai maharshtra india

November 2018

A. Hi akshata. As you see, we added your posting to a thread where the question was already answered. But please be aware that when you jellify this very dangerous acid, allowing it to be placed onto surfaces and just sit there where people can potentially be unknowingly exposed to it, you significantly increase its dangers. Please make sure you that are a highly responsible steward for the risks you will be creating. Thanks for your understanding.


pic of Ted Mooney
Ted Mooney, P.E. RET
Pine Beach, New Jersey
Striving to live "Aloha"

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