Metal finishers helping each other -- No cost, No registration, No damn popups
(we earn from 'affiliate link' purchases, making the site possible)

Home /
T.O.C.
Fun
FAQs
Good
Books
Ref.
Libr.
Adver-
tise
Help
Wanted
Current
Q&A's
Site 🔍
Search
ted_yosem
Curated with aloha by
Ted Mooney, P.E. RET
finishing.com -- The Home Page of the Finishing Industry

  The authoritative public forum
  for Metal Finishing 1989-2025
  mfhotline


  Thread 407/14

Salt tracking problem with PVC plastisol




Dear board,
I am a Vinyl plastisol development Chemist at a USA chemical company. I have been recently assigned the task of removing the salt tracking lines left on plastisol coatings after parts are removed from a molten salt (Sodium Nitrite) tank. I have tried everything from Hydrolysis preventers to Parradfin waxes to different plasticiser and resin combinations no avail. I have a competitors sample and it does not exhibit this phenomenon. The process by which this plastisol is processed is: Parts are cleaned in a Caustic wash to remove any dirt grime or mill scale, then washed clean, then dried, then primed, then preheated to 450F, then dipped into my plastisol for a period of 30 seconds, then removed slowly to reduce drips and allowed to drip free and pre gel, then they are dipped into 395F molten salt for a period of 2 minutes, then removed to drip free, then the parts are ran through a wash stage to remove the crystalized salt from the part, then you have a finished part. Only problem is that my plastisol formulation after being washed leaves "salt track" lines, where salt had sat waiting to be washed off the part. I have talked to some of the greatest minds in this business and they all say no idea. Any thoughts or suggestions would be greatly appreciated.

Chris Pontius
- St Louis, Missouri
2006
publicly reply to Chris Pontius



(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories:

Finishing
Jobshops
Capital
Equipment
Chemicals &
Consumables
Consult'g,
& Software


About/Contact  -  Privacy Policy  -  ©1995-2025 finishing.com, Pine Beach, New Jersey, USA  -  about "affil links"