Nitric acid and pvdf

[Husnam]

Does nitric acid diffusion into Polyvinylidene Fluoride affect the mechanical properties of the plastic?
1) Is Polyvinylidene Fluoride chemically compatible with Nitric acid 45 % at 70 C?
2) And, will it diffuse and affect its mechanical properties?

 

[btrueblood]

1. yes - see link below
2. have no data, have not heard of this issue.

http://www.ipexna.com/media/1698/pvdf-chemical-resistance-guide.pdf

 

[Demon3]

The book Chemical Resistance, Volume 1 - Thermoplastics, Second Edition says that PVDF exposed to 45% nitric acid at elevated temperature has a resistance of 8. That means 90-94% retention of mechanical properties and no substantial change in dimensions or appearance. They define elevated temperature as tests done at 45°C and above.

Chris DeArmitt PhD FRSC
President

Plastic materials consultant to the Fortune 100
Creating New Materials - Problem Solving - Innovation Keynotes - Expert Witness

http://www.phantomplastics.com