Many of our customers ask for information on acid resistant plastics.
So here are the top five for all around acid resistance.  Be sure to check out the chemical resistance chart at the bottom of this article.

1)       Teflon® (PTFE)

PTFE is a synthetic fluoropolymer of tetrafluoroethylene. It is hydrophobic and is used as a non-stick coating for pans and other cookware. It is very non-reactive and is often used in containers and pipework for reactive and corrosive chemicals. PTFE has excellent dielectric properties and a high melting temperature. It has low friction and can be used for applications where sliding action of parts is needed, such as plain bearings and gears. PTFE has a wide variety of other applications including coating bullets and use in medical and laboratory equipment. Given its many uses, which include everything from an additive to coatings, to its uses for gears, fasteners and more, it is, along with nylon, one of the most widely used polymers.

2)       PCTFE

PCTFE, formerly called by its original trade name, KEL-F, has higher tensile strength and lower deformation under load than other fluoropolymers.  It has a lower glass transition temperature than other fluoropolymers.  Like most or all other fluoropolymers it is inflammable. PCTFE really shines in cryogenic temperatures, as it retains its flexibility down to -200°F or more. It does not absorb visible light but is susceptible to degradation caused by exposure to radiation. PCTFE is resistant to oxidation and has a relatively low melting point. Like other fluoropolymers, it is frequently used in applications that require zero water absorption and good chemical resistance.

3)       Kynar® PVDF

PVDF resins are used in the power, renewable energies, and chemical processing industries for their excellent resistance to temperature, harsh chemicals and nuclear radiation. PVDF is also used in the pharmaceutical, food & beverage and semiconductor industries for its high purity and availability in a multitude of forms. It can also be used in the mining, plating and metal preparation industries for its resistance to hot acids of a wide range of concentrations. PVDF is also used in the automotive and architectural markets for its chemical resistance, excellent weather-ability and resistance to UV degradation.

4)       Halar® (ECTFE)

A copolymer of ethylene and chlorotrifluoroethylene, Halar® is a semi-crystalline melt processable partially fluorinated polymer. Halar (ECTFE) is particularly suitable for use as a coating material in protection and anti-corrosion applications thanks to its unique combination of properties. It offers high impact strength, chemical and corrosion resistance over a wide temperature range, high resistivity and a low dielectric constant. It also has excellent cryogenic properties.

5)       CPVC

CPVC resin is made by the chlorination of PVC resin and is used primarily to produce piping. CPVC shares many properties with PVC, including low conductivity and excellent corrosion resistance at room temperatures. The extra chlorine in its structure also makes it more corrosion resistant than PVC. Whereas PVC begins to soften at temperatures over 140°F, CPVC is useful to temperatures of 180°F. Like PVC, CPVC is fire-retardant. CPVC is readily workable and can be used in hot water pipes, chlorine pipes, sulfuric acid pipes, and high-pressure electric cable sheaths.

Acid Resistance Chart

Acetic Acid, aqueous solution 5% Acetic acid, aqueous solution 10% Acetic acid, concentrated Boric acid, aqueous solution 10% Citric acid, aqueous solution 10% Formic acid, aqueous solution 10% Hydrochloric acid, aqueous solution 2% Hydrochloric acid, aqueous solution 36%
Teflon (PTFE) R R R R R R R R
PCTFE (Kel-F) R R R R R R R R
Kynar (PVDF) R R R R R R R R
Halar (ECTFE) R R R R R R R
CPVC R R R R R R R R
Hydrofluoric acid, 40% Lactic acid,aqueous solution 10% Lactic acid, aqueous solution 90% Nitric acid, aqueous solution 2% Oxalic acid, aqueous solution 10% Phosphoric acid, aqueous solution 10% Phosphoric acid, concentrated Salicyclic Acid
Teflon (PTFE) R R R R R R R R
PCTFE (Kel-F) R R R R R R R
Kynar (PVDF) R R R R R R R R
Halar (ECTFE) R R R R R R R R
CPVC R R R R R R R R
Sulphuric acid, aqueous solution 2% Sulphuric acid, concentrated 98% Tartaric Acid
Teflon (PTFE) R R R
PCTFE

(Kel-F)

R R R
Kynar (PVDF) R LR R
Halar (ECTFE) R R R
CPVC R LR R

Table Key: R (Resistant), LR (Limited Resistance), NR (Not Resistant).  Data is at 68 F.

Did I miss an acid you have a question about?  Let me know in the comments section below.

Looking for more chemical resistance data?  Download our free guide.

 

13 responses to “Top 5 Acid Resistant Plastics

  1. I am using muriatic acid to clean earth crust off of rocks and gems such as garnet.

    I was told by other gemstone miners they use muriatic acid in pure form.

    My question is what type of container can I use? The chart above doesn’t do me any good.

    Can I use a glass jar or a baking pan?

    Thank you

  2. I am building a battery box to hold punctured vehicle batteries and would like to know what common material would work best to contain the acid within the box for moving?

    1. Paul – I just checked a couple of websites, and both suggest using a double plastic garbage bag for containment – clear might be a good idea, so you can see the contents. These are made from polyethylene. Good luck!

  3. Hie, I want a plastic tank that can hold caramel ( the food colorant derived from sugar). It is acidic. what kind of plastic would you recommend.

    Thanks

    1. Floriano,

      I would look into teflon. It is resistant to most chemicals – and will likely clean up better than most! (see teflon cooking surfaces)

  4. I’m using formicacid for Polyethylene terephthalate(PET)degradation which shows slight attack by absorption,can I proceed further with formic acid for PET degradation?
    Thank you.

    1. Rea – At concentrations of 5% – 30%, PET has good resistance to formic acid. At 90%, its poor.

  5. I want to make a fume hood, What material sheet would be suitable for the airfoil.
    Thanks in advance.

  6. I need to make a flap for a vent opening which is exposed to mostly H2S ( wet) and sulphuric acid (hi) and is exposed to UV etc. I am looking for sheet of approx 300mm x 300mm x 1-2mm thick and it needs to be rigid for sealing purposes.
    Thanks in advance
    Rob

    1. Rob -= Thanks for reading Craftech Industries’ posts. We don’t supply sheet material. I suggest you contact AIN Plastics for help with your project.

Leave a Reply

Your email address will not be published. Required fields are marked *