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PEEK Chemical Resistance Chart: Solvents, Acids, Bases & More
Organic Solvents
Chemical | Rating | Notes |
Acetone | R |
|
Benzene, Toluene, Xylene | R |
|
Methanol, Ethanol, Isopropanol | R |
|
Gasoline, Diesel, Motor oil | R |
|
Methylene chloride | LR | Minor swelling |
Chloroform | LR | Minor swelling |
THF | LR | Minor swelling |
Ethyl acetate | R |
|
Acids
Chemical | Concentration | Rating |
Hydrochloric acid | 10-37% | R |
Sulfuric acid | 10-50% | R |
Sulfuric acid | 98% (conc.) | NR |
Nitric acid | 10% | R |
Nitric acid | 70% (conc.) | NR |
Phosphoric acid | 85% | R |
Hydrofluoric acid | 40% | R |
Acetic acid (glacial) | 100% | R |
Bases
Chemical | Concentration | Rating |
Sodium hydroxide | 10-50% | R |
Potassium hydroxide | 10-50% | R |
Ammonium hydroxide | 28% | R |
Special Environments
Environment | Rating | Notes |
Steam (200°C, 14 bar) | R | Medical sterilization |
Salt spray | R | Marine |
Skydrol | R | Aerospace |
Body fluids | R | Medical/implant |
Gamma radiation | R | Sterilization |
UV radiation | LR | Use black for outdoor |
NR Chemicals (Avoid)
· Concentrated sulfuric acid (98%)
· Concentrated nitric acid (70%+)
· Bromine
· Fluorine
· Aqua regia
Comparison with Other Plastics
Chemical | PEEK | PPS | PEI | POM | PA66 |
Acetone | R | R | LR | R | LR |
Conc. HCl | R | R | R | LR | LR |
Gasoline | R | R | R | R | LR |
NaOH 50% | R | R | R | NR | LR |
Steam 200°C | R | R | LR | NR | NR |
PEEK offers the broadest chemical resistance, surpassed only by PTFE. See PEEK vs PTFE for tribological comparisons.
FAQ
Q1: What chemicals damage PEEK?
Conc. sulfuric acid (98%), conc. nitric acid (70%+), bromine, fluorine, aqua regia.
Q2: Steam sterilization?
Yes — PEEK withstands steam at 200°C, 14 bar. Ideal for repeated autoclave cycles.
Q3: PEEK vs other plastics?
Broadest resistance among engineering plastics, surpassed only by PTFE.
Ready to source quality engineering plastics? Contact NAGOMER today for a free quote, or browse our PEEK sheets, POM rods, and ESD materials.
NAGOMER — Professional Engineering Plastics Solutions
www.nagomer.com | info@nagomer.com