PEEK material datasheet

Polyether ether ketone (PEEK) is a colourless organic thermoplastic polymer in the polyaryletherketone (PAEK) family, used in engineering applications.


Chemical and physical properties

PEEK is a semicrystalline thermoplastic with excellent mechanical and chemical resistance properties that are retained to high temperatures. The processing conditions used to mold PEEK can influence the crystallinity, and hence the mechanical properties. The Young's modulus is 3.6 GPa and its tensile strength 90 to 100 MPa. PEEK has a glass transition temperature of around 143 °C (289 °F) and melts around 343 °C (662 °F). Some grades have a useful operating temperature of up to 250 °C (482 °F) . The thermal conductivity increases nearly linearly versus temperature between room temperature and solidus temperature.[5] It is highly resistant to thermal degradation as well as attack by both organic and aqueous environments. It is attacked by halogens and strong Bronsted and Lewis acids as well as some halogenated compounds and aliphatic hydrocarbons at high temperatures. It is soluble in concentrated sulfuric acid at room temperature, although dissolution can take a very long time unless the polymer is in a high surface area to volume form such as a fine powder or thin film. It has high resistance to biodegradation.

* Citing source: Wikipedia



Chemical resistance chart

How to use this chart

» Meaning of symbol:

       OK: Recommend

△: Must confirm if usable by testing advanced. 

 X: Not recommend

» This chart only provide result of single chemical to material, if client use more than one kinds of chemical in the same time, please choose material by experience.

» This chart is for reference which not able to be applicable to all environment. Please design equipment according to practical experience.


Catagory Chemical PEEK
Organic acids Acetic acid

OK (10% @ 23°C,100°COK (Conc. @ 23°C,100°C)

Acetic acid, glacial OK (23°C,100°C)
Citric acid OK (23°C,100°C)
Organic compound  Acetaldehyde
OK (23°C,100°C) 
OK (23°C,100°C)
 Aniline OK (23°C) △ (100°C)
 Benzaldehyde OK (23°C)
Benzene OK (23°C,100°C)
Benzyl alcohol
OK (23°C) 
 Ethanol OK (23°C,100°C)
Ethylene glycol
OK (23°C,100°C)
 Fatty acid OK (23°C,100°C) 
 Formaldehyde OK (23°C,100°C)
Formic acid
Hexane OK (23°C) 
Lactic acid  OK (23°C,100°C)
OK (23°C,100°C)
 Phenol X (Conc.)
Propane,liq OK (23°C) 
 Propanol OK (23°C) 
Tannic acid  X (10% Conc. @ 23°C, 100°C)
 Tartaric acid OK (23°C,100°C)
Toluene OK (23°C)
Urea OK (23°C,100°C)
Inorganic compound Ammonia
OK (23°C)
Ammonium hydroxide OK (10% Conc. @ 23°C) OK (Conc. @ 23°C)
Aqua regia
X (23°C, 100°C, 200°C)
Barium chloride OK (23°C) 
OK (23°C,100°C)
Calcium Chloride
OK (23°C,100°C) 
Carbonic acid
OK (23°C,100°C)
X (23°C, 100°C, 200°C) 
 Detergent OK (non-phenolic @ 23°C,100°C) 
 Hydrobromic acid


X (100% @ 23°C, 100°C, 200°C)

Hydrochloric acid

OK (10% Conc. @ 23°C,100°C) OK (Conc. @ 23°C)

 (Conc. @ 100°C)

Hydrofluoric acid
X (40% Conc. @ 23°C, 100°C, 200°C)
Hydrogen peroxide
OK (23°C,100°C)
Nitric acid

OK (10% Conc. @ 23°C,100°C) △(30% Conc. @ 23°C)
X (50% Conc. @ 23°C,100°C, 200°C) X (Conc. @ 23°C,100°C, 200°C)

Phosphoric acid

OK (10% Conc. @ 23°C,100°C, 200°C)

OK (50% Conc. @ 23°C,100°C, 200°C)

 OK (80% Conc. @ 23°C,100°C)

Potassium hydroxide
OK (10% Conc. @ 23°C) OK (70% Conc. @ 23°C)
Potassium nitrate
OK (23°C,100°C)
Potassium sulfate
OK (23°C,100°C)
Sodium carbonate
OK (23°C,100°C)
Sodium hydroxide

OK (10% Conc. @ 23°C,100°C, 200°C)

OK (50% Conc. @ 23°C,100°C, 200°C) OK (Conc. @ 23°C)

 Sodium nitrate  OK (23°C,100°C)
 Sulfuric acid

 △ (<40% Conc. @ 23°C,100°C, 200°C)

X (>40% Conc. @ 23°C,100°C, 200°C)

Sulfur dioxide

OK (23°C @ 100°C, 200°C)


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