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Acetal (POM) Chemical Resistance Chart

Acetal (POM/Delrin) is an engineering thermoplastic with excellent dimensional stability, low friction, and good chemical resistance to solvents and fuels.

803 chemicals tested 20°C & 50°C data
389
Excellent (A)
302
Good (B)
119
Limited (C)
146
Not Recommended (D)

Resistance by chemical class

Most rows rated A or B
Aromatic hydrocarbons 100 %; Foods and beverages 100 %; Vegetable and animal oils, fats, essential oils 100 %
Fewest rows rated A or B
Phenols 0 %; Mineral acids 5 %; Organic acids 34 %
All rated rows, by rating
A 41 %, B 32 %, C 12 %, D 15 % (956)

Chemical classes were assigned by this site, not by the source. Mixtures and trade products without a clear class are not counted.

Acetal (POM): Resistance by chemical classMineral acids: A 2 %, B 3 %, C 3 %, D 92 %. Organic acids: A 16 %, B 19 %, C 33 %, D 33 %. Alkalis: A 67 %, B 10 %, C 24 %. Salts and salt solutions: A 47 %, B 29 %, C 18 %, D 6 %. Oxidising agents and halogens: A 19 %, B 24 %, C 13 %, D 44 %. Alcohols and glycols: A 75 %, B 21 %, C 4 %. Phenols: C 64 %, D 36 %. Ketones and aldehydes: A 40 %, B 51 %, C 9 %. Esters and ethers: A 25 %, B 63 %, C 12 %. Amines and nitrogen compounds: A 26 %, B 47 %, C 26 %. Aromatic hydrocarbons: A 64 %, B 36 %. Fuels, mineral oils and aliphatic hydrocarbons: A 68 %, B 27 %, C 3 %, D 1 %. Vegetable and animal oils, fats, essential oils: A 29 %, B 71 %. Halogenated hydrocarbons: A 49 %, B 31 %, C 11 %, D 9 %. Foods and beverages: A 61 %, B 39 %.Mineral acids (63)Mineral acids: A 2 % (1)Mineral acids: B 3 % (2)Mineral acids: C 3 % (2)Mineral acids: D 92 % (58)D 92 %Organic acids (64)Organic acids: A 16 % (10)A 16 %Organic acids: B 19 % (12)B 19 %Organic acids: C 33 % (21)C 33 %Organic acids: D 33 % (21)D 33 %Alkalis (21)Alkalis: A 67 % (14)A 67 %Alkalis: B 10 % (2)BAlkalis: C 24 % (5)C 24 %Salts and salt solutions (197)Salts and salt solutions: A 47 % (92)A 47 %Salts and salt solutions: B 29 % (58)B 29 %Salts and salt solutions: C 18 % (36)C 18 %Salts and salt solutions: D 6 % (11)DOxidising agents and halogens (63)Oxidising agents and halogens: A 19 % (12)A 19 %Oxidising agents and halogens: B 24 % (15)B 24 %Oxidising agents and halogens: C 13 % (8)C 13 %Oxidising agents and halogens: D 44 % (28)D 44 %Alcohols and glycols (57)Alcohols and glycols: A 75 % (43)A 75 %Alcohols and glycols: B 21 % (12)B 21 %Alcohols and glycols: C 4 % (2)Phenols (14)Phenols: C 64 % (9)C 64 %Phenols: D 36 % (5)D 36 %Ketones and aldehydes (35)Ketones and aldehydes: A 40 % (14)A 40 %Ketones and aldehydes: B 51 % (18)B 51 %Ketones and aldehydes: C 9 % (3)CEsters and ethers (68)Esters and ethers: A 25 % (17)A 25 %Esters and ethers: B 63 % (43)B 63 %Esters and ethers: C 12 % (8)CAmines and nitrogen compounds (38)Amines and nitrogen compounds: A 26 % (10)A 26 %Amines and nitrogen compounds: B 47 % (18)B 47 %Amines and nitrogen compounds: C 26 % (10)C 26 %Aromatic hydrocarbons (14)Aromatic hydrocarbons: A 64 % (9)A 64 %Aromatic hydrocarbons: B 36 % (5)B 36 %Fuels, mineral oils and aliphatic hydrocarbons (73)Fuels, mineral oils and aliphatic hydrocarbons: A 68 % (50)A 68 %Fuels, mineral oils and aliphatic hydrocarbons: B 27 % (20)B 27 %Fuels, mineral oils and aliphatic hydrocarbons: C 3 % (2)Fuels, mineral oils and aliphatic hydrocarbons: D 1 % (1)Vegetable and animal oils, fats, essential oils (45)Vegetable and animal oils, fats, essential oils: A 29 % (13)A 29 %Vegetable and animal oils, fats, essential oils: B 71 % (32)B 71 %Halogenated hydrocarbons (70)Halogenated hydrocarbons: A 49 % (34)A 49 %Halogenated hydrocarbons: B 31 % (22)B 31 %Halogenated hydrocarbons: C 11 % (8)CHalogenated hydrocarbons: D 9 % (6)DFoods and beverages (46)Foods and beverages: A 61 % (28)A 61 %Foods and beverages: B 39 % (18)B 39 %
A very good resistanceB good resistanceC limited resistanceD not resistant
Share of each rating at 20 °C among the source rows of a class. The number in brackets is the number of rated rows; a row is one chemical at one concentration. Classes with fewer than 8 rated rows are left out.
Showing 956 chemicals
Chemical Concentration 20°C 50°C CAS
Alkaline Exhaust Gases
Abgase, alkalisch
—A*–—
Hydrogen Fluoride Exhaust Gases
Abgase, fluorwasserstoffhaltig
low concentrationD*–—
Carbon Dioxide Exhaust Gases
Abgase, kohlendioxidhaltig
low concentrationA*–—
Nitrous Exhaust Gases
Abgase, nitrosehaltig
low concentrationD*–—
Hydrochloric Acid Exhaust Gases
Abgase, salzsäurehaltig
any concentrationD*–—
Sulfur Dioxide Exhaust Gases
Abgase, schwefeldioxidhaltig
low concentrationD*–—
Sulfuric Acid Exhaust Gases
Abgase, schwefelsäurehaltig
any concentrationD*–—
Sulfur Trioxide Exhaust Gases
Abgase, schwefeltrioxidhaltig
low concentrationD*–—
Acetaldehyd
40 %B–75-07-0
Acetaldehyd
technical gradeB–75-07-0
Acetamide
Acetamid
saturatedA–60-35-5
Aceton
—AC67-64-1
Acetonitril
—C*–75-05-8
Acetophenon
—A–98-86-2
Acetyl Chloride
Acetylchlorid
100 %DD75-36-5
Acetylen
100 %A–74-86-2
Acetylsalicylic Acid (Aspirin)
Acetylsalicylsäure
100 %C*–50-78-2
Acrylnitril
—C*–107-13-1
Adipinsäure
saturatedAC124-04-9
Akkusäure
38 %DD7664-93-9
Alanine
Alanin
—A*–56-41-7
Allyl Acetate
Allylacetat
100 %B*–591-87-7
Allylalkohol
96 %B*–107-18-6
Allyl Chloride
Allylchlorid
100 %B*–107-05-1
Allyl Mustard Oil
Allylsenföl
—B*–57-06-7
Aluminum Hydroxide Acetate
Aluminium(hydroxid)acetat
aqueousA–139-12-8
Aluminum Ammonium Sulfate
Aluminiumammoniumsulfat
saturatedCD7784-26-1
Aluminiumchlorid
10 %CD7784-13-6
Aluminiumchlorid
saturatedDD7784-13-6
Aluminiumchlorid
solidDD7784-13-6
Aluminum Fluoride
Aluminiumfluorid
aqueousCD7789-18-1
Aluminiumhydroxid
—AA21645-51-2
Aluminiumnitrat
aqueousCD13473-90-0
Aluminiumoxid
solidAA1344-28-1
Aluminiumsulfat
10 %CD10043-01-3
Aluminiumsulfat
saturatedCD10043-01-3
Ameisensäure
3 %BD64-18-6
Ameisensäure
50 %DD64-18-6
Ameisensäure
98-100 %DD64-18-6
Glycine
Aminoessigsäure
10 %AA56-40-6
Ammoniumacetat
saturatedA*–631-61-8
Ammoniumcarbonat
50 %B*–10361-29-2
Ammoniumcarbonat
aqueousB*–10361-29-2
Ammoniumchlorid
aqueousBC12125-02-9
Ammoniumchlorid
solidBC12125-02-9
Ammonium Dihydrogen Phosphate
Ammoniumdihydrogenphosphat
any concentrationB*–7722-76-1
Ammonium Iron(II) Sulfate
Ammoniumeisen-(II)-sulfat
—C*–7783-85-9
Ammonium Iron(III) Sulfate
Ammoniumeisen-(III)-sulfat
saturatedC*–7783-83-7
Ammoniumfluorid
aqueousB*–12125-01-8
Ammoniumfluorid
saturatedB*–12125-01-8

* = estimated rating in the source, given without a temperature. L = risk of pitting or stress-corrosion cracking. Only chemicals with a rating for this material are listed.

Acetal (POM) Properties

Full Name Polyoxymethylene (POM)
Brand Names Delrin®, Celcon®
Max Temperature 100°C (212°F)
Key Property Low friction, high stiffness

Common Applications

Precision Parts

Gears, bearings, valve bodies, pump components

Fuel Components

Fuel system parts, carburetor components

Fittings

Plumbing fittings, connectors, fasteners

Not Recommended For

Acetal (POM) may degrade when exposed to:

  • Strong acids (sulfuric, nitric, HCl)
  • Strong oxidizers
  • Phenol
  • Chlorinated solvents at elevated temperatures

Tip: POM is attacked by strong acids. For acid resistance, use HDPE, PP, or PTFE.

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