Summary
- Nylon (PA) is rated better with
- Alkalis (+15 points)
- Acetal (POM) is rated better with
- Ketones and aldehydes (+38 points); Alcohols and glycols (+29 points); Amines and nitrogen compounds (+24 points); Oxidising agents and halogens (+17 points); Halogenated hydrocarbons (+17 points)
- Within 10 points of each other
- Mineral acids; Organic acids; Salts and salt solutions; Phenols; Esters and ethers; Aromatic hydrocarbons; Fuels, mineral oils and aliphatic hydrocarbons; Vegetable and animal oils, fats, essential oils; Foods and beverages
Points are the difference in the share of rows rated A or B.
The two materials
Nylon (PA)
Polyamide (nylon)
Polyamide (nylon) resists fuels, oils and many solvents. Mineral acids, even dilute, and strong oxidisers attack it, and it absorbs water.
Rated rows: 945. A 44 %, B 21 %, C 17 %, D 18 %
Acetal (POM)
Polyoxymethylene (acetal)
Acetal (POM) resists many organic solvents and fuels. Strong acids and oxidising agents degrade it.
Rated rows: 956. A 41 %, B 32 %, C 12 %, D 15 %
Share of rows rated A or B, by chemical class
How often the two ratings agree
Chemical classes were assigned by this site, not by the source. Mixtures and trade products without a clear class are not counted.
By chemical class
| Chemical class | Nylon (PA): rated A or B | Acetal (POM): rated A or B |
|---|---|---|
| Mineral acids | 5 % (63 rows) | 5 % (63 rows) |
| Organic acids | 25 % (63 rows) | 34 % (64 rows) |
| Alkalis | 91 % (22 rows) | 76 % (21 rows) |
| Salts and salt solutions | 78 % (194 rows) | 76 % (197 rows) |
| Oxidising agents and halogens | 26 % (62 rows) | 43 % (63 rows) |
| Alcohols and glycols | 67 % (58 rows) | 96 % (57 rows) |
| Phenols | 8 % (13 rows) | 0 % (14 rows) |
| Ketones and aldehydes | 53 % (32 rows) | 91 % (35 rows) |
| Esters and ethers | 80 % (65 rows) | 88 % (68 rows) |
| Amines and nitrogen compounds | 50 % (34 rows) | 74 % (38 rows) |
| Aromatic hydrocarbons | 100 % (14 rows) | 100 % (14 rows) |
| Fuels, mineral oils and aliphatic hydrocarbons | 97 % (73 rows) | 96 % (73 rows) |
| Vegetable and animal oils, fats, essential oils | 98 % (46 rows) | 100 % (45 rows) |
| Halogenated hydrocarbons | 63 % (70 rows) | 80 % (70 rows) |
| Foods and beverages | 98 % (46 rows) | 100 % (46 rows) |
Where the ratings differ most
Rows where the two ratings at 20 °C are at least two grades apart: 109 in total, the first 40 shown.
| Chemical | Concentration | Nylon (PA) | Acetal (POM) |
|---|---|---|---|
| Acetic Acid | 10 % | D | A |
| Acetic Acid | 5 % | D | A |
| Benzyl Alcohol | D | A | |
| Calcium Hypochlorite | aqueous | D | A |
| Cetyl Alcohol | 100 % | D | A |
| Chlorobenzene | D | A | |
| Chloromethane (Methyl Chloride) | technical grade | D | A |
| Developer Fluids | D | A | |
| Epichlorohydrin | 100 % | D | A |
| Gear Oil, EP (Hypoid), 110°C | A | D | |
| Iodine Tincture | D | A | |
| Isopropyl Ether | technical grade | D | A |
| Methylamine | 32 % | D | A |
| Perchloroethylene (PCE) | D | A | |
| Photo Developer | D | A | |
| Potassium Permanganate | D | A | |
| Potassium Permanganate | aqueous | D | A |
| Propylene Glycol | D | A | |
| Salicylic Acid | saturated | A | D |
| Soap Solution | any concentration | D | A |
| Sodium Bisulfite | aqueous | A | D |
| Sodium Metabisulfite | any concentration | A | D |
| Tannin | A | D | |
| Tannin | 10 % | A | D |
| Tanning Extracts | A | D | |
| Vegetable Tanning Extracts | usual technical grade | A | D |
| Vinegar | D | A | |
| Acetonitrile | A | C | |
| Acetylsalicylic Acid (Aspirin) | 100 % | A | C |
| Acrylonitrile | A | C | |
| Allyl Acetate | 100 % | D | B |
| Aluminum Chloride | 10 % | A | C |
| Aluminum Nitrate | aqueous | A | C |
| Aluminum Sulfate | 10 % | A | C |
| Ammonium Bifluoride | 50 % | B | D |
| Ammonium Hydroxide (Ammonia Solution) | C | A | |
| Ammonium Hydroxide (Ammonia Solution) | 30 % | C | A |
| Ammonium Iron(III) Sulfate | saturated | A | C |
| Ammonium Persulfate | saturated | D | B |
| Ammonium Persulfate | aqueous | D | B |
Rating scale
- A very good resistance
- B good resistance
- C limited resistance
- D not resistant
- – no data
- K no general statement possible
A rating marked * is an estimate in the source, not a test result. An estimate is given as one value without a temperature.
More comparisons
About this data
The ratings come from the chemical resistance list published by Bürkle GmbH, which compiled them from raw-material manufacturers’ data. They describe laboratory tests on the raw material at 20 °C and 50 °C.
A finished part also sees pressure, mechanical stress, welds and mixtures that a laboratory test does not. Treat the rating as a first filter and test under your own conditions before relying on it.