Summary
- ECTFE/ETFE is rated better with
- Halogenated hydrocarbons (+97 points); Fuels, mineral oils and aliphatic hydrocarbons (+70 points); Ketones and aldehydes (+63 points); Esters and ethers (+59 points); Amines and nitrogen compounds (+50 points); Oxidising agents and halogens (+33 points); Mineral acids (+29 points); Organic acids (+15 points)
- Within 10 points of each other
- Alkalis; Salts and salt solutions; Alcohols and glycols; Foods and beverages
Points are the difference in the share of rows rated A or B.
The two materials
PMP
Polymethylpentene (TPX)
Polymethylpentene (TPX) is a transparent polyolefin used for labware. It resists many acids and alkalis, while aromatic and chlorinated solvents and strong oxidisers attack it.
Rated rows: 416. A 55 %, B 6 %, C 7 %, D 32 %
ECTFE/ETFE
Ethylene chlorotrifluoroethylene / ethylene tetrafluoroethylene
ECTFE and ETFE are tough fluoropolymers with broad resistance. Hot amines and some chlorinated solvents at elevated temperature are their main limits.
Rated rows: 374. A 94 %, B 6 %, C 0 %, D 0 %
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 | PMP: rated A or B | ECTFE/ETFE: rated A or B |
|---|---|---|
| Mineral acids | 71 % (35 rows) | 100 % (37 rows) |
| Organic acids | 85 % (26 rows) | 100 % (33 rows) |
| Alkalis | 100 % (17 rows) | 100 % (14 rows) |
| Salts and salt solutions | 100 % (67 rows) | 100 % (114 rows) |
| Oxidising agents and halogens | 67 % (30 rows) | 100 % (17 rows) |
| Alcohols and glycols | 96 % (28 rows) | 100 % (25 rows) |
| Ketones and aldehydes | 37 % (27 rows) | 100 % (14 rows) |
| Esters and ethers | 36 % (42 rows) | 95 % (20 rows) |
| Amines and nitrogen compounds | 50 % (10 rows) | 100 % (9 rows) |
| Aromatic hydrocarbons | 10 % (10 rows) | – |
| Fuels, mineral oils and aliphatic hydrocarbons | 30 % (37 rows) | 100 % (13 rows) |
| Vegetable and animal oils, fats, essential oils | 29 % (14 rows) | – |
| Halogenated hydrocarbons | 3 % (33 rows) | 100 % (16 rows) |
| Foods and beverages | 100 % (13 rows) | 100 % (26 rows) |
Where the ratings differ most
Rows where the two ratings at 20 °C are at least two grades apart: 52 in total, the first 40 shown.
| Chemical | Concentration | PMP | ECTFE/ETFE |
|---|---|---|---|
| 1,3-Butadiene | D | A | |
| Acetophenone | D | A | |
| Amyl Chloride | D | A | |
| Benzyl Alcohol | D | A | |
| Bromine | D | A | |
| Butyric Acid | D | A | |
| Carbon Disulfide | D | A | |
| Carbon Tetrachloride | D | A | |
| Cedar Oil | D | A | |
| Chlorine Water | D | A | |
| Chlorobenzene | D | A | |
| Chromic-Sulfuric Acid | concentrated | D | A |
| Cinnamon Oil | D | A | |
| Cresol | D | A | |
| Cumene | D | A | |
| Cyclohexane | D | A | |
| Decahydronaphthalene | D | A | |
| Diethyl Ether | technical grade | D | A |
| Diethylbenzene | D | A | |
| Ethyl Acetate | 100 % | D | A |
| Ethylene Dichloride | D | A | |
| Hydrobromic Acid | 50 % | D | A |
| Nitrobenzene | D | A | |
| Perchloroethylene (PCE) | D | A | |
| Propane | gaseous | D | A |
| Sulfur Dioxide | liquid | D | A |
| Thionyl Chloride | technical grade | D | A |
| Trichloroethane | D | A | |
| Trichloroethylene (TCE) | 100 % | D | A |
| 1,2-Dichlorobenzene | C | A | |
| Acetic Acid | 10 % | C | A |
| Acetonitrile | C | A | |
| Acrylonitrile | C | A | |
| Aqua Regia | C | A | |
| Bitter Orange Oil | C | A | |
| Bromobenzene | D | B | |
| Bromoform | D | B | |
| Butyl Acetate | 100 % | C | A |
| Chloroethane (Ethyl Chloride) | C | A | |
| Chloroform | 100 % | 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
Frequently Asked Questions
Is PMP or ECTFE/ETFE more chemical-resistant?
Of 249 chemicals rated for both materials at 20 °C, PMP and ECTFE/ETFE share the same rating in 172 rows (69 %). PMP is rated better in 3 rows and ECTFE/ETFE in 74 rows.
How do PMP and ECTFE/ETFE compare for chemical resistance?
Based on 249 chemicals tested for both: PMP is rated better with –. ECTFE/ETFE is rated better with Halogenated hydrocarbons, Fuels, mineral oils and aliphatic hydrocarbons, Ketones and aldehydes, Esters and ethers. They perform similarly with Alkalis, Salts and salt solutions, Alcohols and glycols, Foods and beverages.
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.