Summary
- Within 10 points of each other
- Mineral acids; Organic acids; Alkalis; Salts and salt solutions; Oxidising agents and halogens; Alcohols and glycols; Ketones and aldehydes; Esters and ethers; Amines and nitrogen compounds; Fuels, mineral oils and aliphatic hydrocarbons; Halogenated hydrocarbons; Foods and beverages
Points are the difference in the share of rows rated A or B.
The two materials
FEP
Fluorinated ethylene propylene
FEP has nearly the chemical resistance of PTFE and can be melt-processed. Its service temperature, about 200 °C, is lower than that of PTFE.
Rated rows: 908. A 99 %, B 0 %, C 1 %, D 0 %
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 | FEP: rated A or B | ECTFE/ETFE: rated A or B |
|---|---|---|
| Mineral acids | 100 % (55 rows) | 100 % (37 rows) |
| Organic acids | 100 % (64 rows) | 100 % (33 rows) |
| Alkalis | 100 % (18 rows) | 100 % (14 rows) |
| Salts and salt solutions | 100 % (197 rows) | 100 % (114 rows) |
| Oxidising agents and halogens | 100 % (52 rows) | 100 % (17 rows) |
| Alcohols and glycols | 100 % (57 rows) | 100 % (25 rows) |
| Phenols | 100 % (14 rows) | – |
| Ketones and aldehydes | 100 % (33 rows) | 100 % (14 rows) |
| Esters and ethers | 100 % (69 rows) | 95 % (20 rows) |
| Amines and nitrogen compounds | 100 % (38 rows) | 100 % (9 rows) |
| Aromatic hydrocarbons | 100 % (14 rows) | – |
| Fuels, mineral oils and aliphatic hydrocarbons | 100 % (74 rows) | 100 % (13 rows) |
| Vegetable and animal oils, fats, essential oils | 100 % (47 rows) | – |
| Halogenated hydrocarbons | 90 % (49 rows) | 100 % (16 rows) |
| Foods and beverages | 100 % (46 rows) | 100 % (26 rows) |
Where the ratings differ most
Rows where the two ratings at 20 °C are at least two grades apart: 1 in total.
| Chemical | Concentration | FEP | ECTFE/ETFE |
|---|---|---|---|
| Propylene Oxide | A | C |
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 FEP or ECTFE/ETFE more chemical-resistant?
Of 369 chemicals rated for both materials at 20 °C, FEP and ECTFE/ETFE share the same rating in 346 rows (94 %). FEP is rated better in 21 rows and ECTFE/ETFE in 2 rows.
How do FEP and ECTFE/ETFE compare for chemical resistance?
Based on 369 chemicals tested for both: FEP is rated better with –. ECTFE/ETFE is rated better with –. They perform similarly with Mineral acids, Organic acids, Alkalis, Salts and salt solutions.
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.