Summary
- ECTFE/ETFE is rated better with
- Ketones and aldehydes (+38 points); Alkalis (+36 points); Esters and ethers (+31 points); Halogenated hydrocarbons (+28 points); Amines and nitrogen compounds (+24 points); Oxidising agents and halogens (+13 points); Mineral acids (+13 points)
- Within 10 points of each other
- Organic acids; Salts and salt solutions; Alcohols and glycols; Fuels, mineral oils and aliphatic hydrocarbons; Foods and beverages
Points are the difference in the share of rows rated A or B.
The two materials
PVDF
Polyvinylidene fluoride
PVDF resists acids, halogens and hydrocarbons. Strong bases, amines, ketones and esters attack it. Service temperature is up to about 150 °C.
Rated rows: 944. A 73 %, B 15 %, C 10 %, D 2 %
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 | PVDF: rated A or B | ECTFE/ETFE: rated A or B |
|---|---|---|
| Mineral acids | 87 % (61 rows) | 100 % (37 rows) |
| Organic acids | 94 % (64 rows) | 100 % (33 rows) |
| Alkalis | 64 % (22 rows) | 100 % (14 rows) |
| Salts and salt solutions | 99 % (198 rows) | 100 % (114 rows) |
| Oxidising agents and halogens | 87 % (62 rows) | 100 % (17 rows) |
| Alcohols and glycols | 98 % (58 rows) | 100 % (25 rows) |
| Phenols | 71 % (14 rows) | – |
| Ketones and aldehydes | 62 % (34 rows) | 100 % (14 rows) |
| Esters and ethers | 64 % (66 rows) | 95 % (20 rows) |
| Amines and nitrogen compounds | 76 % (38 rows) | 100 % (9 rows) |
| Aromatic hydrocarbons | 100 % (14 rows) | – |
| Fuels, mineral oils and aliphatic hydrocarbons | 97 % (72 rows) | 100 % (13 rows) |
| Vegetable and animal oils, fats, essential oils | 88 % (48 rows) | – |
| Halogenated hydrocarbons | 72 % (54 rows) | 100 % (16 rows) |
| Foods and beverages | 98 % (46 rows) | 100 % (26 rows) |
Where the ratings differ most
Rows where the two ratings at 20 °C are at least two grades apart: 29 in total.
| Chemical | Concentration | PVDF | ECTFE/ETFE |
|---|---|---|---|
| Chloroacetic Acid | D | A | |
| Chromic-Sulfuric Acid | concentrated | D | A |
| Fluorine | D | A | |
| Sodium Hydroxide (Caustic Soda) | 1 % | D | A |
| Sodium Hydroxide (Caustic Soda) | 50 % | D | A |
| Sulfur Dioxide | liquid | D | A |
| Acetaldehyde | 40 % | D | B |
| Acetaldehyde | technical grade | D | B |
| Acrylonitrile | C | A | |
| Aqua Regia | C | A | |
| Benzyl Acetate | C | A | |
| Diethyl Malonate | C | A | |
| Dimethyl Sulfoxide (DMSO) | C | A | |
| Dimethylformamide (DMF) | D | B | |
| Dioxane | C | A | |
| Ethyl Acetate | 100 % | C | A |
| Ethyl Benzoate | C | A | |
| Ethyl Cyanoacetate | C | A | |
| Ethyl Lactate | C | A | |
| Fluorocarbons (CFCs) | C | A | |
| Isopropyl Acetate | C | A | |
| Potassium Hydroxide | 50 % | C | A |
| Potassium Hydroxide | concentrated | C | A |
| Propylene Oxide | A | C | |
| Resorcinol | 5 % | C | A |
| Resorcinol | saturated | C | A |
| Salicylaldehyde | C | A | |
| Sodium Hypochlorite (Bleach) | 15 % | C | A |
| Thionyl Chloride | technical grade | C | A |
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 PVDF or ECTFE/ETFE more chemical-resistant?
Of 374 chemicals rated for both materials at 20 °C, PVDF and ECTFE/ETFE share the same rating in 305 rows (82 %). PVDF is rated better in 12 rows and ECTFE/ETFE in 57 rows.
How do PVDF and ECTFE/ETFE compare for chemical resistance?
Based on 374 chemicals tested for both: PVDF is rated better with –. ECTFE/ETFE is rated better with Ketones and aldehydes, Alkalis, Esters and ethers, Halogenated hydrocarbons. They perform similarly with Organic acids, Salts and salt solutions, Alcohols and glycols, Fuels, mineral oils and aliphatic hydrocarbons.
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.