Summary
- HDPE is rated better with
- Ketones and aldehydes (+63 points); Mineral acids (+59 points); Alkalis (+55 points); Oxidising agents and halogens (+49 points); Organic acids (+25 points); Esters and ethers (+16 points); Amines and nitrogen compounds (+12 points)
- PETG is rated better with
- Vegetable and animal oils, fats, essential oils (+29 points); Halogenated hydrocarbons (+22 points); Fuels, mineral oils and aliphatic hydrocarbons (+19 points)
- Within 10 points of each other
- 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
HDPE
High-density polyethylene
High-density polyethylene resists most aqueous acids, alkalis and salt solutions. Strong oxidising acids, chlorinated solvents and aromatic hydrocarbons attack or swell it. Continuous service is usually limited to about 80 °C.
Rated rows: 686. A 82 %, B 3 %, C 9 %, D 6 %
PETG
Polyethylene terephthalate glycol (co-polyester)
PETG is a co-polyester for clear containers. Strong acids and alkalis and most organic solvents attack it.
Rated rows: 619. A 55 %, B 23 %, C 4 %, D 18 %
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 | HDPE: rated A or B | PETG: rated A or B |
|---|---|---|
| Mineral acids | 79 % (56 rows) | 20 % (41 rows) |
| Organic acids | 95 % (58 rows) | 70 % (33 rows) |
| Alkalis | 100 % (22 rows) | 45 % (20 rows) |
| Salts and salt solutions | 100 % (193 rows) | 100 % (159 rows) |
| Oxidising agents and halogens | 78 % (40 rows) | 29 % (38 rows) |
| Alcohols and glycols | 93 % (43 rows) | 100 % (40 rows) |
| Phenols | 62 % (8 rows) | – |
| Ketones and aldehydes | 84 % (19 rows) | 21 % (24 rows) |
| Esters and ethers | 73 % (37 rows) | 57 % (28 rows) |
| Amines and nitrogen compounds | 90 % (21 rows) | 78 % (9 rows) |
| Aromatic hydrocarbons | 33 % (9 rows) | – |
| Fuels, mineral oils and aliphatic hydrocarbons | 79 % (38 rows) | 98 % (65 rows) |
| Vegetable and animal oils, fats, essential oils | 71 % (21 rows) | 100 % (34 rows) |
| Halogenated hydrocarbons | 10 % (31 rows) | 32 % (25 rows) |
| Foods and beverages | 100 % (32 rows) | 100 % (43 rows) |
Where the ratings differ most
Rows where the two ratings at 20 °C are at least two grades apart: 86 in total, the first 40 shown.
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 HDPE or PETG more chemical-resistant?
Of 481 chemicals rated for both materials at 20 °C, HDPE and PETG share the same rating in 256 rows (53 %). HDPE is rated better in 190 rows and PETG in 35 rows.
How do HDPE and PETG compare for chemical resistance?
Based on 481 chemicals tested for both: HDPE is rated better with Ketones and aldehydes, Mineral acids, Alkalis, Oxidising agents and halogens. PETG is rated better with Vegetable and animal oils, fats, essential oils, Halogenated hydrocarbons, Fuels, mineral oils and aliphatic hydrocarbons. They perform similarly with 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.