POM
also called Acetal
Polyoxymethylene (Acetal)
3 products from 3 makers. Bambu Lab does not list this material for the H2C; Printing on the H2C, below, gives the conditions it prints under.
- Tensile modulus (XY)
- 1.87GPa
- one product
- Tensile strength (XY)
- 57.5MPa
- 2 products · 50–65
- Not published:
- tensile strength (Z),
- Not published:
- notched Charpy impact.
- HDT at 0.45 MPa
- 100°C
- as published · test bar not described as printed, or no stated test load
- Price
- 121CAD/kg
- one product
POM / Acetal is polyoxymethylene, also called acetal. Makers sell it for functional technical parts, snap connections and gears. It is semicrystalline. On the H2C most products print at 220–240 °C, but some ask for more bed heat than the H2C gives, and a maker warns that formaldehyde is released if the processing temperature is too high.
Thinly documented Three products, with values from 4 makers' documents. No document describes its heat deflection bars as printed, so HDT at 0.45 MPa is shown as published and not ranked against other materials. Read each figure as a few sheets' word.
On the H2C
Printing in full- Nozzle
- 220–240 °C
- most products that give one
- Bed
- 100–130 °C
- most products that give one
- Heated chamber
- 70–140 °C
- one product; beyond the H2C's 65 °C
- Drying
- 80–140 °C, 4–6 h
- 2 of 3 products call for it
- Nozzle type
- not stated
Beyond the H2C's limits (nozzle 350 °C, bed 120 °C, heated chamber 65 °C): bed for 1 product and chamber for 1 product.
Among the materials
Against PLA, POM / Acetal is 28 % stronger flat. Against OBC, POM / Acetal is 4.8 times as strong flat. Among the materials, POM / Acetal has a high elongation at break (XY) and density: both are in the top quarter of the materials that publish them. The rest of its key properties sit in the middle half.
Against its alternatives, POM has the highest tensile strength
How does it compare with what an engineer would buy instead?
- POM: its products' median and middle half
- an alternative
- lowest to highest
- each material's median (top row)
- set apart: test bar not described as printed, or no stated load
- beyond the scale
Each row is a material, each column a property: the bar is the middle half of a material's products, the tick their median, the hairline their lowest to highest; the ticks above the rows are every material's median.
The figure as a table
| Material | Modulus (XY) (GPa) | Strength (XY) (MPa) | Strength (Z) (MPa) | Notched Charpy (kJ/m²) | HDT 0.45 MPa (°C) | Price (CAD/kg) |
|---|---|---|---|---|---|---|
| POM (this material) | 1.87 · 1 | 57.5 · 2 | — | — | 100 as published (1) | 121 · 1 |
| PCL | 0.35 as published (2) | 45 · 1 | — | — | 57 · 1 | 234 · 1 |
| PVDF | 2.45 · 1 | 51 · 1 | — | — | 158 · 1 | 356 · 1 |
| PLA | 2.58 (2–2.88) · 61 | 45 (39.5–53) · 83 | 30.3 (22.1–34) · 40 | 6 (3.97–7.9) · 14 | 56 (53–58) · 50 | 33 (28–40) · 27 |
| OBC | 0.2 · 1 | 12 · 2 | 11 · 3 | 15 · 1 | — | — |
| PA12 | 1.4–1.5 as published (6) | 45–60 as published (6) | — | 7–14 as published (4) | 100–135 as published (4) | 183 · 2 |
POM publishes no tensile strength (Z) or notched Charpy impact. Its HDT at 0.45 MPa states no orientation, so it is drawn as published.
Mechanical properties
Printed flat (XY), POM / Acetal typically reaches a tensile strength of 57.5 MPa at a modulus of 1.87 GPa, and breaks at 23 % elongation. In bending, its flexural strength is typically 84 MPa at a flexural modulus of 2.45 GPa.
| As each sheet publishes it | Grupa Azoty Tarfuse POM | Yousu POM | Fabru Polyoxymethylen (POM) |
|---|---|---|---|
| Tensile strength (XY) | 50 MPa | 65 MPa | 43 MPanot described as printed |
| Tensile modulus (XY) | 1.87 GPa | not published | 1.05 GPanot described as printed |
| Elongation at break (XY) | 11 % | 35 % | 50 %not described as printed |
Not published for POM / Acetal: strength across the layers and notched impact.
Thermal properties
Its glass transition is -50 °C. As published, Vicat softening is 116–160 °C, from one product and melting 165–178 °C, from one product.
| As each sheet publishes it | Grupa Azoty Tarfuse POM | Yousu POM | Fabru Polyoxymethylen (POM) |
|---|---|---|---|
| HDT at 0.45 MPa | not published | not published | 100 °Cnot described as printed |
| HDT at 1.8 MPa | not published | 96 °C | not published |
| Glass transition (Tg) | -50 °C | not published | not published |
Printing on the H2C
POM's heated chamber runs past what the H2C gives
What does printing it on the H2C take, and how hot can a part get?
- share of the products that accept each temperature
- what most products accept
- the H2C's limit, and beyond it
- a product
- POM: its products' median and middle half
- as published, under each sheet's own test
Printing it on the H2C
In service
°C
One temperature axis for the settings a print needs and the temperatures a part meets. A setting's shade is how many of the products whose sheets give a window accept each degree; the H2C's limit closes its row.
The figure as a table
| Setting or property | Most products, or the median | Products | H2C limit |
|---|---|---|---|
| Nozzle | 220–240 °C | 3 | 350 °C |
| Bed | 100–130 °C | 3 | 120 °C |
| Heated chamber | 70–140 °C | 1 | 65 °C |
| Drying | 80–140 °C, 4–6 h | 2 | — |
| Glass transition (Tg) | -50 °C | 1 | — |
| HDT at 1.8 MPa | 96 °C | 1 | — |
| Vicat softening temperature | 116 °C | 1 | — |
| Melting temperature | 165–170 °C | 1 | — |
Windows read from the Bambu Lab Filament Guide are not shaded: the guide speaks for every product that reads it.
| Setting | Grupa Azoty Tarfuse POM | Yousu POM | Fabru Polyoxymethylen (POM) |
|---|---|---|---|
| Nozzle | 210–240 °C | 220–240 °C | 190–210 °C |
| Bed | 100–130 °C | 100–120 °C | 120–150 °C |
| Heated chamber | 70–140 °C | not published | not published |
| Drying | 140 °C for 4–6 h | not published | 80 °C for 4 h |
| Nozzle type | not stated | not stated | not stated |
What makers say about printing it
Warping and shrinkage
Shrinkage (ISO 294-4) 0.95 %
Fabru Polyoxymethylen (POM), data sheet, p. 1Shrink Ratio % 0.02
Yousu POM, data sheet, p. 1relatively high shrinkage
Fabru Polyoxymethylen (POM), data sheet, p. 1
Moisture sensitivity
To ensure good print quality, it is recommended to dry in a hot air dryer for 4 to 6 hours in 140°C.
Grupa Azoty Tarfuse POM 3D Filament, data sheet, p. 1POM has low moisture absorption and high gas density.
Fabru Polyoxymethylen (POM), data sheet, p. 1
More from makers: odour and emissions
Odour and emissions
If the processing temperature is too high, formaldehyde is released
Fabru Polyoxymethylen (POM), data sheet, p. 1
Products
Three products from three makers: Fabru, Grupa Azoty and Yousu.
Uses, limitations and chemicals
What it is sold for
Tarfuse® POM is designed for printing functional technical parts, due to the material features dedicated to printing parts up to 100mm.
Grupa Azoty Tarfuse POM 3D Filament, data sheet, p. 1POM filament is therefore one of the preferred construction materials, e.g. B. for snap connections and gears.
Fabru Polyoxymethylen (POM), data sheet, p. 1optimal for snap connections
Fabru Polyoxymethylen (POM), data sheet, p. 1
What makers warn about
They are not resistant to concentrated acids and hydrofluoric acid as well as oxidizing agents.
Fabru Polyoxymethylen (POM), data sheet, p. 1The weather resistance is not good.
Fabru Polyoxymethylen (POM), data sheet, p. 1
Chemicals and environment
| Exposure | What makers say |
|---|---|
| UV and outdoor | Described in words, with no rating, in its one statement |
| Organic solvent resistance | Described in words, with no rating, in its one statement |
Makers rarely give the concentration, temperature or duration: treat them as indications, not design data. Each product's statements are on its card.
Where no maker of these products speaks to an exposure, reference data for plain POM resin is shown. Fillers, pigments and printing change it, so it does not stand for these products.
| POM resin | Verdict | Agents |
|---|---|---|
| Acid resistance | limited | Weak acids and weak bases (pH 4-9) (resistant), Strong acids and oxidizing agents (not resistant), Acetic Acid, 5 % (resistant) and Hydrochloric Acid, 10 % (not resistant) |
| Alkali resistance | not resistant | Strong bases (not resistant) and Sodium Hydroxide, 10 % (not resistant) |
| Oil and grease resistance | resistant | Hydrocarbons (gasolines, lubricants, hydraulic fluids) (resistant), Gasolines (Exxon Regular) (resistant) and Motor oil (Exxon "Uniflo" 10W30) (resistant) |
| Water solubility | resistant | Water (resistant) |
| Hydrolytic stability | not resistant | Steam or hot water, repeated use (not resistant) |
| Flammability | not resistant | UL 94 classification, all grades of Delrin (not resistant) |
Density and price
Its three products give a density of 1,140–1,420 kg/m³. One product has a sampled price: Grupa Azoty Tarfuse POM 3D Filament at 121 CAD/kg, from filamentworld.de's listing in EUR, converted at the Bank of Canada rate of 29 Sep 2026. No Canadian shop in the sample sells it.
| As each sheet publishes it | Grupa Azoty Tarfuse POM | Yousu POM | Fabru Polyoxymethylen (POM) |
|---|---|---|---|
| Density | 1,420 kg/m³ | 1,140 kg/m³ | 1,340 kg/m³ |
| Price | 121 CAD/kg | not published | not published |
Regular prices, never sale prices, from 9 Canadian shops and 10 foreign shops, sampled 10 Sep–20 Oct 2026, not live; shipping and tax are not included.
Other properties, as published
8 more properties are published, each under its own sheet's test conditions, so they are listed, not ranked.
The 8 properties, lowest to highest
| Property | Products | Lowest–highest |
|---|---|---|
| Melt mass-flow rate | 2 | 2–6 g/10 min |
| Mould shrinkage | 2 | 0.02–0.95 % |
| Crystallization temperature | 1 | 140 °C |
| Dielectric strength | 1 | 19 kV/mm |
| Elongation at yield | 1 | 30 % |
| Impact strength, test unclear | 1 | 7 kJ/m² |
| Melt volume-flow rate | 1 | 2.5 cm³/10 min |
| Water absorption | 1 | 0.2 % |
Estimated values
No product publishes a HDT at 0.45 MPa that can be ranked, so the selector estimates it from the products' related values and similar materials. An estimate is a range, never a product's value, and nothing above rests on it.
| Property | Likely | Plausible | Precision | Beside what is published |
|---|---|---|---|---|
| HDT at 0.45 MPa | 66–116 °C | 54–123 °C | 50 °C between its ends | one product gives 100 °C without a stated test load, inside it |
What likely and plausible mean
Tested against known values, a likely range held the true value 8 times in 10, and a plausible range 19 times in 20. How the estimates are made.
Sources
7 documents from 5 publishers (3 data sheets, 2 makers' product pages and guides, 1 resin supplier's data sheet and 1 printer document), read 10 Sep–28 Sep 2026. Each value on POM / Acetal's Products page names its document and page, and links to the original.
Bambu Lab, H2C Filamant Printing Guide (the H2C's printer guide): print settings for 3 products.
Every document (7), by publisher
| Publisher | Documents | Values | Products |
|---|---|---|---|
| Yousu | 2 | 11 | 1 |
| Fabru | 2 | 9 | 1 |
| DuPont | 1 | 9 | 1 |
| Grupa Azoty | 1 | 9 | 1 |
- Bambu Lab, H2C Filamant Printing Guide | Bambu Lab Wiki
- DuPont, Product Information Delrin 100P NC010
- Fabru, Polyoxymethylen (POM)
- Fabru, purefil POM Filament | Fabru GmbH
- Grupa Azoty, Preliminary Technical Data Sheet Tarfuse POM 3D Filament
- Yousu, 3D printing tips,3d printer filament
- Yousu, Yousu POM 3D Filament Technical Data Sheet