---
title: "Does POM (acetal / Delrin) float in water? No"
description: "POM (acetal / Delrin) sinks — its density is 1,410 kg/m³ against water's 1,000. Why density and not weight decides it."
url: https://atoneplace.net/does-it-float/pom/
site: "At One Place"
---

# Does POM (acetal / Delrin) float?

**Does POM (acetal / Delrin) float?: No**

1,410 kg/m³ against water's 1,000

POM (acetal / Delrin) sinks. At 1,410 kg/m³ it is 1.41 times denser than water.

## Why

Floating is decided by density alone — mass divided by volume — compared against the fluid. Weight has nothing to do with it directly: a 200-tonne ship floats and a 2-gram pebble sinks, because the ship encloses enough air to bring its average density below that of water. That is also the only reason a steel hull works.

## The numbers

- **Density:** 1,410 kg/m³ (1,400–1,420)
- **Relative to fresh water:** 1.410×
- **Floats in fresh water:** No
- **Floats in seawater:** No

## Compared with other materials

| Material | Density | Floats |
| --- | --- | --- |
| leather | 900 kg/m³ | Yes |
| polypropylene | 905 kg/m³ | Yes |
| ice | 917 kg/m³ | Yes |
| LDPE | 920 kg/m³ | Yes |
| natural rubber | 950 kg/m³ | Yes |
| HDPE | 955 kg/m³ | Yes |
| ebony | 1,000 kg/m³ | No |
| water | 1,000 kg/m³ | No |
| ABS | 1,050 kg/m³ | No |
| polystyrene | 1,050 kg/m³ | No |

## Common questions

### Does POM (acetal / Delrin) float in water?

No — at 1,410 kg/m³ it is denser than water's 1,000.

### Does weight decide whether something floats?

No, density does. A 200-tonne ship floats and a small pebble sinks, because the ship encloses enough air to bring its average density below water.

## Related pages

- [POM (acetal / Delrin) properties](https://atoneplace.net/material/pom/)
- [Does air float?](https://atoneplace.net/does-it-float/air/)
- [Does expanded polystyrene foam float?](https://atoneplace.net/does-it-float/eps-foam/)
- [Does rigid polyurethane foam float?](https://atoneplace.net/does-it-float/polyurethane-foam/)
- [Does EVA foam float?](https://atoneplace.net/does-it-float/eva-foam/)
- [Does balsa float?](https://atoneplace.net/does-it-float/balsa/)
- [Does corrugated cardboard float?](https://atoneplace.net/does-it-float/cardboard/)
- [Does cork float?](https://atoneplace.net/does-it-float/cork/)
- [Does western red cedar float?](https://atoneplace.net/does-it-float/cedar/)

## Sources

- Typical range compiled from manufacturer specifications — At One Place (/about/)