Nylon vs POM chemical resistance is usually not a simple winner-loser question. In real parts, moisture, temperature, load, and wear often matter as much as the fluid itself.
If you want the broader nylon view first, start with our nylon chemical resistance guide. If you need a wider cross-material screen, use the engineering plastics compatibility chart.
Bottom line: pick POM first when you need stable fit and low-friction motion in a wet but not extreme environment. Pick nylon first when load, impact, or higher heat is the bigger design problem.
En bref
| État | Nylon | POM / Acétal | Usually Check First |
|---|---|---|---|
| Oils and greases | Often good | Often good | Both can work if temperature is controlled. |
| Fuels | Grade dependent | Often good | POM often looks cleaner on shortlists. |
| Hot water / humidity | Moisture sensitive | Plus stable | POM when dimensional stability matters. |
| Alkaline cleaners | Caution | Caution | Check concentration and soak time. |
| Strong acids | Pauvre | Pauvre | Consider another polymer first. |
| Dry-running wear | Tough and durable | Low friction and stable | POM often wins on sliding feel. |
Where Nylon Usually Wins
Nylon usually comes back into the shortlist when the part needs toughness, impact tolerance, or better heat headroom than a purely low-friction grade. If the part is carrying a load, flexing, or seeing repeated shock, nylon can be the more forgiving choice.
Where POM Usually Wins
POM often looks better when the part must keep size, slide smoothly, and stay predictable in a dry or lightly lubricated assembly. It is also a common first check when moisture uptake is hurting fit more than chemistry is.
Failure Modes That Usually Decide the Choice
When teams choose between nylon and POM, the first failed sample often tells the real story. Nylon usually gives up through swelling, dimensional movement, or loss of repeatability after moisture and fluid exposure combine. POM more often leaves the shortlist when impact, heat, or long-term creep under load become more important than low-friction stability.
- Nylon risk: bore growth or fit shift after conditioning, especially in humid service.
- POM risk: lower confidence in higher-heat structural loading when the geometry is thin or highly stressed.
- Shared risk: both materials can still fail in strong acids, hot oxidizing cleaning cycles, or poorly controlled solvent exposure.
Engineering Rule
Use nylon when you need a tougher structural part. Use POM when you need a more dimensionally stable wear part. If chemical exposure is the main issue, test the actual fluid, temperature, and dwell time before deciding.
What To Validate Before Tooling
A material comparison only becomes useful when it is tied to the real assembly. For nylon vs POM, the practical review should include more than the fluid name.
- Whether the part is load-bearing, snap-fit, or only positional.
- Installed clearance before and after humidity or fluid conditioning.
- Shaft finish, lubrication method, and dry-running duty for wear parts.
- Maximum service temperature, not just room-temperature exposure.
- Cycle type: splash, wipe, soak, or continuous contact.
Typical Application Example
A small bush or spacer running dry inside a lightly lubricated mechanism is often a POM-first conversation because dimensional stability and sliding feel matter most. A clip, bracket, or structural support with the same fluid exposure may still stay in nylon territory if it needs more toughness or heat margin.
Lire la suite
- Nylon chemical compatibility chart
- Nylon chemical resistance guide
- POM injection molding guide
- Nylon moisture absorption
FAQ
Is POM more chemical resistant than nylon?
Sometimes, especially where moisture and dimensional stability matter. But the answer depends on the exact chemical, temperature, and load.
Is nylon better than acetal for wear parts?
Nylon is often tougher, while POM is often more stable in sliding use. The better choice depends on whether impact or low-friction repeatability matters more.
Can nylon replace POM in chemical contact?
Yes in some cases, but not by default. Check the fluid, soak time, and whether the part is loaded or dimension-critical.
When should both be avoided?
Strong acids, aggressive oxidizers, and hot wash cycles usually push both materials out of the first-choice range.
If you are moving from material screening to production, review our nylon engineering plastics page for grade options, nylon injection molding services for molded parts, nylon CNC machining services for machined parts, and nylon 3D printing service for prototypes or low-volume functional parts.
Need a material comparison review?
Send the fluid, temperature, load, and part geometry. We can help compare nylon and acetal before tooling starts.
