These three engineering resins cover a huge share of molded parts, and they're often weighed against each other. Here's how they actually differ and when each wins.
The quick comparison
| Property | ABS | Polycarbonate | Nylon (PA) |
|---|---|---|---|
| Impact | Good | Very high | Good (toughened: high) |
| Stiffness/strength | Moderate | Moderate-high | High (glass-filled: very high) |
| Heat resistance | Low-moderate | Good | Good-excellent (GF) |
| Clarity | Opaque | Transparent | Opaque |
| Chemical resistance | Moderate | Moderate | Good (fuels/oils) |
| Moisture sensitivity | Low | Low | High (absorbs water) |
| Relative cost | Low-moderate | Moderate-high | Moderate |
Choose ABS when
You want a tough, rigid part with a great cosmetic finish at a moderate price, indoors. Think housings, trim, consumer products. It's easy to mold and finish. Avoid it outdoors without a capped/UV grade.
Choose polycarbonate when
You need transparency and impact together, or a part that must survive abuse and heat. Lenses, guards, glazing, electronic housings. Watch solvent compatibility and specify FR or glass grades as needed.
Choose nylon when
The part is mechanical or structural — gears, connectors, under-hood components — and needs strength, wear and heat resistance. Glass filling unlocks the highest performance. Design around moisture absorption.
Still deciding?
Many parts are well served by a blend (PC/ABS) that splits the difference. Tell us the requirement and we'll recommend and source the right grade — see our ABS, polycarbonate and nylon pages, or request a quote.