Polypropylene vs Polycarbonate: Which to Specify
Polypropylene vs polycarbonate: transparency, impact strength, heat and chemical resistance, cost — a B2B decision table for machine guards, tanks, enclosures and formed parts.
Polypropylene (PP) and polycarbonate (PC) get shortlisted for the same B2B jobs — machine guards, tanks and enclosures, chemical-handling parts, formed components — but they behave very differently. This guide compares them on the properties that decide a specification, then gives a decision table so buyers and engineers can choose the right sheet before requesting a quote.
Polypropylene vs Polycarbonate: Quick Answer
Choose polycarbonate when you need transparency, high impact strength, dimensional precision or heat resistance. Choose polypropylene when you need chemical resistance, low cost, low weight, or a material that tolerates repeated flexing and welding — and clarity is not required. The two are complementary, not interchangeable.
Property Comparison
| Property | Polypropylene (PP) | Polycarbonate (PC) |
|---|---|---|
| Transparency | Translucent to opaque | Optically clear (up to ~90%) |
| Impact strength | Moderate; good living-hinge fatigue | Very high (~200× glass); stays tough at low temp |
| Max service temperature | ~100 °C | ~120–135 °C |
| Chemical resistance | Excellent (acids, bases, solvents) | Fair; attacked by some solvents and strong bases |
| Density | ~0.905 g/cm³ (floats) | ~1.20 g/cm³ |
| Fabrication | Weldable, thermoformable, machinable | Machinable, cold-formable, thermoformable; not weldable |
| UV resistance (outdoor) | Needs additives; limited | Co-extruded UV grade lasts years outdoors |
| Relative cost | Lower | Higher |
Where Polycarbonate Wins
- Transparent guards and windows: when an operator must see through the part, PC is the only real option — see our machine guard and polycarbonate windows pages.
- Impact and safety: for anti-vandal glazing, safety screens and equipment covers that must not shatter.
- Heat and dimensional stability: higher service temperature and tighter tolerances for precision enclosures.
Where Polypropylene Wins
- Chemical tanks and ducting: PP shrugs off acids, bases and many solvents that would craze PC.
- Living hinges and flexed parts: PP tolerates millions of flex cycles without cracking.
- Weight- and cost-sensitive parts: lighter and cheaper where clarity and high impact are not required.
Decision Table by Application
| If your part needs… | Specify |
|---|---|
| See-through guard, cover or window | Polycarbonate |
| Contact with aggressive chemicals | Polypropylene |
| Maximum impact / anti-vandal | Polycarbonate |
| Welded fabrication or living hinge | Polypropylene |
| Outdoor clarity with UV exposure | Polycarbonate (UV grade) |
| Lowest material cost, opaque part | Polypropylene |
A Note on PC Alternatives
If you have already ruled PP out and are comparing PC against acrylic or glass, see our companion guides on polycarbonate vs acrylic and the polycarbonate sheet range. For the same polymer at factory pricing against a branded spec, see our Lexan® equivalent sheet.
Get a Material Recommendation
Not sure which fits your part? Send the application, operating temperature, chemicals in contact, impact requirement and whether transparency is needed — Plastura returns a material recommendation and a quote for polycarbonate sheet or fabricated parts within 8 working hours. Request a B2B quote.
FAQ
Is polypropylene stronger than polycarbonate? No — polycarbonate has far higher impact strength (about 200× glass). Polypropylene’s advantage is fatigue resistance in flexing parts and chemical resistance, not raw impact strength.
Is polypropylene or polycarbonate more chemical resistant? Polypropylene, clearly. It resists acids, alkalis and many solvents that can craze or attack polycarbonate.
Which is more heat resistant, PP or PC? Polycarbonate, with a service temperature around 120–135 °C versus roughly 100 °C for polypropylene.
Can polypropylene replace polycarbonate? Only where transparency and high impact are not required. For clear guards, windows and safety glazing, polycarbonate has no PP substitute.
References & Standards
Reviewed by the Plastura engineering team — Jiangsu Xinjincheng New Materials Co., Ltd. is the factory behind Plastura, supplying polycarbonate sheet to distributors, fabricators and OEMs in 30+ countries. IATF 16949 conformity for polycarbonate sheet processing, excluding product design. Values below are typical for extruded PP and PC; confirm against the datasheet for the specific grade. Last reviewed July 2026.
- ISO 180 / ISO 179 — Plastics: Izod and Charpy impact strength (impact comparison).
- ISO 75 — Plastics: temperature of deflection under load (service-temperature comparison).
- ISO 1183 — Plastics: methods for determining density (0.905 vs 1.20 g/cm³).
- ISO 175 / ISO 22088 — Plastics: resistance to liquid chemicals and environmental stress cracking (chemical-resistance comparison).
- ISO 4892-2 — Plastics: xenon-arc weathering (outdoor UV performance).
Request a project-specific recommendation
Send the sheet type, dimensions, quantity, application and required performance. Plastura will review the inputs needed for a comparable quotation.