PC or ABS? 5 Criteria for Choosing the Right Material

Polycarbonate (PC) and ABS are both amorphous thermoplastics — they have a softening range rather than a sharp melting point, and their shrinkage is low and predictable. Beyond that, they diverge significantly.

PC has one of the highest impact strengths among engineering plastics and can offer optical clarity. ABS is easier to process, offers high surface quality and dimensional stability, can be plated, and costs markedly less.

The choice is therefore rarely about which is better, but about which requirement the application is pushing hardest.

If the part will be dropped, struck or subjected to sudden loads, PC stands out clearly. ABS can struggle in applications requiring low-temperature impact performance in particular.

Where impact loading is moderate, however, the toughness of ABS is sufficient for most consumer products and the cost advantage becomes decisive.

If you are designing a part that must transmit light, ABS is not an option — it is inherently opaque. PC can offer glass-like clarity, which is decisive in lighting, viewing windows and protective covers.

PC's heat deflection temperature is generally higher than that of standard ABS types. If the part will operate in a hot environment or be exposed to processes such as steam cleaning, PC is the safer choice.

Heat resistant ABS types also exist; if you are looking for a middle ground, these types or PC/ABS alloys can be evaluated.

ABS is very favourable for plating (electroplating) and painting, which is a major advantage in decorative parts. PC can also be painted, but surface preparation and compatibility must be managed more carefully.

PC is sensitive to certain solvents and alkaline environments and carries a risk of stress cracking. If the part will contact cleaning chemicals, oils or solvents, material compatibility must be verified in advance.

This assessment varies by grade; the chemical resistance information in the relevant technical data sheet should be used as the reference.

In many projects the requirement sits exactly between the two: the impact strength and thermal performance of PC are wanted, but so are the processability and cost of ABS. PC/ABS alloys fill precisely this gap and are very common in automotive interior trim and electronic housings.

The balance is tuned through the alloy ratio, which makes grade-level evaluation particularly important when selecting PC/ABS.

The right material is usually not the highest performing one, but the one that meets the real requirements of the application at the most appropriate cost. Once you clarify the service temperature, load type, chemical environment and visual expectations, the choice usually becomes evident.

At Buteo Petrochemicals we have access to LG Chem's LUPOY (PC), LUPOS (styrenics) and PC/ABS alloys. Share your application with us and our technical team will help identify suitable grades and provide TDS and sample support.