Plastic Types: ABS, PP, PA, and PC Compared

Not every plastic marketed as "impact-resistant" actually holds up in the field at sub-zero temperatures or after months of UV exposure. Specify a part by the umbrella term "engineering plastic" instead of concrete material properties, and that gap usually only shows up once the housing turns brittle or warps in the field.

In brief: Plastics fall into three basic categories: thermoplastics, thermosets, and elastomers. ABS (Acrylonitrile Butadiene Styrene) is by far the most searched thermoplastic in procurement and shows up in housings, automotive parts, and toys. Depending on the application, though, PP, PA, POM, or PC can be the better technical and economic choice.

What Distinguishes Thermoplastics, Thermosets, and Elastomers?

Plastics split into three basic types based on how they behave under heat: thermoplastics, thermosets, and elastomers. This classification traces back to the classic DIN 7724 system. The standard itself has since been withdrawn, but the terminology remains standard in technical practice.

The decisive difference lies in how the molecular chains are cross-linked. Thermoplastics consist of chains that aren't cross-linked and slide past each other when heated, which is why the material can be melted, reshaped, and recycled. Thermosets are densely cross-linked and don't soften under heat; they decompose instead, so a part that's already cured can't be reshaped afterward. Elastomers sit in between: loosely cross-linked, rubber-elastic, and likewise not meltable.

For procurement, thermoplastics are the group that matters most, since nearly every mass-produced plastic part comes from this category. ABS belongs here, alongside PP, PA, POM, and PC.

What Is ABS Plastic and What Is It Used For?

ABS plastic stands for Acrylonitrile Butadiene Styrene, a copolymer of three monomers in a variable mix ratio. The acrylonitrile share provides hardness and chemical resistance, the butadiene share provides impact strength, and the styrene share provides gloss and processability. Adjusting that mix ratio lets manufacturers tune the material toward toughness, surface gloss, or heat resistance.

In our sourcing projects, ABS is usually the first material customers ask about when they need a housing or trim part manufactured without any special chemical or thermal load. Usually, it comes down to the favorable balance of impact strength, surface hardness, and processing cost.

Typical applications include housings for electronics and household appliances, automotive trim parts and dashboards, and toys. LEGO has manufactured its bricks predominantly from ABS since 1963, precisely for its combination of scratch resistance, color brilliance, and the bricks' well-known "clutch power." Transparent LEGO pieces, by contrast, are made from arMABS, and hinges and connectors from polycarbonate, a reminder that even within a single product, one plastic rarely fits every part.

How Does ABS Compare to Other Plastics?

Whether ABS is the right choice only becomes clear next to other common engineering plastics. The table below puts five materials frequently requested in procurement side by side, based on manufacturer data from Vink Kunststoffe, each measured against standardized test methods (ISO 1183 for density, ISO 62 for water absorption, ISO 179 for notched impact strength, UL746B for continuous use temperature):

Despite its reputation as an especially tough material, PC actually trails ABS and PP on notched impact strength: PC is notch-sensitive, toughness drops sharply at notches or sharp edges, even though unnotched PC parts are practically unbreakable. ABS delivers more even values with notches present and is simpler and cheaper to process. What the table mostly shows is that every property has its own winner.

Which Plastic Fits Which Application?

Material choice should follow the strongest requirement a given part actually faces. PP stands out for its chemical resistance to acids, alkalis, and salts, plus water absorption close to zero, which makes it Europe's highest-volume plastic by production.

PA (nylon) is hard to beat on wear and sliding properties, but absorbs far more moisture than ABS or PP, 8.5% water absorption at saturation.

In our sourcing projects, that moisture absorption is exactly what causes complaints when a PA part is manufactured in a very humid climate and then installed in Central Europe. Dimensional accuracy shifts measurably, which is why we factor the manufacturing climate directly into tolerance alignment under ISO 2768 for PA parts with tight tolerances.

POM (polyoxymethylene, commonly known under the brand name Delrin) offers the highest stiffness and lowest sliding friction of the materials compared here, making it the standard choice for precision gears and snap-fit connections. PC (polycarbonate) is practically unbreakable when unnotched and remains transparent, but it's sensitive to notches and sharp transitions and additionally needs UV stabilization for outdoor use.

What Role Does Material Choice Play in Cost and Supplier Selection?

The choice of plastic affects more than the material price. It shapes the entire calculation, since tooling cost, injection-molding cycle times, and reject rates all vary meaningfully by material. A PA part often needs additional drying steps before processing because of its moisture sensitivity, adding time and cost to production even when the raw material price is lower than PC's.

Anyone sourcing plastic parts from the Far East should factor these follow-on costs into the total cost of ownership rather than comparing only the quoted price per piece. The same logic applies to choosing between metal and plastic altogether: a part made from stainless steel or another steel grade can cost more upfront but save on maintenance or service life depending on the application.

Frequently Asked Questions About Plastic Types

What Does ABS Stand For as a Plastic?

As a plastic, ABS stands for Acrylonitrile Butadiene Styrene, a copolymer of three monomers that gets its properties from the mix ratio of hardness, impact strength, and surface gloss. Not to be confused with the anti-lock braking system that shares the same abbreviation.

Is ABS Food-Safe?

Not as a blanket rule. Only specifically certified, food-grade ABS types that pass migration testing for food contact are approved for that use. Standard ABS from technical applications like housings or automotive parts generally doesn't meet those requirements. PP or PE are typically used for food packaging. Approval for food-contact plastics is harmonized EU-wide under Regulation (EU) No 10/2011, as Germany's Federal Institute for Risk Assessment (BfR) explains.

Which Plastic Is Best Suited for Outdoor Use?

The most weather-resistant options are typically PMMA, UV-stabilized polycarbonate, and carbon-black-pigmented HDPE. Standard ABS, PA, and POM are only conditionally suited for permanent outdoor use and lose surface quality or toughness without additional stabilization.

Which Plastic Type Is the Most Durable?

That depends on the criterion. PC leads on unnotched impact strength, but its toughness drops sharply with notches or sharp edges. PP leads on notched impact strength, POM on wear and sliding behavior, and PP also leads on chemical resistance. There's no single ranking that holds across every property at once.

Which Plastic Types Are Suitable for Welding?

Thermoplastics like ABS, PP, and PC can generally be welded, since they melt when heated. Thermosets and elastomers can't be welded, since they decompose under heat instead of melting.

Conclusion: Choose Plastic Types Deliberately for the Application

ABS covers a wide range of technical applications reliably and cost-effectively, but it's only one of several sound options. Anyone who specifies just "plastic" during sourcing hands the supplier a decision that should really be made based on actual load conditions, the climate at the point of use, and total cost.

Line Up supports you in selecting the right plastic for your part and finding the right manufacturing partner in the Far East. 👉 Schedule a no-obligation consultation.