Many engineering teams struggle to weigh resin cost against long-term performance risk. A housing that cracks during a drop test, or a lens that yellows after a summer outdoors, can turn a "cheaper" material into the more expensive choice.
Notched Izod impact strength for injection-grade ABS ranges from 240 to 320 J/m, compared to 690 to 800 J/m for comparable polycarbonate grades, according to SABIC's 2022 brochure_ROA_2022_tcm1010-44376.pdf). That gap alone explains why so many OEM teams get this decision wrong.
This guide breaks the comparison down by impact and heat performance, chemical and UV exposure, electrical and optical needs, manufacturability, and total cost.
Key Takeaways
- ABS suits cost-sensitive parts needing rigidity, surface finish, and moderate impact resistance
- Polycarbonate fits high-impact, high-heat, or transparency-driven applications
- No resin wins universally; match the grade to the part's environment and service life
- Processing factors like drying, wall thickness, and gate design belong in the material decision
- PC-ABS blends can bridge the gap when a design needs traits from both resins
ABS vs. Polycarbonate: Quick Comparison
| Property | ABS (injection grade) | Polycarbonate (injection grade) |
|---|---|---|
| Notched Izod impact (ASTM D256, 23°C) | 240–320 J/m | 690–800 J/m |
| Heat deflection temp (ASTM D648, 1.82 MPa) | 80–86°C | Varies by grade; verify datasheet |
| Appearance | Opaque, broad color range | Transparent; tintable or opaque |
| Relative resin cost | Lower | Higher |
Cost
ABS generally costs less, both as raw resin and in processing, than polycarbonate. But resin pricing moves with feedstock markets. Plastics Today has tracked how benzene and butadiene cost swings put pressure on both ABS and PC pricing, which means a fixed percentage comparison doesn't hold up over time.
Price per pound matters less than whether polycarbonate's impact or heat performance prevents a costlier field failure, warranty claim, or redesign down the line. Get current quotes from your molder and resin supplier before locking in a material.
Composition and Appearance
ABS is a blend of three monomers, each contributing something different:
- Acrylonitrile: chemical resistance and hardness
- Butadiene: toughness and impact absorption
- Styrene: rigidity, surface finish, and processability
Polycarbonate, by contrast, is built on a bisphenol A backbone and is inherently transparent in its standard form, though specific grades can be tinted, translucent, or formulated opaque. ABS, meanwhile, is typically opaque but takes color and paint well across a wide range of finishes.
Impact and Mechanical Performance
Under real loading conditions, polycarbonate generally outperforms ABS for raw toughness. The grade-specific Izod data cited above quantifies that gap.
ABS isn't fragile, though. It offers a practical balance of:
- Rigidity for structural housings
- Surface hardness for scratch and wear resistance
- Enough toughness for everyday handling, drops, and assembly stress
For parts facing occasional bumps rather than repeated high-energy impacts, ABS often performs well enough without the cost premium.
Heat and Dimensional Performance
Polycarbonate typically holds up better under sustained heat. The injection-grade ABS resins referenced earlier show heat deflection temperatures in the 80–86°C range under ASTM D648 loaded conditions. Published polycarbonate HDT and glass transition values vary by grade, so confirm against a current datasheet.
Dimensional stability depends less on the resin family and more on part geometry, wall thickness uniformity, and mold design. A well-engineered ABS part can hold tighter tolerances than a poorly designed polycarbonate one.
Chemical, UV, and Surface Performance
Neither resin handles every chemical equally. Covestro's testing found that Makrolon polycarbonate resisted most industrial oils, greases, and waxes. Covestro's chemical guide also flags that standard fuels are unsuitable and acetone causes swelling. Resistance always depends on exposure time, temperature, and part stress.
Standard ABS and standard PC both need stabilization for sustained outdoor UV exposure. Scratch resistance also varies by grade in both families. Verify against the specific resin supplier's datasheet before committing to a design, not a generic material comparison chart.
What Is ABS? Use Cases for Injection Molded OEM Parts
Acrylonitrile butadiene styrene earns its spot in OEM manufacturing because it balances several properties at once: stiffness, impact resistance, a good cosmetic finish, colorability, dimensional stability, and a manageable cost per part. For high-volume programs where every one of those factors matters, ABS is often the pragmatic default.
That balance translates into real OEM outcomes:
- Economical high-volume production with shorter cycle times than many engineering resins
- Attractive housings and covers that take paint, texture, and color consistently
- Reliable fit and assembly thanks to predictable shrinkage behavior
- Resistance to everyday handling including scuffs, drops, and routine abrasion
Where ABS Falls Short
Standard ABS has real limits. It won't match polycarbonate's heat capability, it can degrade under UV exposure without stabilization, and its chemical resistance is exposure-specific rather than universal. Any of these gaps can rule out standard ABS for a given application.
ABS Grade Variations
Not all ABS is the same material in different colors. Supplier portfolios include:
- High-impact grades
- Flame-retardant grades
- UV-stabilized formulations
- Glass-filled versions for added stiffness
- Electroplatable grades for metallic finishes
Always verify grade-specific properties against the resin supplier's datasheet rather than assuming "ABS" behavior transfers across formulations.
Common ABS Applications
ABS shows up across interior automotive trim, electrical and control housings, appliance components, instrument covers, knobs, and other opaque parts where cost, finish, and moderate impact resistance are the priorities. SABIC specifically cites CYCOLAC's colorability, scratch resistance, and flow characteristics as relevant to automotive interior trim programs.
For electrical connector and control-device applications, ABS can work well when the selected grade meets insulation, flame rating, and dimensional requirements. When a molded ABS housing is part of a larger assembly, insert molding, overmolding, and welding requirements should be reviewed alongside the resin choice, not after it.
Midwest Molding runs 55 all-electric injection molding presses (50 horizontal, 5 vertical), supporting both straight injection molding and more complex builds that combine those secondary processes.
What Is Polycarbonate? Use Cases for Injection Molded OEM Parts
Polycarbonate earns its reputation as a tough engineering thermoplastic through high impact resistance, mechanical strength, elevated-temperature performance, and, in transparent grades, genuine optical clarity. For parts that have to survive shock loads or repeated stress cycles, that combination matters more than resin cost per pound.
These properties translate directly into operational benefits:
- Longer service life under repeated mechanical loading
- Reduced fracture risk in impact-prone applications
- Protection for internal electronics or sensor components
- More design freedom for demanding guards, lenses, and covers
Trade-Offs to Consider
Polycarbonate isn't a free upgrade. Key drawbacks include:
- Higher cost per pound and per cycle than many ABS grades
- Scratches more easily without a hard coat
- Poor resistance to certain solvents
- Needs careful moisture control before molding to avoid hydrolytic degradation
Polycarbonate Grade Variations
Grade selection matters as much here as it does with ABS:
- Transparent optical-grade resins for lenses
- Colored or tinted formulations
- Flame-retardant grades for electrical enclosures
- UV-stabilized versions for outdoor exposure
- Glass-filled grades for added stiffness
General polycarbonate properties and specific grade performance are not interchangeable claims.
Common Polycarbonate Applications
Transparent covers, safety guards, sensor windows, automotive lighting components, and high-impact housings are classic polycarbonate territory. SABIC's LEXAN resin page lists automotive headlamp housings and electrical/electronic connectors among its common applications.
Sensor and control-device designs benefit from polycarbonate when impact resistance, dimensional retention under temperature swings, or visibility into the housing's interior are design requirements.
As with ABS, insert molding, overmolding, and welding can affect optical clarity, introduce stress near gate locations, and change weld-line strength. Final-part validation must account for all of it, not just the base resin's published properties.
ABS vs. Polycarbonate: What Is Better for an OEM Part?
Start with the real decision principle: pick the material that satisfies the most critical performance requirement at the lowest acceptable total cost. Don't choose by resin price alone, and don't choose by a generic "which plastic is stronger" ranking.
Choose ABS when the part is:
- Opaque and cost-sensitive
- Exposed to moderate temperatures and impacts
- Dependent on cosmetic finish, rigidity, or colorability
Choose polycarbonate when the part needs:
- High impact toughness under repeated or severe loading
- Elevated-temperature performance
- Transparency or optical clarity
- Protection in a demanding outdoor or mechanical environment
Manufacturability Considerations
Injection molding behavior differs meaningfully between the two resins. Review these DFM factors before finalizing material selection:
- Drying requirements: polycarbonate is more moisture-sensitive and needs tighter drying control before molding
- Melt and mold temperatures: PC typically runs hotter, affecting cycle time and tooling design
- Wall uniformity and flow length: both resins are sensitive to thick-to-thin transitions, but warpage shows up differently
- Gate location and weld lines: critical for optical PC parts where weld lines are visually and structurally significant
- Shrinkage and ejection: affects tolerance stack-up and draft angle requirements
Validation Checklist
Before releasing either resin to production, validate against:
- Mechanical loads and expected service life
- Temperature cycling across the part's operating range
- Chemical exposure matching actual field conditions
- UV or weathering exposure, if applicable
- Flammability classification per UL 94, where required
- Electrical insulation requirements for connector or housing parts
- Dimensional inspection and assembly fit
PC-ABS Blends as a Middle Ground
When a design needs traits from both materials, PC-ABS blends are worth evaluating. These combine heat resistance and rigidity from PC with the cost and processability of ABS.
Blend performance still has to be confirmed grade by grade, though. Chemical compatibility, heat resistance, and processing behavior aren't guaranteed just because the blend name includes both resins.
A Real-World Example
Automotive supplier Yanfeng needed to integrate dynamic lighting into a production door panel, combining an optical component with a structural one in a single assembly.
According to Covestro's Yanfeng case study, the team used transparent Makrolon PC for the optical element and Bayblend PC/ABS for the structural component. Both were molded together in a 3K injection-molding tool with in-mold coating. The part left the mold ready for assembly, and the design earned a 2025 SPE Automotive Award.
That approach illustrates the broader point: material selection isn't always "ABS or PC." Sometimes it's both, paired deliberately to each component's job.
Manufacturers of automotive, transportation, electronics, appliance, or consumer goods components can request guidance on molding processes and parameters from Midwest Molding. That conversation can cover molding, insert molding, overmolding, assembly, and welding requirements together rather than as separate decisions.
Conclusion
ABS remains the efficient choice for general-purpose, cosmetic, cost-sensitive molded parts. Polycarbonate earns its higher price tag on high-impact, high-temperature, or transparency-driven applications.
The right call depends on part geometry, service environment, qualification requirements, production economics, and grade-specific data, not a blanket rule for either material.
Midwest Molding supports injection molding, assembly, and welding for demanding manufacturing applications across automotive, electronics, appliance, and consumer goods programs. The company runs 55 all-electric injection molding presses across a broad range of press sizes at its 120,000-square-foot facility in Bartlett, Illinois, and holds IATF 16949:2016 certification for automotive quality management.
OEM teams weighing ABS against polycarbonate for an upcoming program can discuss molding processes, parameters, and part re-formulation opportunities directly with Midwest Molding's engineering team.
Frequently Asked Questions
Which is better, polycarbonate or ABS?
Polycarbonate is usually stronger for high-impact and high-heat applications, while ABS often wins on cost, finish, and rigidity for general-purpose molded parts. The specific application determines the better choice.
Which is better for a suitcase, ABS or polycarbonate?
Polycarbonate is commonly selected for suitcase shells because it handles repeated impact and flexes back into shape rather than cracking. That consumer example doesn't replace grade-specific evaluation for OEM industrial parts, though.
Is polycarbonate stronger than ABS plastic?
It depends on which "strength" you mean. Polycarbonate generally wins on impact strength and heat resistance, but ABS can offer comparable or better surface hardness and stiffness depending on the specific grades compared.
Is polycarbonate basically plastic?
Yes, polycarbonate is an engineering thermoplastic, not a commodity plastic like polystyrene or polyethylene. Its higher impact resistance, heat performance, and use in demanding injection molded applications set it apart from everyday commodity resins.
