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Polycarbonate Comparisons: PC vs Acrylic, ABS & PETG

When polycarbonate is on the shortlist, the decision usually comes down to one of three alternatives: acrylic (PMMA) for optical clarity applications, ABS for opaque enclosures and thermoformed parts, or PETG for food-contact or chemical-exposure scenarios. Each comparison has a different decision axis — this index summarizes the key trade-offs and links to dedicated versus pages for detailed analysis.

At a glance:

  • PC vs. Acrylic: PC wins on impact and temperature; acrylic wins on clarity, scratch resistance, and cost
  • PC vs. ABS: PC wins on transparency and temperature; ABS wins on chemical resistance and paintability
  • PC vs. PETG: PC wins on impact and temperature; PETG wins on chemical resistance and BPA-free status
  • All three alternatives cost less than general-purpose polycarbonate on a per-pound basis
  • For impact-critical or high-temperature transparent applications, polycarbonate has no peer in the commodity price range

Polycarbonate vs. Acrylic (PMMA / Plexiglas)

This is the most frequent comparison in transparent plastics. Acrylic and polycarbonate both serve glazing, display, and machine-guard markets, but they are optimized for different failure modes.

When to Choose Polycarbonate Over Acrylic

  • Machine guards and safety glazing where impact from tool ejecta or objects is possible
  • Applications below -40°F where acrylic becomes brittle
  • Any installation requiring UL 94 V-2 or better flame performance
  • Thermoforming at elevated draw ratios where acrylic would crack

When to Choose Acrylic Over Polycarbonate

  • Premium optical displays where 92% transmission and no yellowing over 10+ years are required
  • Outdoor signage where UV stability without UV-grade premium pricing matters (cast acrylic doesn't yellow)
  • Laser cutting applications (acrylic laser-cuts to polished optical edges; PC does not)
  • Cost-driven indoor glazing with no significant impact risk

The full head-to-head analysis, including edge-finishing, laser behavior, and cost models, is at acrylic vs. polycarbonate.

Polycarbonate vs. ABS

ABS (acrylonitrile-butadiene-styrene) competes with polycarbonate primarily in enclosure and housing applications. ABS is opaque, lower-cost, and easier to paint and bond with standard adhesives. It is not a transparent material.

When to Choose Polycarbonate Over ABS

  • Any application requiring optical transparency or translucency
  • Higher service temperature or thermal stability requirements
  • Better impact performance (though ABS is not brittle — 6 ft-lb/in is still above acrylic)

When to Choose ABS Over Polycarbonate

  • Opaque enclosures and housings where appearance (paintability) matters
  • Chemical environments involving aromatic solvents that attack PC
  • Cost-driven structural thermoformed parts without optical requirements
  • Applications requiring easy ultrasonic welding and solvent bonding with standard adhesives

For detailed information on ABS properties and applications, see the ABS material hub.

Polycarbonate vs. PETG

PETG (glycol-modified polyethylene terephthalate) occupies a middle ground: clearer than ABS, tougher than acrylic, BPA-free, and with better chemical resistance than polycarbonate. It has emerged as the preferred transparent plastic in food-contact and medical applications where BPA content eliminates PC from consideration.

When to Choose Polycarbonate Over PETG

  • Impact resistance is the selection driver (PC is 10× tougher by Izod)
  • Service temperature above 140°F — PETG softens significantly above this threshold
  • UL 94 flame rating is required (PETG is HB)

When to Choose PETG Over Polycarbonate

  • Food or beverage direct contact where BPA-free status is required or preferred
  • Chemical environments where PETG's broad chemical resistance matters
  • Applications where the lower forming temperature reduces energy costs and processing time
  • Retail and display applications where cost and clarity are priorities over impact

For the full PETG profile, see the PETG and PET material hub.

Multi-Way Comparison: Transparent Engineering Plastics

Making the Selection

Start with the failure mode that is unacceptable in your application:

  1. Must not shatter or break → Polycarbonate (PC is the only option at this impact level in transparent plastics)
  2. Must be optically excellent outdoors for 10+ years without yellowing → Cast acrylic
  3. Must be BPA-free for direct food or beverage contact → PETG or PP
  4. Must be opaque, paintable, and low-cost → ABS
  5. Must resist ketones, aromatics, or strong chemicals → PETG or ABS; not PC or acrylic

For in-depth property data on polycarbonate before making your selection, see the polycarbonate properties page. For grade-specific details on Lexan, Makrolon, and Tuffak, see the grades guide.

More related guides

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Frequently asked questions — Polycarbonate FAQ