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PETG Comparisons — vs Acrylic, Polycarbonate & PET

PETG competes directly with acrylic and polycarbonate in the clear plastic market, and is frequently confused with bearing-grade PET (Ertalyte). Each comparison resolves differently depending on the application: PETG wins for impact-critical fabrication and thermoforming; acrylic wins for scratch resistance and outdoor UV durability; polycarbonate wins for high-impact and high-temperature applications.

At a glance:

  • PETG vs acrylic: PETG is tougher, less brittle, easier to thermoform; acrylic is clearer and scratch-resistant
  • PETG vs polycarbonate: PC is stronger and withstands more heat; PETG is cheaper, bonds easier, resists more chemicals
  • PETG ≠ PET: PET-P (Ertalyte) is a semi-crystalline bearing material; PETG is amorphous and clear — not interchangeable

PETG vs Acrylic (PMMA)

The most common comparison in the display and fabrication market.

Choose PETG when:

  • The part will be drilled, routed, or assembled — PETG's toughness prevents cracking at holes and fasteners that plagues acrylic
  • Thermoforming is required and lower forming temperatures are needed
  • Chemical exposure (cleaning solvents, mild acids) is present — PETG resists a wider range than acrylic
  • Impact from handling or user contact is expected

Choose acrylic when:

  • Maximum optical clarity is required (acrylic has slightly better transmission and lower haze)
  • Scratch resistance is a primary requirement (acrylic is harder, more scratch-resistant than PETG)
  • Outdoor UV exposure is prolonged — UV-stabilized acrylic outperforms PETG outdoors
  • The application is structural (acrylic is stiffer and stronger in tension)

See the full PETG vs acrylic comparison.

PETG vs Polycarbonate

Polycarbonate is the high-performance clear plastic. PETG is the cost-effective mid-range option.

Choose PETG when:

  • Cost is a factor and extreme impact is not required
  • Chemical resistance to solvents and cleaning agents is important — PC is attacked by many common solvents; PETG resists most of them
  • Scratch resistance matters — PETG scratches less readily than polycarbonate
  • Solvent bonding is preferred — PETG is far easier to solvent-cement than polycarbonate
  • Indoor use only at temperatures below 140°F

Choose polycarbonate when:

  • Impact resistance is the primary requirement (PC is 6–10× more impact resistant than PETG)
  • Higher operating temperature is needed (PC is rated to 240°F continuous vs 140°F for PETG)
  • Ballistic or blast resistance is required
  • The application is safety-critical and requires certifiable impact performance

See the full PETG vs polycarbonate comparison.

PETG vs PET (Ertalyte) — The Most Important Distinction

These are NOT alternatives — they serve completely different application domains.

Specifying PETG in place of Ertalyte for a bearing application will result in part failure. Specifying Ertalyte in a display or thermoforming application gives you an opaque part that cannot be thermoformed. The materials share a regulatory citation but are otherwise unrelated for engineering purposes.

The full technical explanation is at PET vs PETG.

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More related guides

Applications

Compare to other materials

Frequently asked questions — PETG FAQ

Other PETG Reference Guides

PETG SpecificationsPETG plastic specifications: sheet thicknesses, size tolerances, applicable standards for display and guard sheet, thermoforming characteristics, and regulatory compliance.PETG RodPETG rod stock: clear amorphous PET copolyester rod for machined spacers, display components, and optical housings. Size range, tolerances, and machining notes.Machining PETG PlasticHow to machine, rout, cut, and fabricate PETG plastic: speeds, feeds, tooling, bonding, forming, and finishing for sheet and rod. Avoid common gummy-chip problems.PETG TubePETG tube stock: clear amorphous copolyester tube for display fixtures, lighting diffusers, sight glasses, and clear enclosures. Sizes, tolerances, and availability.PETG SheetPETG sheet sizes, thicknesses, and tolerances for displays, machine guards, thermoforming, and food packaging. Stock sizes 48×96", 24×48", 0.030"–0.500" thick.PETG PropertiesPETG plastic properties datasheet: tensile strength, optical clarity, heat deflection temperature, impact resistance, chemical resistance, and thermoforming characteristics.PETG FDA Food-Grade CompliancePETG FDA food-contact compliance: 21 CFR 177.1630, food packaging suitability, EU food contact regulations, and PETG for food-zone covers, trays, and displays.PETG GradesPETG grades for sheet and rod: Eastman PETG copolyester, PCTG, UV-stabilized, tinted, and anti-static options. Grade selection guide for display, guard, and packaging use.PETG Plastic FAQCommon questions about PETG: difference from PET and acrylic, food safety, thermoforming temps, bonding, UV resistance, and whether PETG is FDA approved.PETG ApplicationsWhere PETG plastic is used: POP displays, signage, machine guards, food packaging, thermoformed trays, and medical device covers. Application selection guide.