The short answerPETG is tough, not brittle, and bonds well.

PETG is stronger than PLA in the ways that matter for functional parts. It bends before it breaks, takes impact without shattering, and holds up to moderate heat. The Prusament and Polymaker datasheets put its heat deflection at 68 to 69 °C.

Where PETG’s strength comes from

PETG is a glycol-modified polyester. The glycol lowers brittleness, so the part bends and stretches instead of snapping. That makes PETG a better pick than PLA for any part that gets handled, dropped, or loaded. It still falls short of ABS for sustained high heat.

Strength numbers

PETG strength properties

Heat deflection temp

68 to 69°C

Prusament 68, Polymaker 69, ISO 75.

Glass transition

71°C

Per Polymaker PETG TDS.

Density

1.27g/cm³

Per Prusament PETG TDS.

Impact vs PLA

Higher

Bambu Lab rates PETG above PLA for impact.

PETG compared for strength

PETG versus PLA and ABS for strength
PropertyPETGPLAABS
ToughnessHighLowHigh
BrittlenessLowHighLow
Heat resistanceMediumLowHigh
Impact resistanceHighLowMedium
Layer adhesionStrongMediumStrong
Best for strengthDurable partsDisplay modelsWarm, loaded parts
Green marks the category leader. PETG wins on low brittleness and high impact resistance.

Key takeaways

  • PETG heat deflection sits at 68 to 69 °C.
  • It is less brittle and higher impact than PLA.
  • Layer adhesion depends on a hot nozzle and dry filament.
  • For sustained high heat, ABS still beats PETG.

Frequently asked

Is PETG stronger than PLA?
Yes for practical strength. PETG is tougher, less brittle, and takes impact better. PLA is more rigid but snaps under sharp load.
How strong is PETG compared to ABS?
ABS holds up to more heat and similar impact. PETG is easier to print and close to ABS for room-temperature strength.
Why do my PETG parts split along the layers?
The nozzle is too cold or the filament is wet. Print at 240 to 260 °C and dry the PETG first.
How do I make PETG parts stronger?
Print at 240 to 260 °C for strong layer adhesion, dry the filament first, and add more perimeters. Wall count matters more than infill for strength.

For the print settings behind these numbers, read the PETG temperature guide. For the broad comparison, see PLA versus PETG. The strongest filament roundup ranks materials by strength.

Related guides

Related

More in this area

Sources & methodology

5 citations · reviewed 2026-07-09
  1. 01Prusament PETG Technical Datasheetaccessed 2026-07-06Tier 1
  2. 02Polymaker PETG Technical Data Sheetaccessed 2026-07-06Tier 1
  3. 03Bambu Lab PETG Usage Guideaccessed 2026-06-29Tier 1
  4. 043DSourced PETG Filament Guideaccessed 2026-06-29Tier 2
  5. 05All3DP PETG Comprehensive Guideaccessed 2026-06-30Tier 2
How we vetted this: every claim traces to a tiered source, Tier 1 (manufacturer, slicer, standards) first. Read the full sourcing and conflict-of-interest policy.