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Glycol-modified polyethylene terephthalate

PETG for Functional Parts: Tough, Chemical-Resistant, Easy to Print

Tougher than PLA, good chemical resistance, heat limit of roughly 65–75 °C.

PETG is the general-purpose engineering plastic of FDM printing. It's tougher and more ductile than PLA, bonds well between layers, shrugs off water and many everyday chemicals, and still prints without an enclosure. For covers, guards, brackets, enclosures and fluid-adjacent parts used indoors, it is our usual starting point.

It is not a high-temperature material. Published heat-deflection temperatures for common PETG grades sit at roughly 65–75 °C at low load — a real step up from PLA, but marginal for a dashboard in a Texas summer and not enough for parts that touch a warm motor or heater. It is also less stiff than PLA: a PETG part flexes a little where a PLA part would stay rigid and then snap.

We also print carbon-fiber PETG, which is stiffer, matte and less stringy. It's a good pick when you want PETG's chemical resistance with less flex.

PETG in Texas heat

In a closed car in summer

Marginal

Outdoors, year-round

Shade or short-term

PETG survives a warm warehouse and most indoor plant conditions, but a closed car or a dark outdoor enclosure in August can push past its limit. For anything outdoors or in a vehicle, ASA is the safer call.

Where PETG works

  • Machine guards, covers and access panels
  • Electronics and sensor enclosures used indoors
  • Brackets and mounts that benefit from a little give
  • Parts that see water, coolant splash or cleaning chemicals
  • Cable management, clips and chutes
  • Production-floor organisers, bins and kitting trays

Where to use something else

  • Sustained temperatures above about 60 °C
  • Dashboards and closed vehicles in summer
  • Parts that must be very stiff or hold tight sliding fits
  • Years of direct sun — ASA ages better

Grades we print

Carbon-fiber PETG

Stiffer and matte, keeps PETG's chemical resistance.

Designing parts in PETG

  • PETG bends before it breaks — good for clips and covers, less good for precision locating features.
  • It strings more than PLA, so very fine features and small holes may need cleanup or a small design allowance.
  • Food-contact use needs more than the right raw resin: layer lines and colourants matter. Ask before assuming a printed part is food-safe.

PETG questions

PLA or PETG — which is stronger?

It depends what you mean by strong. PLA is stiffer and often shows higher tensile strength on a datasheet; PETG is tougher — it bends before it breaks and handles impact and repeated flexing better. For functional parts that get handled, bumped or clipped together, PETG usually wins. For a part that has to stay rigid at room temperature, PLA can be the better choice.

Can PETG be used outdoors?

In shade or for a season, yes. For years in Texas sun, ASA holds its colour and toughness better and has a heat limit roughly 20 °C higher.

Is PETG food-safe?

Some PETG resins are food-contact grades, but a printed part has layer lines that can trap bacteria, and colourants and printer components matter too. We don't describe printed parts as food-safe; tell us the application and we'll talk through the options honestly.

What temperature can PETG handle?

Common grades are published at roughly 65–75 °C heat-deflection under light load. For a part that carries load, plan on about 60 °C as a practical ceiling.

Compare with

  • PLA — Stiff, accurate and the cheapest to print — but it softens at roughly 50–60 °C.
  • ASA — UV-stable and good to roughly 85–100 °C — the default for parts that live outside.
  • Nylon & Carbon-Fiber Nylon — Our toughest, stiffest FDM materials — carbon-fiber grades are commonly rated 150 °C or more at low load.
  • PLA vs PETG vs ASA vs Nylon

Check your part

Need a part in PETG — or not sure it's the right one?

Send your file and tell us where the part will live. A person quotes every job, usually within one business day, with a material recommendation if a different one would serve you better.

Get a Quote

Heat figures are typical published heat-deflection ranges for common filament grades at low load (0.45 MPa), not measurements of our parts. Real values vary with brand, colour, print orientation, part design and — for nylon — moisture. If a number matters to your application, tell us and we'll talk through margin and testing.