PETG FR (Flame-retardant PETG)
Flame-retardant grade
Pick for electrical enclosures, transit interiors and machine guards requiring V-0 at 1.5–3 mm.
Values for the FR condition
Other PETG grades and fills
PETG is listed in 6 conditions; see the grade overview at PETG.
Compare all 6 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
FDM/FFF printed PETG (XY direction, typical settings) | Use these de-rated values for FDM-printed PETG parts; expect 40–60% of molded strength in Z. | 38 | 40 | 8 | — |
Antistatic / static-dissipative PETG | Pick for electronics handling trays, guards and cleanroom fixtures needing 10^6–10^9 Ω surface resistivity. | 45 | 45 | 25 | 79 Shore D |
FRThis page Flame-retardant PETG | Pick for electrical enclosures, transit interiors and machine guards requiring V-0 at 1.5–3 mm. | 45 | 45 | 40 | 79 Shore D |
Carbon-fiber reinforced PETG | Pick for stiffer, more dimensionally stable printed parts with matte black finish; brittle and abrasive to nozzles. | — | 48 | 3 | — |
extruded PETG sheet / general-purpose grade | Pick for stock extruded sheet used in glazing, machine guards, signage and thermoforming. | 50 | 50 | 130 | 78 Shore D |
Glass-fiber reinforced PETG | Pick when stiffness, creep resistance and lower shrinkage matter more than transparency or toughness. | — | 65 | 3 | — |
What is PETG FR?
PETG FR is PETG in the FR grade — pick for electrical enclosures, transit interiors and machine guards requiring V-0 at 1.5–3 mm. PETG FR has a yield strength of 45 MPa (6.53 ksi) and a tensile strength of 45 MPa (6.53 ksi) — weaker than 58% of polymer grades. Elongation at break is 40% and the elastic modulus is 2.2 GPa (0.319 Msi). PETG FR has a density of 1.33 g/cm³ (0.048 lb/in³), heavier than 73% of polymer grades. Its glass-transition temperature is 80°C (176 °F).
Advantages
- Polishes to a fine finish — 72/100, better than 84% of polymer grades
- Low, predictable mold shrinkage — 0.4%, better than 82% of polymer grades
- Low embodied carbon — 3.2 kg CO₂/kg, better than 81% of polymer grades
- Readily welded — 72/100, better than 80% of polymer grades
Limitations
- Limited service temperature — 63°C (145 °F), worse than 85% of polymer grades
PETG FR properties
Typical room-temperature values for PETG FR; 27 are specific to this condition. Other listed values are PETG reference data and may not represent this condition. Bars are the position among polymer grades.
Physical6
PETG FR has a density of 1.33 g/cm³ (0.048 lb/in³), heavier than 73% of polymer grades. Its glass-transition temperature is 80°C (176 °F).
Mechanical12
PETG FR has a yield strength of 45 MPa (6.53 ksi) and a tensile strength of 45 MPa (6.53 ksi) — weaker than 58% of polymer grades. Elongation at break is 40% and the elastic modulus is 2.2 GPa (0.319 Msi).
Thermal11
PETG FR is rated for continuous service to 63°C (145 °F). It conducts heat at 0.21 W/m·K (0.121 BTU/hr·ft·°F), better than 55% of polymer grades. Thermal expansion is 68 µm/m·K (37.8 µin/in·°F).
Electrical6
PETG FR is an electrical insulator with a dielectric strength of 16 kV/mm (406.4 V/mil) and a resistivity of 1×10¹⁴ Ω·m.
Chemical & Environmental3
Corrosion resistance is very good (84/100), better than 58% of polymer grades. UV resistance is fair.
Sustainability4
Producing a kilogram of PETG FR takes about 84 MJ of energy and emits 3.2 kg of CO₂ — less than 81% of polymer grades. Typical recycled content is 0%.
Manufacturability7
PETG FR's machinability is good (60/100, better than 51% of polymer grades); weldability very good (72/100); formability very good (70/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with PETG FR
Is PETG easy to machine?
Machines and routes well with sharp, polished, high-rake tools and air blast; keep feeds high and coolant/mist on to avoid gumming and edge crazing, and avoid stress at drilled holes.
Can PETG be welded?
Excellent hot-plate, hot-gas, ultrasonic and RF/high-frequency welding; solvent bonds with cyclohexanone/MEK-based cements and glues well with cyanoacrylate or two-part urethane.
Can PETG be formed, bent or molded?
Thermoforms at 120–160 °C with little pre-drying and cold-bends without stress-whitening; inject at 230–260 °C melt / 10–40 °C mold, dry pellets 4 h at 65 °C to prevent hydrolytic splay.
What surface finishes work on PETG?
Takes screen/digital printing, hard-coating and vacuum metallizing; edges can be sanded and buffed (flame polishing is riskier than for acrylic), and paint/adhesive systems must be solvent-checked for crazing.
PETG chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| terephthalate (PTA/DMT) repeat unitacid component of the copolyester backbone (mol basis) | 48 – 52 | 50 |
| 1,4-cyclohexanedimethanol (CHDM) unit~30 mol% of the glycol fraction; suppresses crystallinity (amorphous) | 12 – 20 | 16 |
| additives (stabilizers, colorants, UV/FRgrade dependent; fillers listed separately per variant | 0 – 15 | 1 |
| ethylene glycol unitglycol component balance | ≥ 30 (balance) | — |
PETG FR — frequently asked
What is PETG FR used for?
PETG FR is typically used for transparent machine guards, retail displays and shelf fixtures, light-box and signage panels, food-contact parts and containers, bottles and medical device housings. In short: versatile tough plastic.
What is the yield strength of PETG FR?
PETG FR has a typical yield strength of 45 MPa (6.53 ksi) and a tensile strength of 45 MPa (6.53 ksi) — weaker than 58% of polymer grades. Strength varies by condition: see the 6 listed tempers.
Is PETG FR easy to machine?
Reasonably — machinability is rated good (60/100, better than 51% of polymer grades). Machines and routes well with sharp, polished, high-rake tools and air blast; keep feeds high and coolant/mist on to avoid gumming and edge crazing, and avoid stress at drilled holes.
Can PETG FR be welded?
Yes — weldability is rated very good (72/100). Excellent hot-plate, hot-gas, ultrasonic and RF/high-frequency welding; solvent bonds with cyclohexanone/MEK-based cements and glues well with cyanoacrylate or two-part urethane.
What surface finishes work on PETG FR?
Takes screen/digital printing, hard-coating and vacuum metallizing; edges can be sanded and buffed (flame polishing is riskier than for acrylic), and paint/adhesive systems must be solvent-checked for crazing.
Can PETG FR be formed, bent or molded?
Thermoforms at 120–160 °C with little pre-drying and cold-bends without stress-whitening; inject at 230–260 °C melt / 10–40 °C mold, dry pellets 4 h at 65 °C to prevent hydrolytic splay.
What is the maximum service temperature of PETG FR?
PETG FR is rated for continuous use to about 63°C (145 °F), and briefly to 75°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in PETG FR?
Yes — PETG FR is available for CNC machining, sheet metal, injection molding and 3D printing with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- Eastman Eastar / Spectar copolyester (PETG) product data — Eastman Chemical (2023)
- SKYGREEN PETG resin grades data sheets — SK Chemicals (2022)
- CAMPUS plastics database — PETG copolyester ISO data sets — CWFG / CAMPUS (2024)
- ISO 527-2 / ISO 178 / ISO 75 / ISO 306 test methods — ISO (2019)
- ASTM D256 / D638 / D648 / D785 test methods — ASTM (2022)
- Ensinger / Curbell semi-finished PETG sheet technical data — Ensinger, Curbell Plastics (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.