PTT GF30-FR
Reinforced grade
also Sorona, Corterra
GF30-FR = gF30 + flame retardant
Structural FR grade for connectors, relay bases and breaker parts requiring V-0 plus high HDT.
Values for the GF30-FR condition
Other PTT grades and fills
PTT is listed in 9 conditions; see the grade overview at PTT.
Compare all 9 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
Impact-modified (toughened) PTT | Elastomer-toughened compound for snap-fits, sporting goods and cold-impact parts where ductility beats stiffness. | 40 | 44 | 150 | 68 Shore D |
Flame-retardant, unfilled | Halogen-containing or halogen-free FR compound for electrical enclosures needing V-0 at 1.5 mm. | 50 | 52 | 8 | 79 Shore D |
Mineral (talc) filled, 20–30 % | Choose when low warpage, isotropic shrinkage and a smooth painted surface matter more than peak strength. | 52 | 52 | 4 | 82 Shore D |
Heat-stabilized | Antioxidant-boosted compound for long-term thermal ageing (e.g. 1000 h+ at 120–140 °C) in automotive electrical parts. | 57 | 60 | 20 | 78 Shore D |
UNFDefault Unfilled / Natural injection-molding resin | General-purpose PTT for tough, glossy, dimensionally stable parts where service temperature stays below ~90 °C. | — | 62 | 25 | — |
15 % glass-fiber reinforced | Entry-level stiffening with much higher heat distortion temperature while keeping reasonable toughness and surface appearance. | — | 100 | 3.5 | — |
GF30-FRThis page GF30 + flame retardant | Structural FR grade for connectors, relay bases and breaker parts requiring V-0 plus high HDT. | — | 120 | 2 | 88 Shore D |
30 % glass-fiber reinforced | Workhorse structural grade: HDT above 200 °C, high stiffness and low shrinkage for connectors, housings and under-hood parts. | — | 138 | 2.5 | — |
45 % glass-fiber reinforced | Maximum stiffness/creep resistance PTT for metal-replacement brackets and load-bearing electrical parts. | — | 165 | 2 | — |
What is PTT GF30-FR?
PTT GF30-FR is PTT in the GF30-FR grade — structural FR grade for connectors, relay bases and breaker parts requiring V-0 plus high HDT. PTT GF30-FR has a yield strength of 58 MPa (8.41 ksi) and a tensile strength of 120 MPa (17.4 ksi) — stronger than 66% of polymer grades. Elongation at break is 2% and the elastic modulus is 9 GPa (1.31 Msi). PTT GF30-FR has a density of 1.68 g/cm³ (0.0607 lb/in³), heavier than 94% of polymer grades. Its glass-transition temperature is 50°C (122 °F). UNF is the default condition FabDigit quotes; GF30-FR is available on request or by drawing note.
Advantages
- Stiff — 9 GPa (1.31 Msi), better than 93% of polymer grades
- Conducts heat well — 0.32 W/m·K (0.185 BTU/hr·ft·°F), better than 88% of polymer grades
- Low, predictable mold shrinkage — 0.35%, better than 86% of polymer grades
- Low embodied carbon — 3 kg CO₂/kg, better than 83% of polymer grades
Limitations
- Limited ductility — 2%, worse than 95% of polymer grades
- Heavy — 1.68 g/cm³ (0.0607 lb/in³), worse than 94% of polymer grades
- Limited formability — 8/100, worse than 91% of polymer grades
- Difficult to machine — 38/100, worse than 83% of polymer grades
PTT GF30-FR properties
Typical room-temperature values for PTT GF30-FR; 27 are specific to this condition. Other listed values are PTT reference data and may not represent this condition. Bars are the position among polymer grades.
Physical6
PTT GF30-FR has a density of 1.68 g/cm³ (0.0607 lb/in³), heavier than 94% of polymer grades. Its glass-transition temperature is 50°C (122 °F).
Mechanical16
PTT GF30-FR has a yield strength of 58 MPa (8.41 ksi) and a tensile strength of 120 MPa (17.4 ksi) — stronger than 66% of polymer grades. Elongation at break is 2% and the elastic modulus is 9 GPa (1.31 Msi).
Thermal11
PTT GF30-FR is rated for continuous service to 130°C (266 °F). It conducts heat at 0.32 W/m·K (0.185 BTU/hr·ft·°F), better than 88% of polymer grades. Thermal expansion is 80 µm/m·K (44.4 µin/in·°F).
Electrical7
PTT GF30-FR is an electrical insulator with a dielectric strength of 22 kV/mm (558.8 V/mil) and a resistivity of 1×10¹⁴ Ω·m.
Chemical & Environmental3
Corrosion resistance is very good (78/100), worse than 61% of polymer grades. UV resistance is fair.
Sustainability4
Producing a kilogram of PTT GF30-FR takes about 70 MJ of energy and emits 3 kg of CO₂ — less than 93% of polymer grades. Typical recycled content is 0%.
Manufacturability8
PTT GF30-FR's machinability is fair (38/100, worse than 83% of polymer grades); weldability fair (35/100); formability not recommended (8/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with PTT GF30-FR
Is PTT easy to machine?
Machines like PBT/PET — sharp positive-rake tools, high speed, low feed and air cooling; glass-filled grades are abrasive and need carbide or PCD.
Can PTT be welded?
Joins well by ultrasonic, vibration, hot-plate and laser welding; solvent bonding is poor, so use epoxy or cyanoacrylate for adhesive joints.
Can PTT be formed, bent or molded?
Dry to <0.02 % moisture (120–130 °C, 3–4 h) before molding; melt 240–265 °C, mold 40–90 °C (higher for filled grades), fast crystallization gives short cycles and low warpage.
What surface finishes work on PTT?
Takes high-gloss mold finishes and disperse dyes readily; paint/print after flame or plasma treatment, and avoid hot alkaline cleaning which hydrolyzes the surface.
PTT 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 |
|---|---|---|
| 1,3-propanediol (PDO)diol residue in repeat unit; bio-PDO from corn sugar in Sorona | 34 – 39 | 37 |
| Ti/Sn polycondensation catalysttitanate or tin catalyst residue | 0 – 0.02 | 0.01 |
| heat/UV stabilizer packagegrade dependent | 0 – 1 | 0.3 |
| glass fiber0 for the default unfilled grade; 15/30/45 % in reinforced variants | 0 – 45 | 0 |
| terephthalic acid (PTA/DMT) residuediacid residue, ~63 wt% of repeat unit C11H10O4 | balance | — |
PTT GF30-FR — frequently asked
What is PTT GF30-FR used for?
PTT GF30-FR is typically used for carpet and textile fiber, apparel fabric with stretch recovery, engineering resin for connectors and automotive interior trim fiber. In short: elastic-recovery polyester; between PET and PBT; fast cycles, low warpage.
What is the yield strength of PTT GF30-FR?
PTT GF30-FR has a typical yield strength of 58 MPa (8.41 ksi) and a tensile strength of 120 MPa (17.4 ksi) — stronger than 66% of polymer grades. Strength varies by condition: see the 9 listed tempers.
Is PTT GF30-FR easy to machine?
Not especially — machinability is rated fair (38/100, worse than 83% of polymer grades). Machines like PBT/PET — sharp positive-rake tools, high speed, low feed and air cooling; glass-filled grades are abrasive and need carbide or PCD.
Can PTT GF30-FR be welded?
With care — weldability is rated fair (35/100). Joins well by ultrasonic, vibration, hot-plate and laser welding; solvent bonding is poor, so use epoxy or cyanoacrylate for adhesive joints.
What surface finishes work on PTT GF30-FR?
Takes high-gloss mold finishes and disperse dyes readily; paint/print after flame or plasma treatment, and avoid hot alkaline cleaning which hydrolyzes the surface.
Can PTT GF30-FR be formed, bent or molded?
Dry to <0.02 % moisture (120–130 °C, 3–4 h) before molding; melt 240–265 °C, mold 40–90 °C (higher for filled grades), fast crystallization gives short cycles and low warpage.
What is the maximum service temperature of PTT GF30-FR?
PTT GF30-FR is rated for continuous use to about 130°C (266 °F), and briefly to 140°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between PTT UNF and PTT IM?
UNF is the default condition — general-purpose PTT for tough, glossy, dimensionally stable parts where service temperature stays below ~90 °C. IM: elastomer-toughened compound for snap-fits, sporting goods and cold-impact parts where ductility beats stiffness. Yield strength is 58 MPa in UNF versus 40 MPa in IM.
Sources
- Sorona EP thermoplastic polymer product & processing guides — DuPont / Covation Biomaterials (2022)
- Corterra PTT polymer technical bulletins — Shell Chemicals / Zhejiang PTT producers (2005)
- Handbook of Thermoplastic Polyesters (PTT chapters) — Wiley-VCH (S. Fakirov, ed.) (2002)
- CAMPUS / UL Prospector polyester (PTT) datasheets — CWFG / UL Solutions (2024)
- ISO 527 / ISO 178 / ISO 75 / ASTM D256 test methods for thermoplastics — ISO / ASTM (2019)
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.