PC/PET GF20
Reinforced grade
GF20 = 20 % glass-fiber reinforced
Balanced structural grade for load-bearing brackets and covers needing warp control.
Values for the GF20 condition
Other PC/PET grades and fills
PC/PET is listed in 8 conditions; see the grade overview at PC/PET.
Compare all 8 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
High-impact / super-tough impact-modified grade | Pick when ductile failure is required down to −30/−40 °C, e.g. bumper fascia and energy absorbers. | 45 | 47 | 160 | 64 HRM |
FR V-0 | For electrical enclosures, chargers and appliance parts requiring UL 94 V-0 at 1.5 mm. | 50 | 52 | 70 | 74 HRM |
PCR / recycled-content grade | Sustainability-driven parts where 25–60 % post-consumer content is specified and colour is dark. | 50 | 52 | 90 | 70 HRM |
Mineral / talc filled grade | Choose for isotropic shrinkage, low warpage and Class-A paintable exterior panels. | 54 | 55 | 30 | 80 HRM |
Heat-stabilized / high-heat grade | For on-line painting and e-coat ovens or under-hood parts with elevated bake temperatures. | 56 | 57 | 90 | 76 HRM |
10 % glass-fiber reinforced | Modest stiffness and dimensional-stability boost while keeping useful ductility. | — | 75 | 8 | — |
GF20This page 20 % glass-fiber reinforced | Balanced structural grade for load-bearing brackets and covers needing warp control. | — | 95 | 5 | — |
30 % glass-fiber reinforced | Maximum stiffness/heat resistance of the family; accept brittleness and fiber read-through. | — | 115 | 3.5 | — |
What is PC/PET GF20?
PC/PET GF20 is PC/PET in the GF20 grade — balanced structural grade for load-bearing brackets and covers needing warp control. PC/PET GF20 has a yield strength of 53 MPa (7.69 ksi) and a tensile strength of 95 MPa (13.8 ksi) — stronger than 59% of polymer grades. Elongation at break is 5% and the elastic modulus is 5.2 GPa (0.754 Msi). PC/PET GF20 has a density of 1.36 g/cm³ (0.0491 lb/in³), heavier than 75% of polymer grades. Its glass-transition temperature is 140°C (284 °F).
Advantages
- Stiff — 5.2 GPa (0.754 Msi), better than 88% of polymer grades
- Low, predictable mold shrinkage — 0.35%, better than 86% of polymer grades
Limitations
- Heavy — 1.36 g/cm³ (0.0491 lb/in³), worse than 75% of polymer grades
PC/PET GF20 properties
Typical room-temperature values for PC/PET GF20; 11 are specific to this condition. Other listed values are PC/PET reference data and may not represent this condition. Bars are the position among polymer grades.
Physical5
PC/PET GF20 has a density of 1.36 g/cm³ (0.0491 lb/in³), heavier than 75% of polymer grades. Its glass-transition temperature is 140°C (284 °F).
Mechanical11
PC/PET GF20 has a yield strength of 53 MPa (7.69 ksi) and a tensile strength of 95 MPa (13.8 ksi) — stronger than 59% of polymer grades. Elongation at break is 5% and the elastic modulus is 5.2 GPa (0.754 Msi).
Thermal11
PC/PET GF20 is rated for continuous service to 100°C (212 °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 35 µm/m·K (19.4 µin/in·°F).
Electrical7
PC/PET GF20 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 & Environmental2
UV resistance is fair.
Sustainability4
Producing a kilogram of PC/PET GF20 takes about 105 MJ of energy and emits 5.5 kg of CO₂ — more than 54% of polymer grades. Typical recycled content is 20%.
Manufacturability7
PC/PET GF20's machinability is fair (50/100, worse than 73% of polymer grades); weldability very good (70/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with PC/PET GF20
Is PC/PET easy to machine?
Machines like PC but with less gumming; use sharp positive-rake tools, high speed and low feed with air cooling, and avoid coolants containing esters or amines.
Can PC/PET be welded?
Excellent ultrasonic, vibration and hot-plate welding; solvent bonding is limited — use polyurethane or epoxy adhesives instead.
Can PC/PET be formed, bent or molded?
Injection mold at 250–285 °C melt / 55–95 °C tool after drying 3–4 h at 100–110 °C to <0.02 % moisture; overheating or wet feed causes hydrolysis, splay and severe property loss.
What surface finishes work on PC/PET?
Readily painted and e-coated (a key reason for the alloy); textures, vacuum metallizing and pad printing are fine, but avoid aggressive solvent primers on unpainted stressed parts.
PC/PET 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 |
|---|---|---|
| bisphenol-A polycarbonate (PC)continuous amorphous phase | 45 – 70 | 60 |
| poly(ethylene terephthalate) (PET)semi-crystalline phase giving chemical resistance | 20 – 45 | 30 |
| core-shell impact modifier (MBS/acrylic) | 3 – 12 | 7 |
| transesterification inhibitor / stabilizphosphite-type, critical for phase stability | 0.2 – 1.5 | 0.8 |
| glass fiber or mineral filleronly in reinforced variants | 0 – 30 | 0 |
PC/PET GF20 — frequently asked
What is PC/PET GF20 used for?
PC/PET GF20 is typically used for automotive trim, cosmetic housings, appliance parts and chemical-exposed components. In short: harder surface than PC; good paint and e-coat adhesion; chemically tougher than PC.
What is the yield strength of PC/PET GF20?
PC/PET GF20 has a typical yield strength of 53 MPa (7.69 ksi) and a tensile strength of 95 MPa (13.8 ksi) — stronger than 59% of polymer grades. Strength varies by condition: see the 8 listed tempers.
Is PC/PET GF20 easy to machine?
Reasonably — machinability is rated fair (50/100, worse than 73% of polymer grades). Machines like PC but with less gumming; use sharp positive-rake tools, high speed and low feed with air cooling, and avoid coolants containing esters or amines.
Can PC/PET GF20 be welded?
Yes — weldability is rated very good (70/100). Excellent ultrasonic, vibration and hot-plate welding; solvent bonding is limited — use polyurethane or epoxy adhesives instead.
What surface finishes work on PC/PET GF20?
Readily painted and e-coated (a key reason for the alloy); textures, vacuum metallizing and pad printing are fine, but avoid aggressive solvent primers on unpainted stressed parts.
Can PC/PET GF20 be formed, bent or molded?
Injection mold at 250–285 °C melt / 55–95 °C tool after drying 3–4 h at 100–110 °C to <0.02 % moisture; overheating or wet feed causes hydrolysis, splay and severe property loss.
What is the maximum service temperature of PC/PET GF20?
PC/PET GF20 is rated for continuous use to about 100°C (212 °F), and briefly to 130°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- Xenoy PC/PET resin family datasheets — SABIC Specialties (2023)
- Makroblend PC/polyester blend datasheets — Covestro (2022)
- CAMPUS plastics database, ISO 10350 single-point data for PC+PET — CWFG/CAMPUS (2024)
- Engineered Materials Handbook Vol. 2: Engineering Plastics — ASM International (1988)
- ISO 7391 Plastics — Polycarbonate moulding and extrusion materials — ISO (2006)
- ASTM D256 / D638 / D790 / D648 test methods — ASTM International (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.