Benchmark · 4 materials
3021 vs G11 vs G7 vs G5
Side-by-side benchmark of 4 composite grades.
PropertiesHow to read this table
- The best value in each row is in bold.
- Values are typical room-temperature figures for the default condition (temper / grade as listed).
- Relative cost is a market tier, not a price — it moves with region and volume.
- Confirm against the certified mill / resin datasheet before design release.
How to read this table
- The best value in each row is in bold.
- Values are typical room-temperature figures for the default condition (temper / grade as listed).
- Relative cost is a market tier, not a price — it moves with region and volume.
- Confirm against the certified mill / resin datasheet before design release.
| Property | 3021 | G11 | G7 | G5 |
|---|---|---|---|---|
| Yield strengthMPaksi | — | 260 MPa38 ksi | 110 MPa16 ksi | 90 MPa13 ksi |
| Tensile strengthMPaksi | — | 340 MPa49 ksi | 100 MPa15 ksi | 100 MPa15 ksi |
| Specific strengthMPa·cm³/g | — | 141 | 65 | 63 |
| Densityg/cm³lb/in³ | — | 1.85 g/cm³0.067 lb/in³ | 1.7 g/cm³0.061 lb/in³ | 1.42 g/cm³0.051 lb/in³ |
| Max service temp°C°F | — | 180 °C356 °F | 220 °C428 °F | 120 °C248 °F |
| Min service temp°C°F | — | -50 °C-58 °F | -50 °C-58 °F | -40 °C-40 °F |
| Electrical conductivity% IACS | — | < 0.001 % IACSinsulator | < 0.001 % IACSinsulator | < 0.001 % IACSinsulator |
| Machinability/100 | — | Very good75 / 100 | Very good75 / 100 | Very good75 / 100 |
| Weldability/100 | — | Not recommended5 / 100 | Not recommended5 / 100 | Not recommended5 / 100 |
| Formability/100 | — | Not recommended5 / 100 | Not recommended5 / 100 | Not recommended5 / 100 |
| Relative cost | — | $$$ Premium | $$$ Premium | $$$ Premium |
| Processes | CNC, Sheet | CNC, Sheet | CNC, Sheet |
Where each grade sits
One track per property; coloured markers are the compared grades, the shaded band is the composite family 10th–90th percentile and the tick its median.
Yield strength—
81 MPa12 ksifamily median 175 MPa25 ksi280 MPa41 ksi
Tensile strength—
96 MPa14 ksifamily median 195 MPa28 ksi574 MPa83 ksi
Density—
1.34 g/cm³0.048 lb/in³family median 1.5 g/cm³0.054 lb/in³1.85 g/cm³0.067 lb/in³
Hardness (HB equiv.)—
65 HBfamily median 170 HB481 HB
Max service temp—
120 °C248 °Ffamily median 130 °C266 °F200 °C392 °F
Electrical conductivity—
< 0.001 % IACSfamily median < 0.001 % IACS< 0.001 % IACS
Machinability—
22 / 100family median 75 / 10075 / 100
Relative cost—
60family median 6060
3021G11G7G5
Strength versus weight
Manufacturing and finishing
| Capability | 3021 | G11 | G7 | G5 |
|---|---|---|---|---|
| CNC machining | — | Yes | Yes | Yes |
| Sheet metal | — | Yes | Yes | Yes |
| Default condition | — | Epoxy Matrix | Silicone Matrix | Melamine Matrix |
| Min. machined wall | — | — | — | — |
| Best machined surface | — | — | — | — |
| Heat treatments | — | — | — | — |
| Chemical Etching | — | Yes | Yes | Yes |
| Dot Peen Marking | — | Yes | Yes | Yes |
| Electro-chemical Etching | — | Yes | Yes | Yes |
| Embossing / Debossing | — | Yes | Yes | Yes |
| Ink Stamping | — | Yes | Yes | Yes |
| Laser Marking | — | Yes | Yes | Yes |
| Mechanical Engraving | — | Yes | Yes | Yes |
| Painting | — | Yes | Yes | Yes |
| Vibro Engraving / Scribing | — | Yes | Yes | Yes |
Typical handbook values for the default condition, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.