All data should be used as a guide only, and not an exact specification.
| Fabric | Metric Equivalent 1 | Thickness (imperial)2 | Thickness (metric)1,2 |
| 2.3 oz/yd2 fiberglass
(plain weave cloth) |
78 gm/m2 | 0.004" | 0.10 mm |
| 6.0 oz/yd2 fiberglass
(plain weave cloth) |
203 gm/m2 | 0.007" | 0.17 mm |
| 5.0 oz/yd2 Kevlar (TM)
(plain weave cloth) |
170 gm/m2 | 0.010" | 0.25 mm |
| 5.8 oz/yd2 Carbon Fiber
(plain weave cloth) |
197 gm/m2 | 0.009" | 0.23 mm |
| 9.0 oz/yd2 Carbon Fiber
(unidirectional) |
305 gm/m2 | 0.011" | 0.28 mm |
1 calculated values, approximate.
2 dry fiber thickness - to obtain total layup thickness, sum the dry fiber thickness of each individual layer, and then multiply by a weighting factor for laminated thickness; this factor may be greater than 1 for a hand layup, and less than one for a vacuum-bagged layup. Finally, add the estimated thickness of any final epoxy topcoat or paint.
For a simple layup of one layer of 6oz 'glass and one layer of 2.3 oz 'glass, with a topcoat of epoxy, you can safely assume a skin thickness of 0.5 mm per side, for a total of 1mm added to the overall thickness of the foil. This will be correct within any reasonable fabrication tolerances.
| Species | Specific Gravity | Density @ 8% Moisture | Density @ 12 % Moisture | Modulus of Elasticity @12% | Compressive Strength @ 12% |
| Western Red Cedar | 0.33 | 356 kg/m3
22 lb/ft3 |
369 kg/m3
23 lb/ft3 |
7,700 MPa
1,110,000 psi |
31,400 kPa
4,560 psi |
| Sitka Spruce | 0.42 | 454 kg/m3
28 lb/ft3 |
470 kg/m3
29 lb/ft3 |
9,900 MPa
1,570,000 psi |
35,700 kPa
5,610 psi |
| Alaskan Yellow Cedar | 0.46 | 497 kg/m3
31 lb/ft3 |
515 kg/m3
32 lb/ft3 |
9,800 MPa
1,420,000 psi |
43,500 kPa
6,310 psi |
| Douglas Fir | 0.50 | 540 kg/m3
34 lb/ft3 |
560 kg/m3
35 lb/ft3 |
12,600 MPa
1,790,000 psi |
47,600 kPa
6,900 psi |
| Phil. Mahogany | 0.54 | 583 kg/m3
36 lb/ft3 |
605 kg/m3
38 lb/ft3 |
11,200 MPa
1,630,000 psi |
|
| White Ash | 0.63 | 680 kg/m3
42 lb/ft3 |
705 kg/m3
44 lb/ft3 |
12,000 MPa
1,740,000 psi |
51,100 kPa
7,410 psi |
| Core-Cell LP1200 | 200 kg/m3
12 lb/ft3 |
200 kg/m3
12 lb/ft3 |
42,441psi??? | 500 psi |
Compiled from various sources found online, may contain errors. There is variability from tree-to-tree and even plank-to-plank within each species.
8% Moisture Content is typical of kiln dried lumber.
12% Moisture Content is typical of air dried lumber.
Compressive strength measured is parallel to grain.