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Weight (kg) = Length (m) × Width (m) × Thickness (m) × Density (kg/m³)
If the dimensions are given in mm, you can use the following formula directly:
Weight (kg) = Length (mm) × Width (mm) × Thickness (mm) × Density (g/cm³) ÷ 1,000,000
For example:
FR4 Epoxy Fiberglass Sheet: 1220 × 2440 × 3 mm
Density: 2.0 g/cm³
1220 × 2440 × 3 × 2.0 ÷ 1,000,000 ≈ 17.86 kg/sheet
Therefore:
100 sheets × 17.86 kg ≈ 1,786 kg
Number of Sheets = Total Weight ÷ Weight per Sheet
For example, if the total required weight is 1,786 kg:
1,786 ÷ 17.86 = 100 sheets
For epoxy sheets with fixed length and width:
Weight per Sheet ≈ Length × Width × Thickness × Density
Therefore, for sheets with the same length, width, and density,the weight increases linearly with thickness.
For example, for a 1220 × 2440 mm epoxy sheet with a density of 2.0 g/cm³:
| Thickness | Theoretical Weight per Sheet |
|---|---|
| 1 mm | 5.95 kg |
| 1.5 mm | 8.93 kg |
| 2 mm | 11.90 kg |
| 3 mm | 17.86 kg |
| 5 mm | 29.77 kg |
| 10 mm | 59.54 kg |
This formula is particularly convenient for
epoxy sheet quotation and cost calculations:
Weight per Square Meter (kg/m²) = Thickness (mm) × Density (g/cm³)
For example, for FR4 with a density of 2.0 g/cm³:
| Thickness | Density | Theoretical Weight |
|---|---|---|
| 1 mm | 2.0 g/cm³ | 2.00 kg/m² |
| 1.5 mm | 2.0 g/cm³ | 3.00 kg/m² |
| 2 mm | 2.0 g/cm³ | 4.00 kg/m² |
| 3 mm | 2.0 g/cm³ | 6.00 kg/m² |
| 5 mm | 2.0 g/cm³ | 10.00 kg/m² |
| 10 mm | 2.0 g/cm³ | 20.00 kg/m² |
Then:
Weight per Sheet = Sheet Area × Weight per Square Meter
For example, for a 1220 × 2440 mm sheet:
Sheet Area:
1.22 × 2.44 = 2.9768 m²
For a 3 mm thick sheet:
2.9768 ×6.00 kg/m² = 17.86 kg/sheet
The calculated values above are theoretical weights based on the specified density.Actual sheet weight may vary slightly due to manufacturing tolerances, resin content,thickness tolerances, and actual material density.
