The weight in kg and the price of a sheet or a cut piece of PP, other plastics or rubber, from its size, thickness and density. Type the rate you work with, in any unit, and see the same rate in every other unit. Nothing you type is saved or sent.
Nominal weight (kg) = length (m) x width (m) x thickness (mm) x density (g/cm3). It is the weight from size, thickness and density, not from a scale.
Example: an 8 x 4 ft PP sheet, 10 mm thick. 8 x 4 ft is 2,438.4 x 1,219.2 mm, so its area is 2.973 sq m. Weight = 2.973 x 10 x 0.91 = 27.05 kg.
The price is that weight x the rate per kg, or the area x the rate per sq m or sq ft. A cut piece is priced from its own weight or area. Rates and prices are before GST.
| Thickness | Weight | Weight per sq m |
|---|---|---|
| 3 mm | 8.12 kg | 2.73 kg |
| 4 mm | 10.82 kg | 3.64 kg |
| 5 mm | 13.53 kg | 4.55 kg |
| 6 mm | 16.23 kg | 5.46 kg |
| 8 mm | 21.64 kg | 7.28 kg |
| 10 mm | 27.05 kg | 9.10 kg |
| 12 mm | 32.46 kg | 10.92 kg |
| 15 mm | 40.58 kg | 13.65 kg |
| 20 mm | 54.11 kg | 18.20 kg |
Nominal weight at density 0.91. PP is 0.90 to 0.92 by grade.
| Sheet | Density (g/cm3) | kg per sq m, each mm | kg per 8 x 4 ft, each mm |
|---|---|---|---|
| PP | 0.91 | 0.91 | 2.71 |
| HDPE | 0.95 | 0.95 | 2.82 |
| UHMW-PE | 0.93 | 0.93 | 2.76 |
| Cast nylon | 1.15 | 1.15 | 3.42 |
| POM (acetal) | 1.41 | 1.41 | 4.19 |
| PET | 1.38 | 1.38 | 4.10 |
| PTFE | 2.15 | 2.15 | 6.39 |
| Acrylic | 1.19 | 1.19 | 3.54 |
| Polycarbonate | 1.20 | 1.20 | 3.57 |
| Rigid PVC | 1.44 | 1.44 | 4.28 |
| Rubber | Ask your supplier, often 1.0 to 1.6 |
Public datasheet values. Use your supplier's figure when you have it. Rubber depends on its compound and filler, so it has no single figure.
A real sheet is not exactly its nominal thickness. For extruded PP sheet, ISO 15013 allows 0.08 mm + 3% of the thickness either way at each point: about 11% at 1 mm and 4% at 10 mm. The scale check shows the average thickness a weighed sheet suggests. The price stays on nominal weight.
Type the thickness