Calculate grammage, bursting factor, or burst strength from any two values, with units for g/m², kg/m², oz/yd², gf/cm², Pa, and psi.
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Bursting Factor Formula
The bursting factor calculator uses the relationship between burst strength, grammage, and bursting factor. Enter any two values to solve for the third.
- BF = bursting factor, treated as a unitless value
- BS = burst strength, usually entered in gf/cm², Pa, or psi
- G = grammage, usually entered in g/m², kg/m², or oz/yd²
The calculator first converts the entered values to base units: grammage to g/m² and burst strength to gf/cm². It then applies the formula and converts the result back to the unit selected for the missing value.
- To calculate bursting factor: burst strength is divided by grammage.
- To calculate burst strength: bursting factor is multiplied by grammage.
- To calculate grammage: burst strength is divided by bursting factor.
Common Units Used for Bursting Factor Calculations
These are the unit conversions used when comparing grammage and burst strength values.
| Measurement | Unit | Conversion to Base Unit |
|---|---|---|
| Grammage | g/m² | 1 g/m² = 1 g/m² |
| Grammage | kg/m² | 1 kg/m² = 1000 g/m² |
| Grammage | oz/yd² | 1 oz/yd² = 33.9057 g/m² |
| Burst strength | gf/cm² | 1 gf/cm² = 1 gf/cm² |
| Burst strength | Pa | 1 Pa = 0.0101972 gf/cm² |
| Burst strength | psi | 1 psi = 70.3069 gf/cm² |
Typical Result Checks
| Given Values | Calculation | Result |
|---|---|---|
| BS = 3500 gf/cm², G = 140 g/m² | 3500 / 140 | BF = 25 |
| BF = 28, G = 180 g/m² | 28 × 180 | BS = 5040 gf/cm² |
| BS = 4200 gf/cm², BF = 30 | 4200 / 30 | G = 140 g/m² |
Examples
Example 1: Calculate bursting factor
You have a paper sample with a burst strength of 3600 gf/cm² and a grammage of 120 g/m².
The bursting factor is 30.
Example 2: Calculate burst strength
You have a bursting factor of 24 and a grammage of 150 g/m².
The burst strength is 3600 gf/cm².
FAQ
What does bursting factor mean?
Bursting factor is a measure of bursting strength relative to grammage. It helps compare materials of different weights by dividing the burst strength by the grammage. A higher bursting factor generally means the material has greater bursting resistance for its weight.
What is the difference between burst strength and bursting factor?
Burst strength is the pressure a material can withstand before it ruptures. Bursting factor adjusts that strength by the material’s grammage. Burst strength is a direct pressure measurement, while bursting factor is a comparison value based on both strength and material weight.
Why do I need to enter exactly two values?
The formula has three variables: burst strength, grammage, and bursting factor. If you enter any two, the third can be calculated. If you enter only one value, there is not enough information. If you enter all three, there is no missing value to solve for.
