Burst factor (BF): Burst factor is the bursting strength of paper divided by its grammage. It lets buyers compare the strength of grades of different weights.
In more detail
Bursting strength is the pressure a sheet withstands before it ruptures. Dividing it by GSM gives the burst factor, the figure Indian corrugators most often use to specify kraft paper (for example 18 BF or 22 BF).
Why it matters
For corrugated boxes, BF together with GSM sets how much load the board can carry. Recycled grades depend heavily on the quality of the recovered fibre.
How it is measured or specified
Tested with a Mullen-type burst tester on conditioned samples. Agree the test method and a minimum value.
Questions
What is Burst factor?
Burst factor is the bursting strength of paper divided by its grammage. It lets buyers compare the strength of grades of different weights.
Why does Burst factor matter to buyers?
For corrugated boxes, BF together with GSM sets how much load the board can carry. Recycled grades depend heavily on the quality of the recovered fibre.
Why does Burst factor matter?
For corrugated boxes, BF together with GSM sets how much load the board can carry. Recycled grades depend heavily on the quality of the recovered fibre.
Explain Burst factor in more detail.
Bursting strength is the pressure a sheet withstands before it ruptures. Dividing it by GSM gives the burst factor, the figure Indian corrugators most often use to specify kraft paper (for example 18 BF or 22 BF).
How is Burst factor measured or specified?
Tested with a Mullen-type burst tester on conditioned samples. Agree the test method and a minimum value.
What is GSM?
GSM is the weight of one square metre of paper or board in grams. It is the basic measure of how heavy, and roughly how strong and costly, a grade is.
What is Corrugated board and ply?
Corrugated board is made of flat liners glued to wavy flutes. "Ply" counts the layers: 3-ply has two liners and one flute.
What is Box compression test?
BCT is the load a box can bear before it buckles. It is the most useful single number for how high boxes can be stacked.