How to Measure a box

Size: The size of a corrugated box is always in the sequence: Length x Width x Depth (height) The above measurements are known as the inside dimensions and are always used in determining the proper size to ensure a good fit. With the box open- the Length is the largest dimension, the width the smaller dimension and the depth (height) is perpendicular to the opening. Corrugated pads and sheets with only two dimensions have their size specified with the first dimension parallel to the flutes.

Singlewall: A corrugated wave shape known as flutes or corrugated medium with two flat facings of linerboard, one bonded to each side also known as a double face sheet or single wall. This widely used and durable construction is produced into a number of container and packaging components. This corrugated material is available in a wide range of strengths (tests)

Doublewall: Three sheets of linerboard with two interleaved and laminated corrugated mediums (flutes). This material is often used when extra protection and rigidity is needed. Also used for packaging and stacking heavy

Tests and board strengths: Corrugated linerboard strength is measured in two ways: Bursting strength and Edge crush. Bursting strength- is the force required to break through combined board using pressure, which is related to the box’s ability to withstand both internal and external force.

Edge crush: as an alternative is measured in the amount of force required to crush an edge of combined board, which predicts the compression strength of the finished box. Corrugated sheets strength is determined by the different weights of linerboard facings and mediums that it is made up of. Refer to our conversion chart to determine what board and strength of material for your requirements. Corrugated linerboard is most often produced in Kraft (brown). We also offer boxes to be made in oyster (white). Oyster board gets its color through a bleaching process and is therefore more expensive.

Start with the weight of your contents to determine the strength of corrugated material you require.

Singlewall Corrugated Boxes:
Maximum weight of box and contents (lbs.)	Minimum bursting test singlewall, doublewall	Minimum edge crush
20	125	23
35	150	26
50	175	29
65	200	32
80	250	40
95	275	44
120	350	55

*Doublewall Corrugated Boxes:*
Maximum weight of box and contents (lbs.)	Minimum bursting test singlewall, doublewall	Minimum edge crush
80	200	42
100	275	48
120	350	51
140	400	61
160	500	71
180	600	82