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Wholesale Packaging sells & ships moving boxes, bubble wrap, foam chips, Tape & mattress bags in Toronto
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Cardboard Box Certificate
This part of the box certificate specifies whether corrugated carton is constructed from one or many corrugated cardboard layers. Our boxes meet all construction requirements of Canadian freight classification. [more info]

Edge Crush Test is a new standard that has achieved a widespread acceptance. It is considered as being a true performance test and is directly related to the stacking strength of a carton. ECT value represents the edgewise compressive strength of corrugated board. It is measured in ponds per linear inch (lb/in) and usually reported as ECT value (Ex: 40 ECT).


Corrugated Board Strength Equivalencies
Single Wall Corrugated

Minimum Edge Crush Test (ECT) Maximum Suggested
Loading Limit Per Carton (lbs.)
23 20
26 35
29 50
32 65
44 95
55 120

Corrugated Board Strength Equivalencies
Double Wall Corrugated
Minimum Edge Crush Test (ECT) Maximum Suggested
Loading Limit Per Carton (lbs.)
42 80
48 100
51 120
61 140
71 160
82 180


This part of the box certificate specifies the maximum size of the box. (L + W + H)  [more info]

This part of the box certificate specifies the maximum weight this box will hold. Boxes loaded above the "Gross WT. LT." will tend to get damaged very easily.   Legally, a shipper can refuse to pay a damage claim if a damaged box was loaded beyond it's capacity.

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