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Box strength guidelines

After years of testing and analysis UPS have developed the first ever box strength guidelines for the small parcel environment.

This is critical considering that the only guidelines for the last 90 years have been for palletized freight shipments. Box strength guidelines for the small parcel environment have never existed...until now.

When looking at a Box Maker's Certificate (found on the bottom of most shipping containers) it specifies the strength of the box (91 kilos per square inch) and the associated weight limit of the box (30 kilos). However, the weight limit specified is only applicable for palletized freight shipments. Based up the research and findings, an 18 kilos weight limit for that same 91 kilo box has been established.

The box strength guidelines also take into consideration the strength differences between bursting strength and edge crush strength containers. In the palletized freight environment, a 41 kilo burst strength and a 32 edge crush strength box each have a weight limit of 30 kilos. However, our research (along with documented studies from the corrugated industry) has proven that edge crush boxes have approximately 25 percent less tearing and containment strength than burst strength boxes.

Taking this strength difference into consideration, the guidelines specify a 14 kilo weight limit for a 32 edge crush box as opposed to the 18 kilo weight limit for 90 kilos.

Note these are only guidelines. We encourage customers to submit any packaging changes to professional performance testing before any packaging material or methods are finalized. This is the only way to ensure that their packaging provides the right level of product protection. Implementing packaging changes without pre-shipment performance testing can have significant implications, including excessive packaging costs, increased damage risks, high damage-related costs, dissatisfied customers and potential lost sales.

A
Maximum Weight
of Contents (Kgs)
B
Size Limits of Box (cm)
L + W + H
C
Bursting Test
(kg per sq cm)
D
Edge Crush Test (ECT)
(kg per cm width)
SINGLE WALL CORRUGATED CONTAINERS
13.6190.590.7114.51
18.14190.590.7118.14
22.6215.9113.3919.95
29.48241.3124.7324.94
36.28266.7158.75NA
DOUBLE WALL CORRUGATED CONTAINERS
27.21215.990.7121.77
36.28241.3124.7323.13
45.35266.7158.7527.66
54.43279.4181.4332.2
63.5292.1226.7937.19
68.03304.8272.15NA
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