When you are manufacturing products overseas, it is important to take all possible steps to ensure product quality. More than that, you have to ensure that your products survive the journey from the factory to the port and then across the ocean to you.
Have you ever seen videos of airline workers handling luggage and tossing suitcases across the tarmac as if they were giant rectangular baseballs?
If so, you know that luggage is not always handled with the utmost of care. And you may not realize it, but your cartons can receive similar treatment during their journey. This is why carton drop tests exist.
Carton strength is an important consideration that importers sometimes overlook. It is essential to ensure that your master cartons can withstand being dropped multiple times and from different angles. This is essentially what a carton drop test works to simulate.
Here are 7 things you need to know about carton drop tests.
#1 – ISTA 1A Lays Out the Accepted International Standards for Drop Tests
The International Safe Transit Association (ISTA) is, according to their website, “an organization focused on the specific concerns of transport packaging.”
With that focus in mind, the association has developed a number of protocols, including ISTA 1A. It outlines acceptable procedures for a number of different tests, including vertical shock tests, alternative incline tests, alternative horizontal tests and, of course, carton drop tests.
The ISTA 1A drop test procedure is the accepted international standard.
#2 – Drop Test Height (See Chart) is Determined by Carton Weight
You may be curious about what height the carton should be dropped from.
Drop height is determined based on the weight of a carton. A carton that weighs less than 21 lbs (10 kgs) will be dropped from a height of 30 inches (760 mm), while a carton weighing 100 lbs (45 kgs) will be dropped from a height of 8 inches (200 mm).
#3 – Cartons are Dropped 10 Times During Testing (See Diagram)
When performing a drop test, the carton is dropped on its most fragile corner, three of its edges, and six of its faces. In the diagram below, you can see how the faces, edges, and corner are identified.
In the table below you can see the details of the drop sequence. The carton will be dropped a total of 10 times.
#4 – After the Drop Test, Your Carton is Opened to Determine a Pass or Fail Result
Once the carton has been dropped from the appropriate height 10 different times, it will now be opened. The drop test is failed if any of the following is found.
- Damage to the export carton
- Damage to the product packages inside
- Scratches, dents, or other damage to products
- The products are not functioning as expected
If your cartons fail the test, it essentially means that they are not strong enough.
#5 – Burst Strength is Key to Passing Drop Tests
In order to ensure that your cartons are strong enough to pass a drop test, burst strength is one of the main considerations to keep in mind.
Burst strength is a measure of a box’s resistance to rupturing. It is measured in Pounds per Square Inch (PSI). At Insight, we recommend using cartons with a burst strength of 200 PSI for protection against rupture. Master cartons should have a seal specifying the burst strength and carton manufacturer, generally on the bottom side of the carton.
This should be sufficient to pass standard drop tests. While some factories have the necessary equipment to test and verify burst strength most do not. It would be necessary to send a sample carton to a testing lab if necessary to verify burst strength.
#6 – ISTA 1A Outlines More Than Just Drop Test Standards
In addition to carton drop tests, ISTA 1A outlines procedures for vertical shock tests, alternative incline tests, and alternative horizontal tests.
These tests are much less common and aren’t done by the average importer. They require the use of specialized equipment such as a shock test machine, incline impact tester and horizontal impact test system.
Drop tests, on the other hand, are fairly common.
#7 – Drop Tests Can be Done as Part of Your Pre-Shipment Inspection
A carton drop test is most valuable when done on your first shipment and it can be performed as part of any pre-shipment inspection. By including it in your pre-shipment inspection, you can help ensure that the cartons you use are less likely to rupture and cause damage to your products and packaging.
By using high-burst-strength cartons capable of passing a drop test, you can be more confident that your products will make it to the country of importation unharmed.
If you are thinking of conducting a pre-shipment inspection, we recommend reading the following ebook.