Essential Pallet Requirements for International Shipments

Resources > Essential Pallet Requirements for International Shipments
To ensure your palletized shipments can leave the country, you’ll need to complete a few important steps. We’ll explain these steps and show you how to complete them correctly.
Published: January 21, 2022
Last Modified: January 15, 2025
Author: Jacob Lee

Shipping goods overseas is a great way to reach new markets. However, with international shipments come rules and regulations you need to follow to make sure shipments are accepted upon arrival. 

Key takeaways:

  • Wood packaging materials, like pallets, must receive ISPM-15 heat treatment. 
  • Plastic pallets are an acceptable alternative to wood. 
  • International palletized shipments should be labeled with all the relevant information about the shipper, receiver, and cargo.
  • Pallets should be stacked no higher than 60 inches (1524 millimeters), or five feet (1.5 meters). 

In this guide, you will find detailed requirements that need to be followed when using pallets for international transport. 

Why Are International Pallet Requirements Important?

The U.S. exports a high volume of cargo to other countries every year. Much of this freight is loaded onto pallets. To give you an idea of how much freight is shipped from the U.S. internationally, consider some data provided by Statista.

The graphic display a horizontal bar graph of the volume of US exports of traded goods between 2019-2023. The year 2019 is represented by a light blue bar that shows the US exported $1.65 trillion in goods. The year 2020 is represented by a dark blue bar that shows the US exported $1.43 million in goods. The year 2021 is represented by a cobalt blue bar that shows the US exported $1.75 million in goods. The year 2022 is represented by a gray blue bar that shows the US exported $1.83 million in goods. The year 2023 is represented by a gray bar that shows the US exported $2.02 million in goods.

With so much freight leaving the U.S., it’s clear that you’ll need to know the necessary palletization requirements to ensure your shipments are a success. 

Do I Need to Heat Treat My Pallets?

Wood that is being shipped internationally must be fumigated or heat treated. This includes wood packaging materials such as pallets, crates, and dunnage. This is a requirement regardless of what method is used to transport the pallets. 

The reason that this requirement is in place is because of something called ISPM — 15 or the International Standards for Phytosanitary Measures No. 15. This measure was created by the International Plant Protection Convention (IPPC).   

ISPM-15

The purpose of ISPM — 15 is to prevent the spread of pests and diseases that could potentially be traveling inside wood packaging materials. Pests can be eliminated either by heat treating or fumigating pallets. 

If you choose the heating method, wood packaging material must be heated until its internal temperature is 56 degrees Celsius (132.8 degrees Fahrenheit) or higher. Materials must remain at or above that temperature for 30 minutes.

You can also fumigate your pallets with a chemical called methyl bromide. When using this method, pallets are placed into a sealed chamber. Methyl bromide is then released into the chamber, where it will kill any pests present in the wood packaging materials. Fans are often placed in the enclosure to help spread the chemical. 

While fumigation is a viable option, heat treatment is more popular. For one, the IPPC recommends heat treatment because it’s an easier way to kill pests and diseases. Heat treatment also doesn’t involve the use of chemicals, which makes it a safer solution. 

ISPM — 15 Stamp

Once the wood has finished being heated or fumigated, it is given a stamp or branding that has the IPPC's internationally recognized mark. 

An official ISPM — 15 stamp will include:

  • IPPC Agency Trademark: This is the IPPC’s unique logo.
  • Facility Identification: This represents the company that’s been given the authority to use the ISPM — 15 stamp.
  • HT or MB Mark: The HT mark will be used if your pallets were heat treated, and the MB mark will be used if your pallets were fumigated. 
  • Country Code: A two letter abbreviation will be used to represent the origin of your pallets.
  • IPPC Approved: This is the international symbol used to represent compliant wood packaging.
  • DUN: You will see this abbreviation if your pallets are made from dunnage.

After your pallets have received an ISPM — 15 stamp, you can reuse them for multiple international shipments. However, this will only apply as long as your pallets haven’t been repaired, manufactured, or modified in any way. 

Wood that is engineered, like plywood, hardboard and OSB, are exempt from ISPM-15. Before you put your wood packing materials through heat treatment, check to make sure they’re not made of wood that is exempt from the requirement. 

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What About Plastic Pallets?

While wood remains a popular choice in the shipping industry, you can use plastic pallets if you choose. There are many benefits to be reaped from using plastic pallets.

This includes:

  • Exclusion from ISPM-15 requirements 
  • Longer lasting
  • Durable materials

While plastic pallets have their benefits, they also come with some downsides. When it comes to expenses, you will be spending more on plastic pallets than wooden ones. However, paying more for plastic pallets might seem worth it since they last longer.

Plastic pallets cannot hold up freight that has a total weight of 1,500 pounds (680.38 kilograms) or more. For reference, most wooden 48 x 40 inch pallets can hold up to 4,600 pounds (2086.52 kilograms). Finally, any damage that pallets do sustain cannot be repaired. They will either have to be disposed of or remodeled into a new pallet. 

Proper Labeling Procedures

You’ll need to make sure that your shipping label appears on your international palletized freight. 

It should contain the following information:

  • Supplier Information (name address or return address)
  • Buyer Information (name and destination address)
  • Serial Shipping Container Code (SSCC)
  • Description of the Products
  • Quantity of Products 
  • Date Code (if applicable)
  • Batch Number (if applicable)  

Depending on the freight you’re shipping, you might want to place labels that give specific directions on how your cargo should be handled. You can include labels that say “do not double stack” or “this side up” and other warnings and directions as needed.

Placing duplicates of your shipping label on each side of the palletized load is essential. At the least, you want to have two duplicates of every label you use.

Pallet labels can be blocked from view by the walls of shipping containers or by other shipping pallets next to them. Having duplicate labels on each side of your shipment will help workers and forklifts operators find them more easily. 

How Should Pallets Be Loaded?

The Occupational Safety and Health Administration (OSHA) gives a fairly vague description as to how pallets should be loaded. OSHA simply states that pallets should be loaded in a way that prevents them from sliding or collapsing. However, there is no set international standard.

The most reliable solution is to follow best practices to ensure a load is safe for all manner of typical handling. Secondly, use a reputable company that shows you how to stack, strap, and wrap freight to a pallet. This will ensure that your cargo stays secure while in transit. 

How High Can Freight Be Stacked On Pallets?

The safest maximum height for freight that is secured to a pallet is 60 inches (1524 millimeters), or five feet (1.5 meters). This allows you to load a considerable amount of freight, without the worry of your cargo falling over.  

Freight that is too high can be unsafe for the freight itself and any workers handling it. Extremely tall stacks of freight can become unstable and tip over. Additionally, freight that exceeds this height becomes considerably harder to strap down and wrap.   

How Wide Can Pallets Be?

Pallets come in various types of widths. While your pallets don’t need to meet a certain width requirement, we do recommend a pallet width of 96 by 125 inches (2438.4 by 3175 millimeters) or under. 

Pallets of this measurement are typically used for air freight. If you’re shipping your freight internationally by rail or cargo ship, then a 48”x40” pallet is a great option. 

Let USA Truckload Shipping Handle Pallet Requirements for International Shipments for You

At USA Truckload, we provide a variety of 3PL services to our customers. Our large network of carriers and logistics partners allows us to serve businesses and retailers all across the United States. We specialize in moving bulk palletized freight, but we can also accommodate for other types of cargo. 

Some services we provide include:

  • Freight and Logistics Consulting: Meet with one of our 3PL industry experts to discuss the requirements pertaining to your shipment. 
  • Expedited Freight Shipping: If your freight is on a tight schedule, we can speed up the shipping process and get your cargo to the final destination on time. 
  • Drayage: We have the capability to pick up and drop off your container from any port in the United States.

Get started with one of our services by filling out your Request for Proposal (RFP). If you have any further questions about the services we offer, you can contact our team at (866) 353-7178.

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2 comments on “Essential Pallet Requirements for International Shipments”

  1. We would like to have 2 pallets prepared for shipping to South Africa. We were unaware of the ISPM-15 requirements. The pallets are currently prepared for domestic shipping and will likely have to be re-palletized. The pallets are not baked. Please advise as to the cost for this service the pallet dimensions and load weights are as follows: 1) secured to pallet, in triple corregated secured box 67"x37"x62"H, 600lbs 2) crated pallet 56"x56"x94"H, 500lbs

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