Choosing the wrong pallet for international shipping can result in rejected shipments, destroyed goods, and costly delays. Understanding the difference between heat treated and standard pallets helps you avoid these problems.
What Are Heat Treated Pallets?
Heat treated pallets undergo a process to kill pests and diseases in the wood. The wood gets heated to 56°C for at least 30 minutes throughout its core. This eliminates insects, larvae, and harmful organisms.
After treatment, pallets receive an ISPM 15 stamp proving they meet international standards. The stamp includes the country code, producer code, and treatment method (HT for heat treatment).
Heat treated pallets look like regular pallets but carry this official marking. The treatment does not change the pallet’s strength or lifespan.
Understanding Standard Pallets
Standard pallets are made from untreated timber. They work well for moving goods within the UK. No special treatment or marking is required for domestic use.
These pallets cost less than heat treated versions. For businesses only shipping within the UK, standard pallets provide good value.
However, standard pallets cannot be used for most international exports. Many countries refuse shipments on untreated pallets to protect forests and crops from invasive pests.
ISPM 15 Compliance Requirements
ISPM 15 stands for International Standards for Phytosanitary Measures Number 15. This standard prevents the spread of wood-boring insects and plant diseases through wooden packaging.
The UK government’s guidance on wood packaging material explains that solid wood packaging moving between Great Britain and other countries must meet ISPM 15 standards, including movements to EU countries.
Countries enforce these rules strictly. Customs check pallets at borders. Non-compliant shipments face rejection, destruction, or expensive re-treatment. The shipper bears all costs.
Suppliers must be members of the UK Wood Packaging Material Marking Programme and undergo regular inspections.
When You Must Use Heat Treated Pallets
Heat treated pallets are required for international shipping to most countries including:
- European Union countries
- United States and Canada
- China and Asian markets
- Australia and New Zealand
- South America, Africa, and Middle East
Even empty pallets for supply require ISPM 15 compliance. Professional export pallet suppliers can advise on country-specific regulations.
Wood products like plywood and particleboard are exempt, as are materials thinner than 6mm.
| Pallet Type | Domestic Use | Export to EU | Export Worldwide | Cost | Marking Required |
| Standard Pallets | Yes | No | No | Lower | None |
| Heat Treated Pallets | Yes | Yes | Yes (most countries) | Higher | ISPM 15 stamp |
The Heat Treatment Process Explained
Heat treatment starts with debarking the timber. Bark can harbour pests, so it must be removed. Small pieces less than 3cm wide can remain.
The debarked wood goes into a heating chamber. The entire pallet must reach 56°C and stay at this temperature for at least 30 continuous minutes. Temperature probes ensure proper heat throughout.
Some facilities use dielectric heating for smaller pieces. This heats wood under 20cm wide to 60°C for one minute. Both methods effectively kill all pests.
After cooling, workers stamp each pallet with the ISPM 15 mark. This mark stays on the pallet unless it gets repaired or shows signs of new infestation.
Choosing the Right Supplier
Select suppliers who are members of the UK Wood Packaging Material Marking Programme. This guarantees proper treatment procedures and correct markings.
Experience with export markets matters. Suppliers like CM Pallets who regularly supply export businesses understand country-specific requirements and can advise on special needs.
Check suppliers maintain detailed treatment logs for traceability. Ask if they keep stocks of common sizes for quick delivery when you need urgent exports.
Common Mistakes to Avoid
Using standard pallets for exports is the most common mistake. Even if previous shipments got through, customs enforcement is unpredictable. One rejected shipment can cost thousands.
Never assume pallets are treated without checking. Pallets must carry the ISPM 15 stamp to prove treatment. If you cannot see clear marking, assume the pallet is not compliant.
Repairing heat treated pallets with untreated wood invalidates their certification. Repairs must use treated wood and require re-marking.
Always check destination country requirements and order heat treated pallets with enough lead time before shipping deadlines.
Documentation and Record Keeping
Heat treated pallets do not need separate certificates – the ISPM 15 mark provides certification. However, keep records of supplier details, purchase dates, and photograph the stamps clearly. This helps if customs asks questions.
For regular exporters, maintaining a database of compliant pallet suppliers streamlines ordering.
Frequently Asked Questions
Can I use standard pallets for exports to any countries?
Very few countries accept untreated wooden pallets. Most require ISPM 15 compliance. Always verify requirements before shipping.
How long does heat treatment remain valid?
Heat treatment is permanent as long as the pallet stays intact and shows no signs of new infestation. The mark remains valid unless repairs use new wood or pests appear.
Can I repair a heat treated pallet?
Yes, but repairs must use heat treated wood. After repair, the pallet needs re-marking by a certified facility.
Are plastic pallets exempt from ISPM 15?
Yes, plastic pallets do not require treatment as they are not wood. However, they cost significantly more than wooden pallets.
What happens if my shipment uses wrong pallets?
Customs may refuse entry, requiring re-export at your cost. They may order destruction or require expensive fumigation at destination. All costs fall on the shipper.
Choosing between heat treated and standard pallets depends on where your goods go. For domestic UK shipments, standard pallets work fine. For international exports, heat treated pallets meeting ISPM 15 standards are essential.
