Key Takeaways
- ISPM15 is a mandatory international standard for treating solid wood packaging to prevent timber pest spread — adopted globally in 2002 by the IPPC under the FAO.
- All wood packaging entering the UK from outside the EU, and all UK-EU movements since 1 January 2021, must carry a compliant ISPM15 mark showing treatment method and producer registration.
- Heat treatment (HT) requires wood core temperature to reach 56°C for at least 30 minutes — the most common and environmentally preferred method; methyl bromide (MB) fumigation is banned in the UK/EU.
- The ISPM15 mark must include the IPPC logo, two-letter country code (GB for Great Britain), unique producer registration number, and treatment code — non-compliant packaging can be refused, destroyed, or re-exported at your cost.
- Processed wood products (plywood, OSB, MDF, particle board) and wood thinner than 6mm are exempt from ISPM15 treatment requirements.
- UK producers manufacturing ISPM15-compliant packaging must register with the UKWPMMP — it is a statutory requirement enforceable under the Plant Health (Wood Packaging Material Marking) Forestry Order 2006.
What Is ISPM15 and Why It Matters to UK Importers
If your goods arrive in the UK on wooden pallets, in wooden crates, or secured with wooden dunnage, ISPM15 compliance is not optional — it is a legal requirement with real financial consequences at the border.
ISPM15 (International Standards for Phytosanitary Measures No. 15) is the global standard for treating solid wood packaging material (WPM) to prevent the international spread of timber pests. It was adopted in 2002 by the IPPC (International Plant Protection Convention) under the FAO, and implemented in the UK through the Plant Health (Wood Packaging Material Marking) Forestry Order 2006, which came into force on 6 November 2006.
The standard targets wood-boring pests that can hitchhike in untreated timber: longhorn beetles (family Cerambycidae), bark beetles (family Scolytidae), and the pine wood nematode (Bursaphelenchus xylophilus). These organisms can devastate native forests and timber industries if introduced to new regions.
For UK importers, the practical impact is straightforward: any solid wood packaging arriving without a compliant ISPM15 mark can be refused entry, ordered re-exported, or destroyed at your expense. The Forestry Commission’s Plant Health Forestry inspectors conduct checks at ports and points of entry, and enforcement powers are explicit under the 2006 Order.
Post-Brexit, the requirement tightened further. From 1 January 2021, all wood packaging material moving in both directions between the UK and the EU must be ISPM15 compliant — treated and marked. This removed the previous derogation that allowed untreated WPM within EU member states.
What Wood Packaging Is Covered (and What Is Exempt)
ISPM15 applies to solid wood packaging material thicker than 6mm used in international trade. The scope includes:
- Pallets (the most common vector for non-compliance)
- Crates and boxes
- Load boards and skids
- Spools and reels
- Dunnage (solid wood used to secure or support cargo within containers)
- Packing blocks
The key test is whether the wood is solid and whether it is thicker than 6mm. If both conditions are met, the material must be treated and marked.
Exemptions from ISPM15
The following materials are not subject to ISPM15 treatment requirements:
- Processed wood products: Plywood, OSB (oriented strand board), particle board, MDF (medium-density fibreboard), and veneer. These materials undergo manufacturing processes (heat, pressure, adhesive bonding) that eliminate pest risk.
- Wood thinner than 6mm: Thin wood strips, shims, and veneers below the thickness threshold.
- Non-wood alternatives: Cardboard, plastic, metal, or composite packaging materials.
- Dunnage used within a single vessel/container load: Enforcement varies by destination country, but dunnage that is part of the shipment and remains with the cargo is generally within scope.
If you specify packaging for imports, ensure your supplier understands these distinctions. A crate made from plywood does not require ISPM15 treatment; a crate made from solid timber does.
How to Read the ISPM15 Mark
Every compliant piece of wood packaging must carry a legible, permanent mark. The mark format is specified in the ISPM15 standard and administered in the UK by the UKWPMMP (UK Wood Packaging Material Marking Programme).
The mark must contain four elements:
- The IPPC logo: A stylised ear of wheat symbol, indicating the packaging meets the international standard.
- Two-letter ISO country code: GB for Great Britain. Following Brexit, there was industry discussion about changing to “UK”, but GB remains the ISO code used for ISPM15 marking.
- Unique producer/treatment facility registration number: A number assigned to the authorised facility that treated and/or manufactured the packaging.
- Treatment method abbreviation: HT (heat treatment), DH (dielectric heating), or MB (methyl bromide fumigation).
A typical mark reads: GB-12345-HT
The mark must be:
- Legible: Clear enough to read without magnification.
- Permanent: Applied by branding, stencilling, or other durable means — not a sticker or temporary label.
- Visible: Placed where inspectors can see it without disassembling the packaging.
Spotting Counterfeit or Invalid Marks
Non-compliant marks do appear in circulation. Red flags include:
- Marks that look printed or stuck on (should be branded or stencilled into the wood)
- Missing the IPPC logo
- Country codes that do not match the shipment origin (e.g., CN mark on goods from Vietnam)
- Treatment codes other than HT, DH, or MB (some non-standard codes exist but are not recognised in the UK)
- Smudged, incomplete, or altered marks
If you receive packaging with a suspicious mark, photograph it and report it to the Forestry Commission. Do not assume the packaging is compliant based on supplier assurances alone.
Treatment Methods: HT, DH, and MB
ISPM15 recognises three treatment methods, though only two are commonly used in the UK and EU.
HT (Heat Treatment)
Heat treatment is the standard method for ISPM15 compliance. The wood must be heated until its core temperature reaches 56°C for a minimum of 30 minutes. This is sufficient to kill wood-boring pests and their larvae without compromising the structural integrity of the timber.
HT is the preferred method for several reasons:
- No chemical residues remain in the wood
- Environmentally benign (no ozone-depleting substances)
- Widely available across the UK and EU
- Accepted by all ISPM15-participating countries
DH (Dielectric Heating)
Dielectric heating uses microwave or radio frequency energy to achieve the same core temperature requirement (56°C for 30 minutes). It is less common than HT but produces equivalent results. DH is sometimes used for thicker timber where conventional heat treatment would be impractical.
MB (Methyl Bromide Fumigation)
Methyl bromide fumigation was historically an accepted ISPM15 treatment method. However, it is banned in the UK and EU due to its ozone-depleting properties. MB may still be used in some non-EU countries, but packaging treated with MB should not be imported into the UK unless it originates from a country where MB is still permitted and the treatment is properly documented.
If you see an MB mark on packaging arriving from within the EU, it is likely non-compliant and should be flagged.
UK Import Requirements and Border Enforcement
When wood packaging arrives at a UK port or border control point, it is subject to inspection by the Forestry Commission’s Plant Health Forestry inspectors. The enforcement framework is clear:
Non-Compliance Outcomes
If non-compliant WPM is identified, the inspector can:
- Refuse entry: The shipment is denied entry and must be re-exported at the importer’s cost.
- Order destruction: The packaging is destroyed by incineration or other approved means, with costs charged to the importer.
- Hold for treatment: If treatment facilities exist at the port, the packaging may be held and treated (costs apply).
The financial implications can be significant. Re-export costs include freight, handling, and administrative fees. Destruction costs vary by port and volume but typically run into hundreds of pounds per shipment. Delays while non-compliance is resolved can disrupt supply chains and incur demurrage charges. For context on broader border processes, see our customs clearance step-by-step guide.
Who Bears the Cost?
This depends on your Incoterms agreement. Under DDP (Delivered Duty Paid), the seller bears all costs including customs clearance and compliance — so non-compliant WPM rejection costs fall on the exporter. Under FOB (Free on Board) or EXW (Ex Works), the buyer (UK importer) assumes responsibility once goods are loaded or collected, meaning you bear the cost of WPM non-compliance. See our Incoterms explained guide for a full breakdown of risk transfer points.
Specify ISPM15 compliance explicitly in your purchase contracts. A clause such as “All wood packaging material must be ISPM15 compliant and carry a valid mark” shifts liability to the supplier if non-compliant packaging arrives. For importers concerned about overall duty and tax exposure, our UK import duty guide covers the full cost picture.
UK Export Requirements and Producer Registration
If you are a UK-based business that manufactures, repairs, or re-manufactures wood packaging for export, you must register with the UKWPMMP. This is a statutory requirement enforceable under the Plant Health (Wood Packaging Material Marking) Forestry Order 2006.
The UKWPMMP is administered by TIMCON (Timber Packaging and Pallet Confederation) on behalf of the Forestry Commission (Great Britain) and the Forest Service (Northern Ireland). An Advisory Council oversees the programme, including representatives from the Forestry Commission, Forest Service, TIMCON, NAPD (National Pallet and Distributors), UKFPA (UK Forest Products Association), CHEP, and BREPAL.
Registration Process
To register:
- Contact TIMCON or the Forestry Commission to initiate registration.
- Your facility will be audited to confirm compliance with ISPM15 treatment standards.
- Upon approval, you receive a unique registration number for use in the ISPM15 mark.
- You must maintain records of treatments applied and allow periodic inspections.
Operating without registration while producing ISPM15-marked packaging is an offence under the 2006 Order.
Export Marking for GB
UK exporters must use the correct country code in the ISPM15 mark. For Great Britain, this is GB. Northern Ireland has distinct arrangements under the Windsor Framework — consult the Forest Service (Northern Ireland) for specific guidance if exporting from NI.
Destination countries may have additional requirements beyond ISPM15. For example, some countries require phytosanitary certificates for wood packaging even when ISPM15-compliant. Check the import requirements of your destination market before shipping.
Practical Compliance Steps for UK Importers
To minimise the risk of non-compliant WPM arriving at your premises:
- Specify ISPM15 in contracts: Include explicit language requiring ISPM15-compliant packaging with valid marks.
- Inspect on arrival: Check a sample of pallets and crates before accepting delivery. Look for the four-part mark (IPPC logo, country code, registration number, treatment code).
- Photograph non-compliance: If you find non-compliant packaging, photograph the mark and the packaging. Report it to your supplier and the Forestry Commission.
- Segregate and store: Keep ISPM15-compliant pallets separate from non-compliant stock. Re-use compliant pallets for exports where possible.
- Train warehouse staff: Ensure receiving staff know what a valid ISPM15 mark looks like and can flag suspicious packaging.
For frequent importers, consider maintaining a list of approved suppliers who consistently provide ISPM15-compliant packaging. This reduces inspection burden and supply chain risk.
Frequently Asked Questions
What happens if my shipment arrives with non-ISPM15 compliant packaging? The Forestry Commission can refuse entry, order re-export, or destroy the packaging at your cost. Delays and demurrage charges are common. Specify ISPM15 compliance in your purchase contracts to shift liability to the supplier.
Is ISPM15 required for UK-EU trade after Brexit? Yes. From 1 January 2021, all wood packaging material moving between the UK and the EU must be ISPM15 compliant — treated and marked. The previous intra-EU derogation no longer applies.
Do I need ISPM15 compliance for domestic UK shipments? No. ISPM15 applies only to wood packaging used in international trade. Domestic movements within the UK do not require ISPM15 treatment or marking.
How long is an ISPM15 mark valid? The mark remains valid as long as the packaging is not repaired or remanufactured. If a pallet is repaired with new solid wood, the new wood must be treated and the mark reapplied. Processed wood repairs (plywood, etc.) do not require re-treatment.
Can I use a sticker or label for the ISPM15 mark? No. The mark must be permanent — branded, stencilled, or otherwise applied directly to the wood. Stickers, labels, or printed tags are not compliant and will be rejected at border inspection.
Are plastic pallets subject to ISPM15? No. ISPM15 applies only to solid wood packaging thicker than 6mm. Plastic, metal, cardboard, and processed wood products (plywood, OSB, MDF) are exempt from treatment and marking requirements.