Is Pallet Wood Treated? What You Need to Know
Some pallets are treated, some aren't, and the treatment type matters a lot if you plan to reuse them. Here's how to tell, what each treatment means, and which pallets are safe for DIY projects, garden furniture or indoor use.
The short answer
Most UK pallets either carry no treatment (domestic use) or are heat-treated (HT) under ISPM15 for export. Heat treatment uses only heat, no chemicals, and HT pallets are safe to reuse. Methyl bromide (MB) pallets were fumigated with toxic gas and must never be repurposed for DIY or indoor use. Check the stamp before reusing.
The treatment types you might see
- No treatment: most domestic UK pallets. Pine or spruce timber, kiln-dried during manufacture, no chemicals added. Safe to reuse.
- HT (heat-treated, ISPM15): heated to 56°C core for 30 minutes. No chemicals, no residue. Safe to reuse.
- KD (kiln-dried): reduces moisture content. Some but not all KD pallets are ISPM15-certified. KD alone is no treatment concern for reuse: safe.
- DB (debarked): timber bark removed to prevent pest harbourage. Safe for reuse.
- DH (dielectric heating): fast heat-treatment via microwave/radio frequency. Safe for reuse.
- MB (methyl bromide fumigated): historically used for ISPM15. Toxic gas residue possible. NEVER reuse for furniture, indoor projects, child-facing items or anything involving cutting/planing. Phased out in UK/EU.
- Pressure-treated (CCA, creosote): very rare in pallets but can appear in old industrial pallets. Contains copper/chromium/arsenic or coal tar. NEVER reuse.
How to check a pallet's treatment
Look at the corner block or stringer. ISPM15-stamped pallets have the IPPC logo, country code, facility number and treatment code. See the stamps decoded guide. If there's no stamp at all, the pallet is most likely a domestic untreated UK pallet.
Visual warning signs to avoid reuse: unusual stains (chemicals spilled), painted surfaces, oily residue, pungent smells (chemical preservatives), or pallets that lived outside at industrial sites. When in doubt, don't reuse for anything food-adjacent or indoor.
Safe pallet reuse guide
- DIY furniture and garden projects: untreated or HT-stamped pallets only. Sand down any splinters. Seal or paint for outdoor use.
- Vegetable planters: untreated or HT only. Line with plastic if you want extra assurance. Avoid any pallet that has visible stains.
- Indoor furniture: untreated or HT only. Seal to manage splinters.
- Firewood: HT or untreated only. Never MB or pressure-treated.
- Children's items (cots, play furniture): only buy new untreated timber; don't repurpose pallets.
Pallet treatment: common questions
In the UK in 2026, the vast majority of pallets are NOT chemically treated. The dominant treatment, HT (heat treatment under ISPM15), uses only heat. Chemical treatments (methyl bromide, pressure-treatment) are either phased out or extremely rare in modern pallet stock.
Yes, if the pallet is untreated or heat-treated (HT). Both are chemical-free. Avoid methyl bromide-stamped pallets, painted/stained pallets, and pallets that carried chemicals, paints or industrial goods. When in doubt, line the planter with food-grade plastic or landscape fabric.
Look for stamps. MB, pressure-treated or creosoted pallets are usually marked. Visual signs: unusual green, blue or orange tint (pressure treatment), oily or tarry residue (creosote), pungent chemical smell. If in doubt, don't reuse for anything food-adjacent or indoor.
No. Heat treatment uses only heat (56°C core temperature for 30 minutes). It kills pests without any chemical agent, so HT pallets are chemically identical to untreated pallets. They are safe for DIY, furniture, planters and indoor use.
Mostly softwood: Scots pine, European whitewood and Sitka spruce are the dominant timbers. Some heavy-duty pallets use hardwood. All softwood pallets are kiln-dried to 18-20% moisture content during manufacture for dimensional stability and to reduce fungal growth.