What happens if wooden half pallets cross an international border without the ISPM 15 HT mark?

Wooden EUR 6 half pallets without the ISPM 15 HT (heat-treated) mark face quarantine, rejection, or destruction at international border controls. The ISPM 15 standard applies to all wooden packaging material in international trade — pallet size does not reduce the compliance obligation. Border agencies enforce the HT mark requirement at EU external borders and UK customs inspection points on wooden pallets of every format and dimension. A consignment carried on non-compliant wooden half pallets is non-compliant regardless of the goods or total consignment value. Shippers using wooden half pallets for cross-border EU or UK deliveries must verify the HT mark on every pallet before the vehicle departs.