My sculptures are made in New Zealand out of MDF (Medium Density Fiberboard)

MDF  is a industrial wood product made by combining  hardwood or softwood  fibres with wax and a resin binder, and forming it into panels under high temperature and pressure.

Under The United Nations International Plant Protection Convention,  (Food and Agriculture Organization of the United Nations)  MDF is classified as a category 1 product (Wood products – Reconstituted)  
In accordance with ISPM 32, the category 1 commodities have been processed to the point where they do not remain capable of being infested with quarantine pests. Hence, no phytosanitary measures are required (no requirement of plant import permit) and such a commodity will not be deemed to require phytosanitary certification with respect to pests that may have been present in the commodity before the process.

MDF is exempt of any phytosanitary requirements such as fumigation and no certificates is required for its export or import.

However, some countries may have additional requirements. If any doubts, you should contact an importing agent in your destination country.

I have been exporting these sculptures to all 5 continents since 2014 and have never been asked for a phytosanitary certificate or any similar documentation.