Accoya® wood is produced from sustainably sourced, fast growing wood and manufactured using Accsys’ proprietary patented modi ... fication process from surface to core. Accoya® wood has been thoroughly tested for dimensional stability, durability, paint retention and in-ground conditions to ensure optimal performance. Indeed, it is so reliable that for many years it has been – and continues to be – used by scientists as the benchmark against which other treatments and modifications are measured. read more