The company manufacture a pro-degradant additive (called d2w) which, when added to polyethylene during production, transforms it into an oxo-biodegradable product.
The group imported sodium 2-oxo-3 phenylglycidate, which is not an illegal substance, to use in the manufacture of BMK, which would then be turned into amphetamines.
Symphony Plastics have been supplying oxo-biodegradable plastic bags to Co-operative supermarkets in the UK for five years, and the UK's Periodical Publishers Association recommends that their members use their products.