For example, if a 10-gram packaging component is made of 4 grams of plastic, 3 grams of aluminum, and 3 grams of cardboard, all 10 grams will be considered plastic packaging for the purposes of this tax.
Likewise, if the 10-gram packaging component was 3 grams of plastic, 4 grams of aluminum, and 3 grams of cardboard, none of the items would be taxable. If the weight of plastic in the component is equal to the weight of another single material used, the component would not be considered as plastic for this tax.
You will need to be able to demonstrate to HMRC if a packaging component that contains plastic is not subject to the tax because it does not contain more plastic than any other material when measured by weight.