| Term | Definition |
| bimetal | made of two types of metal |
| closed-loop recycling | taking an old product and turn it into a new product of the same kind |
| heat conductivity | ability of a substance to conduct heat |
| manufactured packaging | packaging made by people or machines |
| natural packaging | packaging made by nature |
| precycling | process of using less material to make a product fo the same volume and quality |
| post-consumer content | items made with recycled materials from the consumer solid waste |
| recycled content | amount of recycled material in a product |