If certain plastics aren’t recyclable, why do they have a triangle on the bottom with a number in it? A commonly asked question, for sure. Let’s first start with the organization that brought us the solid triangle containing a number to begin with.
“ASTM International, founded as the American Society for Testing and Materials, is a nonprofit organization that develops and publishes approximately 12,000 technical standards, covering the procedures for testing and classification of materials of every sort.” This obviously includes plastics, or resin.
