They're called Resin Identification Codes. Follow BI Video: On Twitter More from Science Ever wonder what those small numbers on the bottom of your plastic bottles and takeout containers mean?

there are seven different types of plastic that are identified using a resin identification code (RIC). Only two kinds of plastic (#1 PET, or Polyethylene Terephthalate, and #2 HDPE, or High ...

ASTM committee on additive manufacturing technologies is developing a standard-guide for mechanical testing of plastics used in AM. Additional changes could be coming for the Resin Identification ...