Resin Recycling Numbers

Below is a list of different types of plastics:

#1: Polyethylene terephthalate (soft drink bottles)
#2: High-density polyethylene (bottles, grocery bags, milk jugs)
#3: Polyvinyl chloride (pipe, curtains, lawn chairs, non food bottles)
#4: Low-density polyethylene (plastic bags, wash bottles, tubing, various molded laboratory equipment)
#5: Polypropylene (auto parts, food containers, dishware)
#6: Polystyrene (clamshell containers, packaging peanuts, styrofoam)
#7: Other plastics including acrylic, nylon, polycarbonate, and polylactic acid (bottles, plastic lumber, headlight lenses, safety glasses/shields)
#9: ABS-acrylonitrile, butadiene, styrene (high-impact and chemical resistant extruded or molded objects)

Source: Wikipedia Resin Identification Codes