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Plastic resin codes identify the type of plastic the product is made of. The resin codes below are typical for the types of containers listed. (Check yours.)
Just don't assume that a resin code means that a container will get recycled. Most plastic ends up in a landfill. Plastics are numbered with resin codes 1 through 7, but there are really only recycling markets for 1 and 2. Some communities have markets for 5, but very few.
Plastic resin identification codes
Peanut butter jars
Laundry detergent containers
Auto product bottles
Plastic grocery bags
Amber-colored pill bottles
Coffee cup lids
Styrofoam egg cartons
Adapted from Conway, Arkansas, Department of Sanitation.