Understanding different types of plastics is crucial when making decisions on items for your family and home. Recycling numbers, ranging 1 through 7, are used to specify what type of plastic is contained in an item and in turn how that item may be recycled. They are found inside an M.C. Escher style triangle of arrows turned in on themselves on the bottom of most plastic containers. Of the seven different types of plastic available on the American market, all are based on a different resin. Each of these seven varies in both its effect on environmental safety and ease of recycling. What follows is a general outline of most types of plastics along with their most common uses.
PLASTIC #1: POLYETHYLENE TEREPHTHALATE (PET OR PETE)
Common uses: 2 liter soda bottles, single use water bottle containers, cooking oil bottles, peanut butter jars.
This is the most widely recycled plastic. Commonly recycled, PET is semi-rigid and very lightweight. It’s best suited for single-use containers as it can break down when exposed to light and heat, causing it to leach. PET can also be recycled into fabric, similar in strength and appearance to virgin nylon.
PLASTIC #2: HIGH DENSITY POLYETHYLENE (HDPE)
Common uses: detergent bottles, milk jugs.
HDPE is a sturdy and reliable non-leaching translucent plastic. HDPE resists UV penetration, which can damage and discolor the plastic. Dishwasher-safe and able to withstand temperatures from -148 to 176° F (-100 to 80° C), it’s ideal for food and beverage storage.
PLASTIC #3: POLYVINYL CHLORIDE (PVC)
Common uses: plastic pipes, outdoor furniture, shrink wrap, water bottles, salad dressing and liquid detergent containers.
Most PVC vinyl products contain phthalates, which mimic human hormones and also affect various life forms including fish and invertebrates adversely. For this reason, we do not recommend products made from PVC for food storage.
PLASTIC #4: LOW DENSITY POLYETHYLENE (LDPE)
Common uses: dry cleaning bags, produce bags, trash can liners, food storage containers.
LDPE are safe, non-leaching plastics. Flexible, impact-resistant and microwave-proof, it’s dishwasher-safe and able to withstand temperatures from -148 to 176° F (-100 to 80° C). Safe for use with food and beverages.
PLASTIC #5: POLYPROPYLENE (PP)
Common uses: bottle caps, food containers, drinking straws.
BPA-free, polypropylene is commonly used for injection molding. It’s resistance to high heat generally makes it microwave and dishwasher safe, as well as a good option for food and beverage storage.
PLASTIC #6: POLYSTYRENE (PS)
Common uses: packaging pellets or “Styrofoam peanuts,” cups, plastic tableware, meat trays, to-go “clam shell” containers.
Polystyrene foam is a major component of plastic debris in the ocean, where it becomes toxic to marine life. Currently, the majority of polystyrene products are not recycled. This material should be avoided.
PLASTIC #7: OTHER
Common uses: LEXAN, certain kinds of food containers and Tupperware.
This plastic category includes any plastic other than the above named types. These containers can be any of the several different types of plastic polymers.
Polycarbonate is the most commonly-known #7 plastic. Proven to leach BPA, it is not recommended for food storage. Not all “other” plastic is polycarbonate, however. Plastics labeled #7 can also be a combination of several safe plastics. You should engage in due-diligence when making decisions about #7 plastics.
