We can find one sign on the plastic bottles or plastic bags. It appears to be one number in little strangle. In fact, this symbol indicates the type of plastic used in manufacturing and whether it can be recycled easily. Each number inside the signs is a code for a specific family of plastics or resins. Not all plastics are recyclable.

Common types of plastics material
Soda and milk bottles, for example, are made from polyethylene terephthalate (PET or PETE); polypropylene (PP) is generally used in yogurt containers and catsup bottles. Harder, durable polymers are used in the manufacturing of construction materials, such as polyvinyl chloride (PVC) pipes.

Recycling Codes to material
Each number inside the recycling symbol represents a type of plastic. The most commonly recycled plastics display either a #1 PET or PETE (for example, single-use bottles for water and soda) or a #2 HDPE (high density polyethylene used in milk bottles and laundry detergent jugs). Recycling code #3 PVC (polyvinyl chloride) is rarely recycled.

Where to Recycle
Many communities offer a recycling program through the county or municipal solid waste department. Many offer curbside recycling for a variety of plastics. Some communities provide recycling centers and bins at designated locations or at the local solid waste management facility, and accept a wider range of recyclable plastics.