The Society of the Plastics Industry, Inc. (SPI) introduced its resin identification coding system in 1988 at the urging of recyclers around the United States of America. A growing number of communities were implementing recycling programs in an effort to decrease the volume of waste subject to tipping fees at landfills. In some cases, these programs wre driven by state-level recycling mandates. the SPI code was developed to meet recyclers' needs while providing manufacturers a consistent, uniform system that could apply nationwide. Because municipal recycling programs traditionally targeted packaging - primarily containers - the SPI coding system offered a means of identifying the resin content of bottles and containers commonly found in the residential waste stream. Recycling firms have varying standards for the plastics they accept. Some firms may require that the plastics be sorted by type and separated by other recyclables; some may specify that mixed plastics are acceptable if they are separated from other recyclables; while others may accept all material mixed together. Not all types of plastics are generally recycled, and recycling facilities may not be available in some areas.
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|POLYETHYLENE TEREPHTHALATE||(PET or PETE)|
|HIGH DENSITY POLYETHYLENE||(HDPE)|
|LOW DENSITY POLYETHYLENE||(LDPE)|