What do the numbers on the bottom of plastic containers mean?
The Society of the Plastics Industry, Inc. (SPI) introduced a resin identification coding system in 1988. Most municipal recycling programs targeted packaging containers for recycling- the SPI coding system offered a means of identifying the resin content of bottles and containers commonly found in the residential waste stream. The resin code is not a recycle symbol. Recycling firms have varying standards for the plastics they accept. Novato Disposal Service accepts only household containers for recycling.
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