What Are SPI Codes?

In 1988, the Society of the Plastics Industry (SPI) established a classification system to help people properly recycle and dispose of their plastics. Today, manufacturers follow this coding system and place a number, or SPI code, on each product, usually molded into the bottom.

SPI Code 1

Plastic marked with an SPI code of 1 is made with polyethylene terephthalate. These containers sometimes absorb odors and flavors from foods and drinks that are stored inside them. However, this is still a commonly used plastic for many household items and daily essentials.

SPI Code 2

The SPI code of 2 identifies plastic made with high-density polyethylene. These products are very safe and are not known to leach any chemicals into foods or drinks. Due to the risk of contamination, however, it’s not safe to reuse an HDPE bottle as a food or drink container if it didn’t originally contain some kind of edible substance. In other words, keep the shampoo bottles out of your kitchen cabinet!

SPI Code 3

Plastic labeled with an SPI code of 3 is made with polyvinyl chloride. This kind of plastic should not come in contact with food items as it is a dangerous, toxic chemical. PVC is in many everyday objects, but it’s mostly for industrial use in the plumbing and construction sectors.

SPI Code 4

Plastic marked with an SPI code of 4 is made with low-density polyethylene. This plastic tends to be both durable and flexible. It also does not release harmful chemicals into objects, making it a safe choice for food storage.

SPI Code 5

You’ll find SPI code of 5 on plastic items made with polypropylene. PP can be recycled, but is not as accepted as PETE or HDPE. This type of plastic is strong and can usually withstand higher temperatures. That’s why you’re able to reheat your leftovers in Tupperware without worrying about it melting!

SPI Code 6

Plastic marked with an SPI code of 6 is made with polystyrene. PS can be recycled, but not efficiently; recycling it takes a lot of energy, which means that few places accept it. This is why it’s a good idea to invest in a reusable mug for your daily caffeine fix!

SPI Code 7

The SPI code of 7 is used to designate miscellaneous types of plastic that are not defined by the other six codes. Think of these items as plastics, but ones that don’t conform to society’s rules by fitting into a specific SPI code.