Society of the Plastics Industry

Founded in 1937, The Society of the Plastics Industry Inc. is the trade association representing one of the largest manufacturing industries in the United States. SPI's members represent the entire plastics industry supply chain, including processors, machinery and equipment manufacturers and raw materials suppliers. The U.S. plastics industry employs 1.4 million workers and provides more than $310 billion in annual shipments.

Additional recommended knowledge

Daily Visual Balance Check

What is the Correct Way to Check Repeatability in Balances?

Safe Weighing Range Ensures Accurate Results

The SPI introduced its Resin identification coding system in 1988 at the urging of recyclers around the country. This system was introduced to make separation of the many similar-appearing plastic resin types easier for recycling centers across the country. There was no federal legislation or program to mandate these symbols, though many states have now adopted legislation that mandate its use.

See also

William R. Carteaux