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Recycling codes are used to identify the materials out of which the item is made, to facilitate easier recycling process. The presence on an item of a recycling code, a chasing arrows logo, or a resin code , is not an automatic indicator that a material is recyclable; it is an explanation of what the item is made of.
Resin code for polyethylene terephthalate Polypropylene lid of a Tic Tac box, with a living hinge and the resin identification code, 5, under its flap. The Resin Identification Code (RIC) is a technical standard with a set of symbols appearing on plastic products that identify the plastic resin out of which the product is made. [1]
Polycarbonate is commonly used in eye protection, as well as in other projectile-resistant viewing and lighting applications that would normally indicate the use of glass, but require much higher impact-resistance. Polycarbonate lenses also protect the eye from UV light.
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Polycarbonates do not have a unique resin identification code. Items made from polycarbonate can contain the precursor monomer bisphenol A (BPA). Susceptible to UV light, exposure results in yellowing (degradation is especially visible in headlamps that lost or didn't have proper protective coating).
Demand for plastic resins in Europe during 2017 as a percentage of total plastic demand. [1] A comparison of standard plastics, engineering plastics, and high-performance plastics
The article says ABS has code number 9, but I could not verify it. Further a book named Handbook of Plastic Recycling by rapra technology (first published in 2002, ISBN:1-85957-325-8) gives it a code number of 7 itself. The text assigns 7 to PMMA, PC, Nylon 6 and, as discussed, ABS ···V ani s che nu 「m / Talk」 15:44, 9 September 2012 (UTC)
MIL-STD-130, "Identification Marking of U.S. Military Property," is a specification that describes markings required on items sold to the Department of Defense (DoD), including the addition, in about 2005, of UII (unique item identifier) Data Matrix machine-readable information (MRI) requirements.