The ISRI Scrap Specifications Circular is the definitive classification system for scrap metals in North America. Originally published by the Institute of Scrap Recycling Industries (now the Recycled Materials Association, or ReMA), it assigns word-based code names to non-ferrous grades and numeric codes to ferrous grades. Any software system that handles scrap metal trading, pricing, or inventory must understand this system.
How the Coding System Works
Non-ferrous grades use English word code names. These are not acronyms or abbreviations. They are assigned words meant to be easily communicated verbally and distinguishable on noisy trading floors and scrapyard operations. For example, Bare Bright copper wire is BARLEY, not an abbreviation for anything.
Ferrous grades use numeric codes organized by category. The 200 series covers Heavy Melting Steel. The 207 code designates Busheling. The 210-211 range covers shredded scrap. Each number corresponds to specific thickness, size, and composition requirements.
Key Non-Ferrous Codes
For copper, the most commonly traded codes are BARLEY (Bare Bright wire), CANDY (#1 copper tubing), BIRCH (#2 copper), and DRUID (insulated copper wire). The price spread between BARLEY and BIRCH can be $0.30 to $0.80 per pound, so correct classification directly impacts valuation.
Aluminum codes include TALC (used beverage cans), TATA (6063 extrusions), TRUMP (old cast aluminum), and TABLET (old aluminum sheet). Mixed aluminum loads classified as TENSE (mixed low-copper aluminum) trade at significant discounts to segregated grades.
Brass codes include HONEY (yellow brass) and EBONY (red brass). The distinction matters because red brass contains 80-85% copper versus 60-70% for yellow brass, creating a meaningful price premium.
Ferrous Codes
The ferrous numbering system starts with HMS grades in the 200 series. HMS 1 covers specifications 200 through 206, varying by maximum piece size. HMS 2 specifications 203 through 205 permit lighter gauge material. Specification 207 is Busheling, the premium factory scrap grade.
Shredded scrap (210-211) deserves special attention because it is the fastest-growing ferrous scrap category. Auto shredders produce millions of tons annually, and the homogeneous nature of shredded scrap makes it easy to price and trade.
Implementing ISRI Codes in Software
When building a system that handles scrap grades, store both the ISRI code and a human-readable name. Use the ISRI code as the canonical identifier for API calls, database keys, and cross-system communication. Display the human-readable name in user interfaces.
The ScrapMetal API uses ISRI codes in every price response, making it straightforward to join price data with your inventory or order management system. Query the /v1/grades endpoint to get a full list of supported codes with their descriptions and metal categories.