When a metal shredder starts, the material enters into the tear box through the feeding system.
The largest scrap metal shredders in the world often have 10,000 horsepower (hp) and are made by a wide range of companies.
[citation needed] One example is the 9,200 hp shredder from the Lynxs group at the Sims plant at the mouth of the River Usk in Newport Wales.
[6] In 2018, the California Department of Toxic Substances Control requested public comment on plans to implement enforceable operating requirements for scrap metal shredders.
[7] In Houston, the carcinogenic substance hexavalent chromium was identified as an emission from a scrap recycling facility.