Apple has banned two chemicals from being used in the final stages of manufacturing its devices following pressure from activist groups and an investigation at 22 factories. The two chemicals in question are benzene and n-hexane, which manufacturers use as a cleaning and solvent agent respectively. In March, China Labor Watch and Green America began pressuring Apple to stop using the chemicals, arguing that alternatives were available. Apple proceeded to conduct its own investigation into the use of the two chemicals at the 22 factories, reports the Associated Press.