http://cdn2.hubspot.net/hub/159220/file-18393937-pdf/docs/raw_materials_failure.pdf?t=1421649211293

http://c.ymcdn.com/sites/www.casss.org/resource/resmgr/imported/WCBPCMC09CordobaRodriguezSlides.pdf

Many raw materials suppliers do only a fraction of their business with pharmaceutical, personal care products or cosmetics companies. A raw material thus may have multiple uses. Consequently specifications may be set to ensure consistency of the material from lot to lot. However, the specification boundaries set by a particular supplier, although consistent, can be much wider than those acceptable for GMP manufacturing purposes.