The chemistry of industrial glasses is made from multiple oxide components, obtained from a variety of natural minerals which have been beneficiated to consistent physical properties and chemistries. This paper reviews certain so-called "Heavy Metals", which are often incorporated into glass; and why glass producers need to understand variables within their manufacturing practices which may relate to a variety of environmental regulations. The paper is not intended to be an authoritative source for all current regulations pertaining to certain heavy metals, or to recommend any specific environmental monitoring or operating practices which may be required to meet both present and future compliance requirements, Rather, it provides a reminder to industrial glass producers that many metals and metal compounds used in a variety of industrial glass products may be of concern, and that further educational efforts on the issues presented may be required.
