# 61.31 Definitions.
Terms used in this subpart are defined in the act, in subpart A of this part, or in this section as follows:
(a) *Beryllium* means the element beryllium. Where weights or concentrations are specified, such weights or concentrations apply to beryllium only, excluding the weight or concentration of any associated elements.
(b) *Extraction plant* means a facility chemically processing beryllium ore to beryllium metal, alloy, or oxide, or performing any of the intermediate steps in these processes.
(c) *Beryllium ore* means any naturally occurring material mined or gathered for its beryllium content.
(d) *Machine shop* means a facility performing cutting, grinding, turning, honing, milling, deburring, lapping, electrochemical machining, etching, or other similar operations.
(e) *Ceramic plant* means a manufacturing plant producing ceramic items.
(f) *Foundry* means a facility engaged in the melting or casting of beryllium metal or alloy.
(g) *Beryllium-containing waste* means material contaminated with beryllium and/or beryllium compounds used or generated during any process or operation performed by a source subject to this subpart.
(h) *Incinerator* means any furnace used in the process of burning waste for the primary purpose of reducing the volume of the waste by removing combustible matter.
(i) *Propellant* means a fuel and oxidizer physically or chemically combined which undergoes combustion to provide rocket propulsion.
(j) *Beryllium alloy* means any metal to which beryllium has been added in order to increase its beryllium content and which contains more than 0.1 percent beryllium by weight.
(k) *Propellant plant* means any facility engaged in the mixing, casting, or machining of propellant.