16 CFR § 1305.3 - Definitions.
(b) Asbestos means a group of mineral fibers composed of hydrated silicates, oxygen, hydrogen and other elements such as sodium, iron, magnesium and calcium in diverse combinations and are: Amosite, chrysotile, crocidolite, anthophyllite asbestos, actinolite asbestos, and tremolite asbestos.
(c) Free-form asbestos is that which is not bound, woven, or otherwise “locked-in” to a product by resins or other bonding agents, or those from which fibers can readily become airborne with any reasonably foreseeable use.
(d) Emberizing materials means an asbestos-containing material generally packed in an “emberizing” kit to be placed under artificial logs in gas-burning fireplace systems or in artificial fireplaces for decorative purposes. The product is also glued to artificial logs, either at a factory or by a consumer using an emberizing kit. (Synthetic logs manufactured of cellulostic products which are consumed by flames are not included in this definition. Electric artificial logs and artificial ash beds used in electric fireplaces, which do not contain respirable free-form asbestos are not included in this definition.)