Criteria for a Recommended Standard: Occupational Exposure to Carbon Black

摘要

The term 'carbon black' refers to material consisting of more than 85% elemental carbon in the form of near-spherical colloidal particles and coalesced particle aggregates of colloidal size obtained by partial combustion or thermal decomposition of hydrocarbons. If carbon black contains polycyclic aromatic hydrocarbons (PAH's), ie, if it contains cyclohexane-extractable substances at a concentration greater than 0.1%, 'occupational exposure to carbon black' is defined as any work involving any contact, airborne or otherwise, with this substance. If carbon black contains cyclohexane-extractable substances at a concentration of 0.1% or less, 'occupational exposure to carbon black' is defined as any work involving exposure to carbon black at a concentration greater than half the recommended environmental limit of 3.5 mg/cu m; exposure to this carbon black at lower concentrations will not require adherence to the following sections except 2(a), 3(a), 6(b-e), 7, and 8(a). Exposure to carbon black may occur during the production, processing, distribution, storage, and use of carbon black. If exposure to other chemicals also occurs, provisions of any applicable standard for the other chemicals shall also be followed.