Group 1 Storage Vessels at Existing Affected Sources Producing the Listed Thermoplastics

Thermoplastic Chemical a Vessel capacity (cubic meters) Vapor pressure b (kilopascals) ASA/AMSAN c styrene/acrylonitrile mixture ≥3.78 ≥0.47 acrylonitrile ≥75.7 ≥1.62 Polystyrene, continuous processes all chemicals <75.7 ≥14.2 ≥75.7 ≥1.9 Nitrile c acrylonitrile ≥13.25 ≥1.8 a Vessel capacity and vapor pressure criteria are specific to the listed chemical or to “all chemicals,” as indicated. b Maximum true vapor pressure of total organic HAP at storage temperature. c The applicability criteria in Table 2 of this subpart shall be used for chemicals not specifically listed in this table (i.e., Table 3). [64 FR 11553, Mar. 9, 1999]