HAP ABA
HAP ABA means methylene chloride, or any other HAP compound used as an auxiliary blowing agent.
Source
40 CFR § 63.1292
Scoping language
All terms used in this subpart shall have the meaning given them in the Act, in subpart A of this part, and in this section. If a term is defined in subpart A and in this section, it shall have the meaning given in this section for purposes of this subpart.