40 C.F.R. § 751.103
The definitions in subpart A of this part apply to this subpart unless otherwise specified in this section. In addition, the following definitions apply:
Consumer paint and coating removal means paint and coating removal performed by any natural person who uses a paint and coating removal product for any personal use without receiving remuneration or other form of payment.
Distribution in commerce has the same meaning as in section 3 of the Act, except that the term does not include retailers for purposes of §§ 751.111 and 751.113.
ECEL is an Existing Chemical Exposure Limit, and means an airborne concentration calculated as an eight (8)-hour time-weighted average (TWA).
ECEL action level means a concentration of airborne methylene chloride of 1 part per million (1 ppm) calculated as an 8-hour time weighted average (TWA).
EPA STEL is a Short Term Exposure Limit, which is an EPA regulatory limit on workplace exposure to an airborne concentration of a chemical substance, based on an exposure of less than eight hours.
Paint and coating removal means application of a chemical or use of another method to remove, loosen, or deteriorate any paint, varnish, lacquer, graffiti, surface protectants, or other coating from a substrate, including objects, vehicles, architectural features, or structures.
Retailer means a person who distributes in commerce or makes available a chemical substance or mixture to consumer end users, including e-commerce internet sales or distribution. Any distributor with at least one consumer end user customer is considered a retailer. A person who distributes in commerce or makes available a chemical substance or mixture solely to commercial or industrial end users or solely to commercial or industrial businesses is not considered a retailer.
40 C.F.R. §751.103