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Rule 1171(Solvent Cleaning
Operations) and Rule 1122 (Solvent
Degreasers) are two key components of the AQMD’s ozone reduction
strategy, as these rules control VOC emissions from numerous uses of solvents
in industrial, commercial, and general purpose cleaning and degreasing
activities. Recent amendments to Rule 1171 and Rule 1122 lowered the VOC content limits of solvents in
several usage categories. Effective January 1, 2003, Rule 1171 and Rule 1122
require cleaning materials used in repair and maintenance operations and cold
cleaners, respectively, to contain no more than 25 grams of VOC per liter of
cleaning solvent as applied. The most common and effective cleaners that meet
this criteria are water-based or aqueous cleaners that contain little or no VOCs, although other options such as VOC exempt compounds
are also available to the user. The low VOC requirement of the rules and the availability of the new
solvents generate a new class of solvent called Clean Air Solvent (CAS). In
order to be qualified, the clean air solvent has to meet all of the following
criteria:
- VOC concentration is no more than 25 grams of VOC per liter of material,
as applied;
- Composite vapor pressure is no more than 5 mm Hg of VOC at 20°C
(68°F);
- Reactivity is not higher than toluene; and,
- Contains no compounds classified as Hazardous Air Pollutants (HAPs) by
the federal Clean Air Act, Ozone-Depleting Compounds (ODCs), or Global Warming Compounds (GWCs).
Manufacturers, suppliers, and users can apply for certification of CASs
that meet the qualifications mentioned above. This certification is valid for
five years and can be renewed upon approval by the AQMD. The certificate
becomes invalid if the material is reformulated or changed such that it does
not meet the qualifications of a CAS. The procedures for compliance with this
provision are outlined in detail under Rule 102 (Definition of Terms),
Rule 301 (Permit Fees), and the
Clean Air Solvent Protocol.
For questions and comments, please mail to Louis Yuhas at lyuhas@aqmd.gov.
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