Coating VOC vs. Material VOC

From the MACLAC Guide to Paint VOC Definitions:

"'Material' VOC is calculated on the entire volume of the coating. It is the ratio of weight of non-exempt solvent VOC to the entire volume

'Coating' V.O.C. is the ratio of weight of nonexempt solvent VOC to the remaining volume (after subtracting the exempt solvents & water). This is the VOC that air quality districts use to determine whether or not a paint is in compliance with the limits set by a rule."

From the BC+C Reference Guide Table 1 IEQc4.2 Applicable VOC Limits:
"VOC Limit (g/L minus water)"

You should compare the "coating VOC" to the Applicable VOC Limits in the Reference Guide.

This is correct. The only time 'Material VOC' would apply in SCAQMD Rule 1113 as referenced would be with the Low Solids Coatings category. This category is defined as having less than 1 pound per gallon solids content. The latest CARB and SCAQMD inventories and assessments indicate that all of the regulated products are water carried.

One correction to the Reference Guide table for Rule 1113 2004: The Reference Guide erroneously lists the Low Solids category limit in ppb units. The category limit is 120 g/L.

The IEQ TAG will attempt to address contradictory and/or confusing interpretations in the near future.