Code of Maine Rules
06 - DEPARTMENT OF ENVIRONMENTAL PROTECTION
096 - DEPARTMENT OF ENVIRONMENTAL PROTECTION - GENERAL
Chapter 161 - GRAPHIC ARTS - OFFSET LITHOGRAPHY AND LETTERPRESS PRINTING
Section 096-161-6 - Retention Factors and Capture Efficiencies

(a) A one-hundred percent VOC retention factor for all vegetable ink oils and a twenty percent VOC retention factor shall be used for all other heatset inks printed on absorptive substrates, meaning eighty percent of the VOCs in the ink is emitted during the printing process and is available for capture and control by an add-on pollution control device.

(b) A one-hundred percent VOC retention factor for all vegetable ink oils and a ninety-five percent VOC retention factor shall be used for all other sheet-fed and non-heatset web inks printed on absorptive substrates, meaning five percent of the VOCs in the ink is emitted during the printing process.

(c) A fifty percent VOC retention factor shall be used for cleaning solution VOCs in shop towels for cleaning solutions with a VOC composite vapor pressure of no more than ten mm Hg at twenty degrees Celsius (sixty-eight degrees Fahrenheit) if the contaminated shop towels are kept in closed containers, meaning fifty percent of the VOCs used on the shop towels is emitted during the cleaning process.

(a) A one hundred percent VOC carry over efficiency shall be used for inks. All the VOCs in the ink that is not retained is assumed to be volatilized in the press dryer. Capture efficiency testing for heatset dryers is not required if it is demonstrated that pressure in the dryer is negative relative to the surrounding press room and the airflow is into the dryer.

(b) A seventy percent VOC carry over efficiency shall be used for fountain solutions containing alcohol substitutes.

(c) A forty percent VOC carry over efficiency shall to be used for automatic blanket wash solutions with a VOC composite vapor pressure of no more than ten mm Hg at twenty degrees Celsius (sixty-eight degrees Fahrenheit).