Section 096-161-6 - Retention Factors and Capture EfficienciesA. For purposes of determining VOC emissions from offset lithographic printing operations, the following retention factors and capture efficiencies shall be used: (1) A portion of the VOCs contained in inks and cleaning solution is retained in the printed web or in the shop towels used for cleaning. The following retention factors shall be used: (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.(2) A portion of the VOCs contained in inks, fountain solutions, and automatic blanket washes on heatset presses is captured in the press dryer for control by add-on pollution control devices. The following capture efficiencies are to be used: (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).06- 096 C.M.R. ch. 161, § 6