{"data":{"id":"us/40-cfr-60.581","jurisdiction":"us","citation":"40 CFR 60.581","heading":"Definitions and symbols.","body":"(a) All terms used in this subpart, not defined below, are given the same meaning as in the Act or in subpart A of this part.\nEmission control device means any solvent recovery or solvent destruction device used to control volatile organic compounds (VOC) emissions from flexible vinyl and urethane rotogravure printing lines.\nEmission control system means the combination of an emission control device and a vapor capture system for the purpose of reducing VOC emissions from flexible vinyl and urethane rotogravure printing lines.\nFlexible vinyl and urethane products mean those products, except for resilient floor coverings (1977 Standard Industry Code 3996) and flexible packaging, that are more than 50 micrometers (0.002 inches) thick, and that consist of or contain a vinyl or urethane sheet or a vinyl or urethane coated web.\nGravure cylinder means a plated cylinder with a printing image consisting of minute cells or indentations, specifically engraved or etched into the cylinder's surface to hold ink when continuously revolved through a fountain of ink.\nInk means any mixture of ink, coating solids, organic solvents including dilution solvent, and water that is applied to the web of flexible vinyl or urethane on a rotogravure printing line.\nInk solids means the solids content of an ink as determined by Method 24, ink manufacturer's formulation data, or plant blending records.\nInventory system means a method of physically accounting for the quantity of ink, solvent, and solids used at one or more affected facilities during a time period. The system is based on plant purchase or inventory records.\nPlant blending records means those records which document the weight fraction of organic solvents and solids used in the formulation or preparation of inks at the vinyl or urethane printing plant where they are used.\nRotogravure print station means any device designed to print or coat inks on one side of a continuous web or substrate using the intaglio printing process with a gravure cylinder.\nRotogravure printing line means any number of rotogravure print stations and associated dryers capable of printing or coating simultaneously on the same continuous vinyl or urethane web or substrate, which is fed from a continuous roll.\nVapor capture system means any device or combination of devices designed to contain, collect, and route organic solvent vapors emitted from the flexible vinyl or urethane rotogravure printing line.\n(b) All symbols used in this subpart not defined below are given the same meaning as in the Act or in subpart A of this part.\na = the gas stream vents exiting the emission control device.\nbthe gas stream vents entering the emission control device.\nfthe gas stream vents which are not directed to an emission control device.\nCaj = the concentration of VOC in each gas stream (j) for the time period exiting the emission control device, in parts per million by volume.\nCbi = the concentration of VOC in each gas stream (i) for the time period entering the emission control device, in parts per million by volume.\nCfk = the concentration of VOC in each gas stream (k) for the time period which is not directed to an emission control device, in parts per million by volume.\nGthe weighted average mass of VOC per mass of ink solids applied, in kilograms per kilogram.\nMci = the total mass of each ink (i) applied in the time period as determined from plant records, in kilograms.\nMdj = the total mass of each dilution solvent (j) added at the print line in the time period determined from plant records, in kilograms.\nQaj = the volumetric flow rate of each effluent gas stream (j) exiting the emission control device, in standard cubic meters per hour.\nQbi = the volumetric flow rate of each effluent gas stream (i) entering the emission control device, in standard cubic meters per hour.\nQfk = the volumetric flow rate of each effluent gas stream (k) not directed to an emission control device, in standard cubic meters per hour.\nEthe VOC emission reduction efficiency (as a fraction) of the emission control device during performance testing.\nFthe VOC emission capture efficiency (as a fraction) of the vapor capture system during performance testing.\nWoi = the weight fraction of VOC in each ink (i) used in the time period as determined from Method 24, manufacturer's formulation data, or plant blending records, in kilograms per kilogram.\nWsi”means the weight fraction of solids in each ink (i) used in the time period as determined from Method 24, manufacturer's formulation data, or plant blending records, in kilograms per kilogram.\nWoj = the weight fraction of VOC in each dilution solvent (j) added at the print line in the time period determined from Method 24, manufacturer's formulation data, or plant blending records, in kilograms per kilogram.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 60—STANDARDS OF PERFORMANCE FOR NEW STATIONARY SOURCES","Subpart FFF—Standards of Performance for Flexible Vinyl and Urethane Coating and Printing"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"b5dd14829162d2518e1c0ec60774c2a3e7307dd30d3285b9e14f6144aa2a6826","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-60.580","next":"us/40-cfr-60.582"},"notice":"GroundRules: Original legal text. Not legal advice."}