Whole-air sampling device for VOCs and permanent gases. Several EPA, NIOSH, and OSHA methods exist for bag sampling for a variety of applications: stationary sources emissions; workplace atmospheres; ambient, indoor air quality, greenhouse gas, and breath analysis. Pre-clean bag before use by flushing with high purity nitrogen. Do not fill more than 80%. Recommended sample hold time is 48 hours. Physical Specifications: Composition: polyvinyl fluoride (PVF) polymer resin, Thickness: 0.002", Tensile Strength: 8,000 psi, Max. Operating Temp.: 82 °C (180 °F), Specific Gravity: 1.7 g/mL, Oxygen Permeability: 50 cc/m2/day, Water Vapor Permeability: 9–57 g/m2/day, Carbon Dioxide Permeability: 172 cc/m2/day.