Falcon 15mL Conical Tubes Features: IMPORTANT CHANGE: Due to a Blue Dye shortage, Falcon Tubes will temporarily have a clear color cap. Read More Here RNA/DNase free Solvent-resistant white writing area for writing directly on tube Sterilized by gamma irradiation, nonpyrogenic Supplied blue HDPE 20mm threaded dome seal closures provide positive seal over the full circumference Polystyrene 15ml Optically clear for easy viewing of sample Dark blue graduations in 0.5mL increments are visible with clear or turbid samples Stable from 4° to 60°C (39° to 140°F) Withstand centrifugal forces up to 1,800 x g RCF Clarified Polypropylene 15ml Resistant to alcohols and mild organic solvents Dark blue graduations in 0.5mL increments are visible with clear or turbid samples Translucent wall for easy viewing Stable from -80° to +121°C Withstand centrifugal forces to 12,000 x g RCF Lot Number Lookup To look up a lot number for a Falcon item, click the above link and enter your Product Number and Lot number under the Quality Certificate Lookup. Specifications: Mfr. No. 352095 Polystyrene w / Screw Cap Conical Centrifuge Tubes 15 mL (500/case) (Optional MEA Tested) Mfr. No. 352099 Polystyrene w / Screw Cap and Rack Conical Centrifuge Tubes 15 mL (500/case) (Optional MEA Tested) - Mfr. No. 352196 High-Clarity Polypropylene w / Screw Cap (Includes 1 Rack) Conical Centrifuge Tube, 15 mL (500/case) (Optional MEA Tested) Mfr. No. 352097 High-Clarity Polypropylene w / Screw Cap And Rack Conical Centrifuge Tubes 15 mL (500/case) (Optional MEA Tested) - IN STOCK Mfr. No 352096 High Clarity PP Centrifuge Tube, Conical Bottom, with Dome Seal Screw Cap, Sterile, 15mL (50/Bag; 500/Case)