Metal Free Centrifuge Tubes, 15mL, Sterile, Rack (25 tubes/rack, 20 racks/cs)

For applications requiring the assurance of low background metals Made of 100% medical grade ultra low metal virgin resins Certified below one part per billion (<1ppb) for trace metals Natural colorant-free flat caps Labcon’s  Metal Free® centrifuge tubes are specifically processed to ensure that common trace metals and elements that can interfere with experiments are below an ICP-MS detection level of one part per billion (<1ppb). MetalFree® Special Features Pure, additive-free flat caps for easy labeling Large,  smudge-resistant  writing panel for sample identification Thicker tubes withstand higher g-forces and freeze to -80° without breakage Max Freeze Indicator Accurate, easy-to-read graduations & reverse scale Caps & tubes feature recycling codes Tubes and caps made with virgin, 100% medical grade CFR21 compliant ultra low metal resins Metals included in testing are: Calcium, Magnesium, Zinc, Iron, Copper, Manganese, Aluminum, Silicon, Nickel, Vanadium, Sodium, Phosphorus, Cobalt, Chromium, Potassium, Lithium, and Lead. All package versions are sterilized with a validated and approved ISO 11137 method. Racked tubes are packaged in recyclable fiber racks.