Mininert ® valves are highly dependable, leak-tight closures for screw top vials, crimp top vials, and other laboratory containers. Precleaned Vials Our precleaned, Type 1 borosilicate clear or amber glass vials are washed in non-phosphate detergent, rinsed three times with tap water, and rinsed with ASTM Type-1 organic-free water to remove