Wide mouth bottles are perfect for sample collection and facilitate rapid filling and emptying of solids, powders, and viscous liquids. The Diamond RealSeal Difference. Medical grade resins to meet demanding requirements. USP Class VI for pharma and research applications. Precision molded for consistent wall thickness and smooth surfaces. Leakproof, linerless caps for secure closing. Value - Laboratory bottle quality and performance with savings associated with economy bottles. Safety & convenience - safe, shatter-resistant alternative to glass bottles.