9mm PP Screw Top Vial can be made of polypropylene or polymethyl pentene (PMP). Polypropylene is the most popular plastic material. Polypropylene vials have heat resistance of up to 135 degrees Celsius and are commonly used in chromatographic experiments.PMP has higher heat resistance – up to 175 degrees Celsius – and is transparent, which increases the visibility of the sample inside the sample bottle. Plastic vials have good chemical resistance, lightweight construction, durability, and economy.
