For pharmaceutical or similar packaging of liquid or dry materials. Polypropylene bottles are Boston-round style, clear, and moulded from FDA compliant material. Polypropylene caps have a valve-seal design for a leakproof fit. Deep, square threads help prevent back-off during shipping. Ribbed cap exteriors are designed for torque closure and easy opening. Smooth, rounded bottle interiors are designed for easy cleaning and thorough emptying. Autoclavable, with caps detached, to 121 °C (250 °F).