The Wheaton line of wide mouth plastic containers are ideal for use with powders and solids. The large surface area of these containers makes it easy to label, either on the wide mouth cap or directly on the side of the container. Unlike glass and plastic jars will not break easily when bumped or dropped. This makes these containers an excellent choice for lab or field sampling. Polypropylene (PP) Characteristics: Rigid, solid, durable in container or cap forms. Opaque, natural grayish yellow in natural form. Excellent stress crack and impact resistance. Excellent moisture barrier, good oil and alcohol barrier, poor gas barrier properties. Good chemical resistance. Can be sterilized using ethylene oxide (EtO) or gamma radiation.