Wheaton wide mouth blake packers are manufactured from high density polyethylene.

High Density Polyethylene (HDPE) Characteristics: Flexible but more rigid than LDPE. Natural color is milky white, semi-translucent depending on density. White HDPE helps protect light sensitive samples. Good impact strength and stress crack resistance. Good chemical resistance. Good vapor barrier but poor gas barrier. Can be sterilized using ethylene oxide (EtO) or gamma radiation.

The wide mouth is ideal for solid samples. Pre-attached white polypropylene screw cap with foamed polyethylene liner provides cleanliness. Blake design maximizes storage space.