Glass vials are essential for the collection and storage of small specimens and those stored in alcohol. Screw cap vials are made of borosilicate glass tubing, and are annealed in special retempering ovens to eliminate internal strains and assure full mechanical strength.
Polyseal Caps have an interior polyethylene liner which projects into the mouth of the vial and provides a double seal when screwed tightly. This liner virtually eliminates evaporation of alcohol in vials, thus reducing time required for collection maintenance.
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