Safety storage bottle, 50mL, epoxy coated, no plug
Heavy wall glass storage bottles with #15 Ace-Thred are intended only for storage of low-boiling liquids at room temps or at not less than -20°C. Designed to resist internal pressures up to 100 psi, as low as -20°C. The low pressure rating based primarily on the rating for PTFE T.F.E. Epoxy coated to the neck to help prevent shattering and reduce spills.