Kimble-Chase-Erlenmeyer-Narrow-Neck-Flasks-Kimble-Chase-66500-500-p-This-Kimble-Chase-Erlenmeyer-Flask-has-a-low-coefficient-of-expansion-to-resist-thermal-shock-It-is-made-from-borosilicate-glass-&-has-sturdy-walls-to-minimize-mechanical-breakage-p-Kimble-Chase-Erlenmeyer-Flask-Narrow-Neck-500ml