Flask, 4000ml, Narrow Neck, with Rim, Borosilicate Glass, Lincon, 1/Box

These flasks have long necks with tooled mouths and take a matching size rubber stopper. Wall thicknesses are carefully controlled to provide the proper balance between thermal expansion and mechanical strength for greater shock resistance. Their excellent chemical durability results in contamination-free results and long life under the toughest lab conditions.