Sibata glassware is known throughout Japan and the USA for its high quality, precision laboratory glassware.  These volumetric flasks meet the highest US Federal standards for ASTM E 288 Class A (Lab Grade) volumetric flasks.  Sibata volumetric flasks have the same composition as Pyrex 7740 or Kimble KG-3 

• Machine-blown bodies with heavy beaded, heavy tubing necks, tooled for stoppers. 
• Large, white block letters for easy reading of the labeling 
• Precise volume measurements @ 20° C 
• Sharp and permanent graduation lines 
• Supplied with a 9 ground glass stopper