Borosilicate 3.3 Glass, Heat and Thermal Shock Resistant 50/100/250/500/1000ml flask with standard uniform wall 2000/3000/5000ml flask with advance uniform wall, slightly thicker White graduation markings, white note writing display SGS UK tested, all Rocwing glassware including beakers, flasks and cylinders in compliance with BS 6748:1986 (Food Contact Safe)
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