Graduated Glass Erlenmeyer Flask 250ML
Erlenmeyer Flasks-Narrow Mouth, Low Form, Heavy-Duty Rim, Graduated
Chemical Composition: Glassware is manufactured from low-expansion Type 1, Class A Borosilicate 3.3 glass that complies with ASTM E438 Standard Specification for Glasses in Laboratory Apparatus. It is low alkali glass with a typical chemical composition of approximately 81% silica, 13% boric oxide, 4% sodium oxide, and 2% aluminum oxide. It is virtually free of magnesia-lime-zinc group.
Thermal Properties: Borosilicate glass has a low coefficient of thermal expansion. Therefore, the thermal stresses under a given temperature gradient are low, and the glass can withstand higher temperature gradients as well as sudden temperature changes / thermal shocks. However, even minute scratching of glass surface can reduce its thermal resistance. The 'Strain Point' (about 500°C) is generally recommended as the maximum safe operating temperature for glassware. The glass may acquire permanent stresses upon cooling if it is heated above 500°C. Glassware is annealed in modern ovens under strictly controlled conditions to ensure minimal residual stress.
Chemical Durability: Glassware is highly resistant to water, neutral and acid solutions, concentrated acids and their mixtures, as well as to chloride, bromine, iodine, and organic matters. Even during extended period of reaction and at temperatures above 100°C, its chemical resistance exceeds that of most metals and other materials. Glassware can withstand repeated dry and wet sterilization and offers good resistance against various chemicals, except for hydrofluoric acid, hot phosphoric acid and alkaline solutions.
Optical Properties: Glassware has a clear and colorless appearance and shows no noticeable absorption in the visible region of the spectrum.
Safety: Treated with proper care, glassware will offer long-term, reliable service in the laboratory.
Rubber Stopper Size: 6
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