CH0241D
Schellbach Glass ASTM Graduated Burette with Glass Key Stopcock, 25 ml, 0.10 ml Graduation, Class A

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  • 25 ml Borosilicate ASTM burette
  • Glass key stopcock
  • Single straight bore
  •  Schellbach style, Includes vertical white stripe and center blue ribbon for easy measuring of clear liquids 
  • Class A
  • 0.10 ml blue ceramic graduations
  • Tolerance ±0.05 ml
  • Made from high quality 3.3 borosilicate glass
  • Superior chemical durability*
  • Complies with DIN 12700, ISO 385 and ASTM E1272
*See specifications tab for temperature and chemical durability information
    Material 3.3 Borosilicate Glass
    Class Class A
    Capacity 25 ml
    Graduation 0.10 ml
    Tolerance ±0.05 ml
    Stopcock Glass Key
    Thermal Properties
    Coefficient of Linear Expansion 32.5 x 107 / °C
    Strain Point -515°C
    Annealing Point 565°C
    Softening Point 820°C
    Specific Heat 0.2
    Thermal Conductivity (Cal/cm3°C/Sec) 0.0027
    Chemical Durability
    Contact Chemical (mg/m2) Duration (hours) Loss in weight
    Water distilled at 100°C 6 10
    Water vapour steam at 121°C 1 75
    Acid HCl 6 100
    80% H2SO4 at 130°C 12 140
    Alkali -1N solution of Na2CO3 boiling 6 400
    Isotonic infusion Fluids
    NaCl (0.85%) at 121°C 2.5 70
    Glucose (5%) at 121°C 2.5 50