Class B Borosilicate Glass Burette with PTFE Stopcock, Blue Graduations

• Material: 3.3 Borosilicate Glass
• Class: Class B
• Capacity: 50 ml
• Graduation: 0.1 ml
• Tolerance: ±0.1 ml
• Stopcock: PTFE
• Thermal Properties

Coefficient of Linear Expansion: 32.5 x 10⁻⁷ / 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: Duration (hours)

Loss in weight (mg/m²)

• 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

4000

• Isotonic infusion Fluids

NaCl (0.85%) at 121°C: 2.5

70

Glucose (5%) at 121°C

2.5

50

• Dimensions (L × W × H): 36.00" × 4.00" × 4.00" (91.4cm × 10.2cm × 10.2cm)
• Weight: 1.00 lbs (454g)