24PK Test Tubes, 25mL, 18x150mm - Rimless - Light Wall, 1.2mm Thick - Marking Spot - Borosilicate Glass

Thermal Properties

• Strain Point: 515°C
• Annealing Point: 565°C
• Softening Point: 820°C
• Coefficient of Linear Expansion: 32.5 x 10^-7 / °C
• Specific Heat: 0.2
• Thermal Conductivity (Cal/cm³°C/Sec): 0.0027

Chemical Durability - Contact

• Water distilled at 100°C: 6 hours - 10 mg/m² lost
• Water vapour steam at 121°C: 1 hour - 75 mg/m² lost
• Acid HCl: 6 hours - 100 mg/m² lost
• 80% H₂SO₄ at 130°C: 12 hours - 140 mg/m² lost
• Alkali -1N solution of Na₂CO₃ boiling: 6 hours - 4000 mg/m² lost

Chemical Durability - Isotonic Infusion Fluids

• NaCl (0.85%) at 121°C: 2.5 hours - 70 mg/m² lost
• Glucose (5%) at 121°C: 2.5 hours - 50 mg/m² lost

Started over 50 years ago as a small, family-owned manufacturing company, Eisco now produces over 6,500 product lines for the science education and scientific research markets. They have headquarters in both India and the US, and serve hundreds of distributors around the world.

Their core products include glassware, physics apparatus, biology models & equipment, and chemistry lab supplies. Products are designed by a team of laboratory professionals and engineers with quality and durability in mind.