250ml Lab Glass Gas Generator with Safety Funnel & Piston Stopper - Customizable Chemistry Equipment for School Labs & Scientific Experiments

Specific physical and chemical properties are as follows: Silicon content: more than 80% Strain temperature: 520 ℃ Annealing temperature: 560 ℃ Softening temperature: 820 ℃ Refractive index: 1.47 Transparency (2mm): 92% Elastic modulus: 67KNmm-2 Tensile strength: 40-120 Nmm-2 Stress optical constants of glass: 3.8xl0-6mm2/N Processing temperature (104dpas): 1220 ℃ Linear Expansion Coefficient: (20-300 ℃) 3.3 x 10-6K-1 Density: 2.23 GCM-1 (20 ℃) Specific heat: 0.9Jg-1K-1 Thermal conductivity: 1.2Wm-1K-1 Water Resistance: (ISO 719) Level 1 Acidic resistance: (ISO 195) Level 1 Alkali Resistance: (ISO 695) Level 2 Usually the product will be sent in 2-5 working days and takes about 3--9 business days to reach you