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Black Glass 2.60

Black Glass 2.60

Material: lead free crystal
ROHS & REACH compliant

Physical properties density 2.54-2.66 g/cm3
  color black, not see through
  composition SiO2 70%
    Na2O + K2O 19%
    Others CaO MgO Al2O3
    MnO Cr2O3 Fe2O3
  max working temperature 300 C
     
Thermal properties strain point 503C
  softening point 591 C
     
Mechanical properties hardness 619 kg/cm2 
  youngs modulus 6.6 105 kg/cm2
  compressive strength 9250 kg/cm2 
  tensile strength 824 kg/cm2