Pharmaceutical glass(neutral glass tube)(A) Glass Tubing Physical DataNo.Physics PerformanceNumerical ValueUnit1coefficient of mean linear thermal expansion (20;300) 7.00.110-6 K-12Transformation Temperature 550153softening point 750104working point 1110205Density at20 2.460.02g/cm3 Chemical Composition in approximate weight % (main components) SiO2 B2O3 Na2O BaO CaO Al2O3 70 6.6 11 <2 <3 6.2 Chemical Data: Hydrolytic resistance, accordingto ISO720 1 to European Pharmacopoeia 1 to USP23 1 Acid resistance Class(DIN 12116) 1 Alkali resistance Class(ISO 695) 2