Liquid Handling

Materials: GlassTechnical InformationChemical ResistanceChemical interaction of glass with water and acidsThe chemical interaction of water and acids with glass surfacesis negligibly small; only very small amounts, primarily monovalentions, are dissolved from the glass. This forms a very thin, almostnon-porous layer of silica gel on the glass surface, inhibiting furtherattack. Exceptions are hydrofluoric acid and hot phosphoricacid which prevent the formation of the inert layer.Chemical interaction of glass with alkalisAlkalis attack glass surfaces as concentration and temperaturesincrease. Borosilicate glass 3.3 (Boro 3.3) limits surfaceerosion to the µm range; however, after prolonged exposure,volume changes and/or graduation destruction may occur.0.038HClc(NaOH) = 1 mol/ltime: 1 Std.temperature: 100°Cmg Na 2 O/g glass grain0.030.020.0103 6time (h)layer attack (µm)0.020.010Temperature:100 °CTime: 16 h4 8 12normality of the acidslayer attack (µm)40time (h)3 6Hydrolytic attack on Boro 3.3as a function of timeAcid attack on Boro 3.3as a function of acid concentrationAlkali attack on Boro 3.3as a function of timeHydrolytic resistance ofglass grainsBorosilicate glass 3.3 meets hydrolyticresistance class 1 of DIN ISO719 (98 °C), which is divided into 5hydrolytical resistance classes. Thismeans that when glass grain witha granulation rate of 300-500 µmis exposed to water at 98 °C for1 hour, less than 31 µg Na 2 O pergram of glass grain will be removed.In addition, Borosilicate glass 3.3also meets class 1 of DIN ISO 720(121 °C), which is divided into 3hydrolytical resistance classes. Thismeans that when glass grain is exposedto water at 121 °C for 1 hour,less than 62 µg Na 2 O per gram ofglass grain will be removed.Acid resistanceBorosilicate glass 3.3 meets class1 of DIN 12 116, which is dividedinto 4 acid resistance classes.Borosilicate glass is also calledacid-resistant borosilicate glass, asthe surface erosion after 6 hoursof boiling in 6 N HCl is less than0.7 mg/100 cm 2 . Removal of alkalioxide according to DIN ISO 1776 isless than 100 µg Na 2 O/100 cm 2 .Alkali resistanceBorosilicate glass 3.3 meets class2 of DIN ISO 695, which is dividedin 3 alkali resistance classes.Surface erosion after 3 hours ofboiling in a mixture with equal volumesof sodium hydroxide solution(1 mol/l) and sodium carbonatesolution (0.5 mol/l) is approximately134 mg/100 cm 2 .Chemical resistance to Water DIN ISO 719(HGB Class 1-5)Acids DIN 12 116(Class 1-4)Alkalis DIN ISO 695(Class 1-3)Soda-lime glass (AR-GLAS ® ) 3 1 2Borosilicate glass 3.3 (Boro 3.3) 1 1 2332info@brand.de