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borosilicate glass tubing

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    Feb 15,2009

  • Date Posted:

    Feb 16,2008

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I AM FROM INDIA MUMBAI MY COTACT DETAIL ARE +919833719990 The tube which we say is the Borosilicate glass tube with following chemical and physical composition. Borosilicate glass is chosen for its unique chemical and physical properties. Borosilicate glass can be considered as being composed of oxides. Silica (SiO2) Magnesia (MgO) and lead oxide (PbO) are the principle modifiers/fluxes. The chemical and physical properties of any glass depends on a varying degree on chemical composition of glass. CHEMICAL COMPOSITION The composition of borosilicate glass used for chemical plants has following approximate composion. SiO2 - 80.6% B2 O2 - 12.5% Na2O - 4.2% Al2O3 - 2.2% RESISTANCE TO CHEMICAL Borosilicate glass is inert to almost all materials except hydroflouric acid (HF) phosphoric acid((H3Po4) and hot strong caustic solutions. Of these Hydroflouric acid has the most serious effect, even when it is present in PPM (parts per million) in solutions. Where as phosphoric acid and caustic solutions cause no problems when cold but at elevatrd temprature corrosion occurs. in case of caustic solutions upto 30% concentration can be handled safely at ambient temperature. Under actual operating conditions, the effect of turbulence, and traces of other chemicals in the solution may increase of decrease the rate of attack. So it is not possible to give exact figures for corrosion by caustic solutions. THERMAL PROPERTIES Linear coefficient of thermal expansion The coefficient of thermal expansion of borosilicate glass over the temperature 0 - 300°C is 3.3 x 10-6/°C. This is very low when compared with other glasses and metals. That is why, borosilicate glass is often called low expansion borosilicate glass. Specific heat Specific heat between 25°C and 300°C is average to be 0.233Kcal/Kg, °C Thermal Conductivity Thermal conductivity is 1.0 Kcal/hr,m°C. Over the permissible operating temperature range. ANNEALING Annealing of glass is the process where the glass is heated and kept for a defined period of time to relive internal stresses. Careful cooling under controlled conditions is essential to ensure that no stresses are reintroduced by chilling/cooling. The size normally use is dia 33mm X wall thickness 3.5mm X 1500mm Long tube dia 46mmX wallthickness 3.5mm X 1500mm long tube dia 50mmX wallthickness 1.8mm X 1500mm Long tube dia 68mmX wallthickness 1.8mm X 1500mm Long tube dia 115mm X wallthickness 5mm X 1500mm Long tube dia 163mm X wallthickness 5mm X 1500mm Long tube. FOR VMOHANLAL&CO. DIXIT SUTARIA (PARTNER)

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