Quartz Glass. Tubes and Rods
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1 Quartz Glass Tubes and Rods PH 300, GE 214, QI PN GVB Solutions in Glass Schlackstrasse Aachen Germany / / E- info@g-v-b.de
2 Table of contents General Information page 3 Chemical reaction and chemical properties of quartz glass page 4 Physical data of quartz glass page 5 Optical properties of quartz glass page 6 Traces contamination of quartz glass page 7 Treatment and cleaning of quartz glass page 7 Products / delivery possibilities page 8 Technical delivery conditions of quartz glass page 8 1
3 General Information The chemical composition of quartz glass is the simplest mesh among all glasses. Due to its specific physical and chemical properties, quartz glass, which is melted from pure silicon dioxide (SiO2), is used for the following applications: For high temperature processes quartz glass is recommended due to its high temperature resistance. Due to the high pureness of this material, components and systems made of quartz glass are used in the semi conductor and lamp industry. In the illuminate production quartz glass is regarded as key material due to its very good transparency in the ultraviolet, visible and infrared wavelengths and its high temperature resistance. In the electronics and electro-techniques quartz glass is used due to its low electric conductance and its low dielectric leakage. In the field of plant construction and tool building, quartz glass is widely used due to its high resistance against saline solutions, acids and water. Besides hydrofluoric acid and hot phosphoric acid, quartz glass is not corroded by any acid and acts neutrally against many other substances. 2
4 Chemical Reaction and Chemical Properties of Quartz Glass Quartz glass is extraordinarily resistant against water, saline solutions and acids. In opposite to ordinary glass, quartz glass is not hygroscopic. It is only corroded by hydrofluoric acids. Besides alkali and alkaline earth metals, oxide free metals do not react with quartz glass. Therefore, they can be distilled and melted in quartz glass containers. Quartz glass is sensitive against all alkali and alkaline earth compositions. Even traces of these compositions accelerate defects at high temperatures. Reaction of different elements and compositions against quartz glass: Groups Elements Compositions Effects Remarks Metals/Non-Metals Ag AL starting app. 700 C quick reaction Au Br C starting app C Ca starting app. 600 C Cd Ce starting app. 800 C Cl F strong reaction only in humid conditions Hg J Li strong reaction starting app. 200 C Mg starting app. 700 C Mn Mo Na reacts only as vapour P strong reaction Pb Pt S starting 1000 C low reaction Si Ca Cd Ce Cl Oxides F starting app C Hg starting app. 900 C J starting app C Li starting app. 950 C Mg starting app. 950 C Mn starting app. 950 C Mo Na starting app. 800 C P starting app. 800 C accelerated defects Acids Pb HNO 3 HCL HF strong reaction lower than for other glasses H 3 PO 4 strong reaction lower than for other glasses Gasses and Vapours HCL 3
5 Groups Elements Compositions Effects Remarks H 2 /N 2 /O 2 NO 2 /SO 2 CO Salts BaCl 2 BaSO 4 starting app. 700 C Borate BCl 3 starting app. 900 C KCL accelerated defects KF NaCl Na-Metaphosphat strong reaction Na-Polyphosphat strong reaction Na 2 SO 4 Na-Wolframat strong reaction accelerated defects Nitrate ZnCl 2 Zn-Phosphat at app. 300 C low, than increasing Zn-Silikat starting app C The pureness of quartz glass is extraordinarily high. An exact analysis of trace elements is very difficult. The analysis results often are close to the limit of verifiability. Minor spread of values is caused by fluctuations in the pureness of the initial material. Hydrolysis class 1 acc. DIN Acid class 1 acc. DIN Base class 1 acc. DIN Physical Data of Quartz Glass Description Value Unit Mechanical Properties density (20 C) 2,2 g/cm 3 tensile strength 50 N/mm 2 pressure resistance 1150 N/mm 2 elasticity modulus 7,3 x 10 4 N/mm 2 torsion modulus 3,1 N/mm 2 modulus of rupture 68 N/mm 2 Poisson ration 0,17 Mohn-hardness 5,5 6,5 micro hardness N/mm 2 Knoop hardness N/mm 2 sonic speed of longitudinal wave 5720 m/s ultra sound velocity at 50 C 5960 m/s Thermal Properties coefficient of expansion (0 300 C) 0,58 x 10-6 K -1 lower limit for tension release (14,5 dpas) 1160 C upper limit for tension release (13,0 dpas) 1260 C refractory deformation temperature (7,6 dpas) 1760 C processing range (5 8 dpas) C 4
6 maximum duration of permanent processing temperature 1100 C maximum duration of short-time processing temperature 1300 C medium specific heat (0 100 C) 770 J/kg K heat conductivity (100 C) 1,47 W/K m gas permeability for helium (300 C) 2, cm 3 mm/s cm 2 mbar gas permeability for hydrogen (300 C) 0, cm 3 mm/s cm 2 Electric Properties specific electric resistance (20 C) Ω cm dielectric constant (20 C und 10 6 Hz) 3,7 Durchschlagsfeldstärke (20 C) KV/cm dielectric loss factor (1 khz) < Optical Properties of Quartz glass Refraction index at 587,56 nm is 1,459 In opposite to silicate glasses, quartz glass offers a very good permeability for all wavelength areas. GE 214 PH 300 Wavelength (nm) Transmittance (%) transmission (%) UV wave length (nm) ,2 76,8 78,8 84,5 87,9 87,5 87,0 90,6 91,4 91,5 91,7 91,8 92,0 92,0 92,2 92,5 5
7 QI PN Traces contamination of Quartz Glass and OH Content in ppm The contaminations in quartz glass are very low. The table shows the largest and most important contaminations. Glass Al Ca Cu Fe K Li Mg Na Ti Zr OH GE ,35 0,2 0,5 0,5 0,6 <15 PH 300 0,8 0,05 0,3 1,6 1,4 0,1 1,6 <10 QI PN 16 0,8 0,3 0,9 0,7 0,9 0,9 1,5 25±10 Treatment and Cleaning of Quartz Glass A thorough and appropriate cleaning and treatment of quartz glass products is essential to maintain the properties. The following recommendations should be noticed: Recommendations for cleaning: Do not clean parts of quartz glass with non-alkali detergents. Contaminations with fat can be removed with alcohol. Acids in 5 % hydrofluoric acids for 2-3 minutes. Subsequent cleaning in distilled or deionised water. After cleaning, touch the quartz glass only with clean gloves. If possible, process quartz glass only after cleaning or pack it carefully. Quartz glass should always be touched only with gloves. You should also take care that the rooms, tools and machines meet high cleanness demands. 6
8 Products/Delivery Possibilities Quartz glass - tubes Quartz glass - rods Translucent quartz - tubes for infrared rays Doubt quartz glass tubes to avoid ozone formation and for UV-reduction For available measurements please see our price list. Customer specific cuttings upon request. Technical Terms of Delivery for Quartz Glass The value lists in the tables refer to industrial scratch and broken standard lengths. Saw cut lengths upon request. Tubes: A-Ø mm A-Ø ± % Ovality <= % Wall thickness ± % Eccentricity <= % Length ± mm <=5 2,0 2, >5 <=30 1,5 1, >30 <=40 2,0 1, >40 <=50 3,0 2, >50 <=55 4,0 2, Deflection <= mm/m Rods: A-Ø mm A-Ø ± % Ovality <= % Length ± mm >2 <= >5 <= Deflection <= mm/m Standard length1500 mm. Further dimensions upon request. Do you have any questions regarding our products or do you wish an individual consultation concerning quartz glass? Just send us an with your request. We would be happy to support your development with our know-how. Let's talk about it! G V B 7
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