Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 32586
An Investigation into Sealing Materials for Vacuum Glazing

Authors: Paul Onyegbule, Harjit Singh


Vacuum glazing is an innovative transparent thermal insulator that has application in high performance window, especially in renewable energy. Different materials as well as sealing methods have been adopted to seal windows with different temperatures. The impact of temperatures on sealing layers has been found to have significant effects on the microstructure of the seal. This paper seeks to investigate the effects of sealing materials specifically glass powder and flux compound (borax) for vacuum glazing. The findings of the experiment conducted show that the sealing material was rigid with some leakage around the edge, and we found that this could be stopped by enhancing the uniformity of the seal within the periphery. Also, we found that due to the intense tensile stress from the oven surface temperature of the seal at 200 0C, a crack was observed at the side of the glass. Based on the above findings, this study concludes that a glass powder with a lower melting temperature of below 250 0C with the addition of an adhesive (borax flux) should be used for future vacuum seals.

Keywords: Double glazed windows, U-value, borax powder, edge seal.

Digital Object Identifier (DOI):

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 623


[1] R. A. Synowicki, B. D. Johs, A.C. Martin. Optical properties of soda-lime float glass from spectroscopic ellipsometry. Thin Solid Films, 519 (9) (2011), pp. 2907-29134.
[2] Luo LH, Huang ZZ, Wu YF, Cheng D, Sun LL, Cheng L, et al. Sealing properties of BaOeCaOeAl2O3eB2O3eSiO2 glass ceramics to large size planar IT-SOFC.J Chin Ceram Soc 2014; 42(1):101 - 7.
[3] Robinson SJ, Collins RE. Evacuated windows-theory and practice. In Proceeding of ISES solar world congress; 1989. Kobe, Japan: Oxford: Pergamon; 1989.
[4] Griffiths PW, di Leo M, Cartwright P, Eames PC, Yianoulis P, Leftheriotis G, et al. (1998). Fabrication of evacuated glazing at low temperature. Sol Energy; 63:243 - 9.
[5] Miao H, Xi XB, Zhang RH, Zuo DW, Wang HL. Numerical calculation and experimental research on wind load of vacuum plate glass. Acta Energise. Solaris Sin 2013; 34(11):188895.
[6] Duffie, J. and Beckman, W. (1991). Solar engineering of thermal processes. 1st edition. New York: Wiley.
[7] Eames, P. (2008). Vacuum glazing: Current performance and prospects.
[8] Fang Y, Hyde TJ, Ayra F, Hewitt N, Eames PC, Norton B, et al. Indium alloy sealed vacuum glazing development and context. Renew Sustain Energy Rev 2014; 37:480 - 502.
[9] 9. Ng N, Collins RE, So L. Thermal conductance measurement on vacuum glazing. Int J Heat Mass Transfer 2006; 49(25 - 26):4877 - 85.
[10] Yu Li A, Du JP, Han MF, Peng SP. Structure and sealing properties of Bi2O3- EBaOeSiO2eRxOy glass. J University of Science and Technology Beijing 2011; 33(12):1529 - 35.
[11] Zhang LY, Qin ML, Qu XH, Lu YJ, Zhang XY. Study on active brazing of AlN Ceramics and Mo – Ni- Cu alloy. Rare Metal Mater Eng 2009; 38(12):2159- 62.
[12] Zhang RH, Ma CW, Miao H, Zhang Y, Kong DJ. Theoretical analysis and Experimental study on heat transfer in vacuum plate glass. Trans Chin Soc Agric Mach 2006; 12:134- 12.
[13] Fang, Y., Eames, P., Hyde, T. and Norton, B. (2005). Complex multilateral insulating frames for windows with evacuated glazing.
[14] Jae C, Hyuk K, Young K, Ju L and Sung P. Sealing Properties of Ceramic Fibre Composites for SOFC Application. 10.4028/