CLASSIFICATION OF GLASS - Soda lime glass - It is obtained from the fusion of a mixture of silica, lime, soda and alumina. Powdered glass too may be added This glass is also termed as Soda-ash glass, Soda glass or Soft glass It is used for glazing doors, windows and making ordinary glass wares. Lead glass - It is obtained from the fusion of a mixture of silica, lead and potash Powdered glass too may be added This glass is also termed as Flint glass Lead glass has highly shining appearance It is not affected by temperature Cut glass work, electric bulbs and optical glass are made from it. Boro-silicate glass - It is obtained from the fusion of a mixture of silica, borax, lime, and feldspar Powdered glass too may be added This glass withstands high temperature Laboratory equipment and kitchen utensils are made out of it. Glass is marketed in various commercial forms to suit varying field requirements. Sheet Glass - Most extensively used in engineering works Size ► Thickness of 2, 2.5, 3, 4, 5 5.5 and 6.5 mm ► sheets up to 175 cm x 110 cm sizes are also available Ordinary glazing quality: Used for general glazing Selected glazing quality: Used for better quality works Special selected quality: Used for superior quality works such as show cases etc. It is made in thickness varying from 3mm to 32 mm and sizes up to 275cm x 90cmm. It is stronger and more transparent than the sheet glass. Tempered plate glass - Glass plate is heated and then suddenly cooled to tamper it Tempered glass is much stronger than ordinary sheet glass.

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Classification of Glass

Classification of Glass based on Composition & Applications

By: Haseeb Jamal

Classification of Glass

Glass is usually classified into three main classes:

Soda lime glass

·      It is obtained from the fusion of a mixture of silica, lime, soda and alumina.

·      Powdered glass too may be added

·      This glass is also termed as Soda-ash glass, Soda glass or Soft glass

·      It is used for glazing doors, windows and making ordinary glass wares

Lead glass:

·      It is obtained from the fusion of a mixture of silica, lead and potash

·      Powdered glass too may be added

·      This glass is also termed as Flint glass

·      Lead glass has highly shining appearance

·      It is not affected by temperature

·      Cut glass work, electric bulbs and optical glass are made from it

Boro-silicate glass:

·      It is obtained from the fusion of a mixture of silica, borax, lime, and feldspar.

·      Powdered glass too may be added

·      This glass withstands high temperature

·      Laboratory equipment and kitchen utensils are made out of it

Commercial Forms of Glass

Glass is marketed in various commercial forms to suit varying field requirements.

Sheet Glass:

·      Most extensively used in engineering works

·      Size ► Thickness of 2, 2.5, 3, 4, 5 5.5 and 6.5 mm ► sheets up to 175 cm x 110 cm sizes are also available

Ordinary glazing quality: Used for general glazing

Selected glazing quality: Used for better quality works

Special selected quality: Used for superior quality works such as show cases etc

Plate glass:

·      It is made in thickness varying from 3mm to 32 mm and sizes up to 275cm x 90cmm.

·      It is stronger and more transparent than the sheet glass

Tempered plate glass:

·      Glass plate is heated and then suddenly cooled to tamper it

·      Tempered glass is much stronger than ordinary sheet glass.

·      Used for glazing entrance doors, table tops, shelves, counters etc

Laminated glass:

·      Two or more glass plates with intervening layers of transparent plastics are bound under effect of heat and pressure.

·      This type of glass is not broken into pieces when it breaks

·      Ensures safety at places where glass is liable to shatter

·      Glazing windows and doors

Wired glass:

·      It is a rough cast translucent (semi transparent) glass with special steel wire mesh of 0.46 to 0.56 mm dia.

·      Wire mesh completely embedded between the layers of glass during manufacture process

·      Fire resistant and safe during breakage

Insulating glass:

·      Two layers of glass separated by 6mm to 12mm of air space are sealed to provide heat insulation

Colored glass:

·      By adding oxides of metals to metal glass the finish product get colored

·      Used for decoration works in building construction

Flint glass:

·      It is lead glass which shines

·      Used for glass work as optical glass, for making electric bulbs.

Haseeb Jamal. I am a Civil Engineer, graduated from University of Engineering and Technology, Peshawar, Pakistan in 2010. I also have a PG-Diploma in Disaster Management and MS in Urban Infrastructure Engineering (In Progress). My expertise include civil related softwares like AutoCAD, SAP2000, MS Project, Primavera, MS Office and GIS. My technical skills include project management, monitoring and evaluation, structural assessment, disaster risk management, Quantity survey, land survey, material testing, site management and technical writing. I am trained in writing project progress reports as well as proposals and concept papers. I have also received advanced training on surveying, proposal writing, Monitoring and Evaluation of projects as well as organizations.

I have worked as Project Engineer at National Research and Development Foundation, Peshawar and CENCON Associates. I also worked with Spectra Engineering Solutions as Senior Civil Engineer in monitoring of World Bank and UNDP funded projects all over Khyber Pakhtunkhwa and FATA. Currently, I am working as Deputy Manager Development at NayaTel, Peshawar.

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