Raw Materials Used in Glass Manufacturing Process

In glass manufacturing process, the transparent hard body is created by the application of vast amounts of heat to sand or quartz. Glass is an amorphous inorganic, homogeneous transparent or translucent material which can be molded into any shape.

Based on the type of glass, its raw materials are collected and different compositions are sent to the manufacturing process. Following are the raw materials for different types of glass.

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A collection of Raw Materials for Glass Manufacturing Process:

Types of Glass
Raw Materials for Glass Manufacturing Process
Soda lime glass Chalk soda ash (Na₂CO₃) and clean fresh sand
Potash lime glass Chalk, potassium carbonate (K₂CO₃) and clean fresh sand
Potash lead glass Litharge (lead monoxide PbO) or lead sesquioxide (Pb₃ O₄), Potassium carbonate (K₂CO₃) or pure sand
Common glass Chalk, salt cake (Na₂SO₄), coke, ordinary sand.

Preparation of Batch in Glass Manufacturing Process:

Batch preparation is one of the first phases of the manufacturing process of glass, which involves weighing fine ground raw materials. This process includes formers, fluxes, stabilizers and sometimes colorants according to recipe required for the final product of the glass. The fine raw materials are subsequently mixed with each other to achieve a homogenous composition and then they are transferred into the melting furnace.

Also Read: History of Glass

Melting in the Furnace:

Melting of raw materials at high temperature to form a molten glass is the central phase in the manufacturing of glass. There are numerous ways to melt glass depending on the desired product, its end use, the prevailing commercial factors and the scale of operation.

Fabrication of Glass into Desired Forms:

Fabrication of glass techniques include cutting, grinding, laminating, and drilling. Glass fabrication requires polishing, bending, finishing and edging in most of the cases. Precision and quality are of the utmost importance in fabrication processes. So that Computer Numerical Control machines are used.

Annealing in Glass Manufacturing Process:

It is a process of slowly cooling hot glass objects after it was formed. It is the process to relieve residual internal stresses introduced during manufacture.

In glass manufacturing process, quality is checked before packaging process. The final glass product is rejected if the bubble or sand grain that refuses to melt. Nowadays inspections are done automatically to detect the defects in the glass which are not seen through the naked eye.

After all the glass manufacturing process, manufactured glass can be stored as per the required shape & size and then sent it to the retail outlet store.

Also Read:

Different Types of Treatment on Glass
What is Glass & How it is Made?

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Comments (3)

    1. Dear Issa Zoghi
      Thank you for contacting gharpedia.
      Coke is formed during the manufacturing of glass, due to the presence of impurities in the recycled glass or cullets.
      The coke grain size influences the molten glass in the float process. The coke reacts with the sulphur present in the glass during the reduction reaction. The extent of the reduction reaction depends on the coke grain size. This reduction reaction may cause a change in colour of the molten glass. For a detailed analysis, the chemical reactions have to be analysed which are occurring during the manufacturing. Therefore, it is better to contact a glass manufacturer.
      Thanking You
      Gharpedia Team

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