The origins of Glass and lampworking

 

Much about the origins of glass still remains a mystery, it is a complicated and vastly discussed subject; some of the oldest pieces found can be dated back to 2500 B.C. 

It is believed the development of glass spawned from pottery workers creating small glazed ceramic objects such as beads. The ceramic they used was made by combing silica and an alkali in a high-heat process, metals were also refined using high temperatures. It was this combined knowledge of materials and pyrotechnics that prompted the development of glass.

Early glass workers are likely to have combined raw materials on a small scale to create the glass they needed however the glass industry went on to separate into two branches; that of glass making and glass working.



torchLampworking is a glass working technique thought to have been promoted by developments in chemical science. A need for clear durable vessels lead to the invention of a clear soda glass, however the glass-blowing techniques used at the time were not suitable for making small objects. 

It was discovered that by forcing a stream of air into a flame from an oil lamp, sufficient heat could be created to work with small pieces of glass. 

These fettled oil lamps would have looked very different form the torches used by lamp workers now but ultimately the spread of those first techniques in Europe in the 15th Century was the birth of lampworking and lead to its popularity across the world. Modern lampworking torches burn propane and oxygen gas.


Glass rods are heated in the torch flame and when the glass becomes molten it can be transformed into the desired shape or design. 


The text above is just a short summary of the origins of glass and Lamp working; for further information please refer to the reference information links below.




ANNEALING GLASS AND WHY IS IT IMPORTANT?

Annealing glass is critical to its durability. Annealing is the process of slowly cooling glass to relieve any internal stresses that will have occurred during creation. The process is carried out in a temperature controlled kiln. The glass is placed in our kiln after being worked in the lampworking flame and slowly heated to reach the stress relief point this is the temperature at which the glass is still too hard to deform but is soft enough for stresses to relax. The glass is then heat soaked for long enough for the temperature to be even throughout the glass, this step varies depending on the type of glass and its maximum thickness. The glass is then slowly cooled to below the stress point and can then be cooled to room temperature. This process can also be archived using a lampworking flame.

If glass is not annealed, it will retain many of the thermal stresses caused by rapid cooling and significantly decrease the overall strength of the glass and is liable to crack or shatter when subjected to small temperature change's or physical shock.




 

Interesting web pages to visit about glass and lampworking.

Origins of glass

Glass history

History of lampworking

 

FoxGlass, Wyebrook Castle Street, Builth Wells, LD2 3BN  01982 551423 mail@foxglass.co.uk
All pictures and content remain the property of FoxGlass and should not be used or reproduced without prior consent from FoxGlass.

  Site Map