Glass and Explosions

Glass and Explosions

Glass that is able to protect an area from an explosive force is not new but has become a familiar requirement for the age we live in.  Like fire resistance and manual attack the glass has to form part of a complete system and will not perform as required in isolation.  Glass can be tested to the European standard below.

 

EN 13541 : 2000 : 'Glass in building - Security glazing - Testing and classification of resistance against explosion pressure'

Subject to blast waves generated using shock tube

Simulation of high explosive detonation

4 classifications (ER1, ER2, ER3 and ER4)

S (Splinters) or NS (No splinters)

 

The selection and application of blast resistant glass needs specialist advice and there are consultancies who offer advice in this area.  Like most threats it can be hard to determine the size of the explosion and the proximity to your location.  The channelling effect of other buildings and street architecture can change the way the pressure wave effects buildings.   Post examination of explosions can reveal some odd results.  Unprotected buildings further away can sometimes have more damage than more immediate buildings.  Although there is a pressure wave the result is glass being pulled out of buildings rather than being pushed in.  Once the initial pressure wave of air has hit the building there is a vacuum left where the air has been violently moved out of position.  It is the suction effect that can pull the glass outwards.  

A common design is to use an outer pane of toughened glass and a fairly slim pane of laminated glass to the inside.  The flexibility of the glass allows the energy to be absorbed  even though the glass may break.  It is important that the glass remains in its frame rather than becoming part of the problem.  To make the glass stiffer can result in the energy being imparted to the frame or the building structure.  Structural failure of the building is far worse that losing the glass panes. 

Pilkington has demonstrated in field tests with framing manufacturers and with the Pilkington Planar System that glass can be designed to provide protection to people and buildings to a high level.     

 


 

We value your privacy.

We use cookies on this website for analytics, remarketing, social media (optional) and content (essential) purposes.

By clicking ‘Accept All’ you consent to the use of cookies for non-essential functions and the related processing of personal data. Alternatively you can reject non-essential cookies by clicking ‘Essential Only’. You can adjust your preferences at any time by visiting our Cookie Policy and access the settings on that page.

For more information please read our