BS EN 12600 has now superseded BS 6206 as a European wide performance standard for impact safety for glass. Developed to be a more ‘modern’ test it provides much the same performance levels as BS 6206 (which is still often referred to).
Both standards relate to the impact performance requirements for glass within buildings and use the pendulum test where a weight is dropped from three heights onto a standard sized pane of safety glass.
The safety test will define the level at which the glass ‘breaks safely’ (if it breaks) and that provides the impact safety rating based on the three drop heights:
190mm drop height (3B3) is considered to be equivalent to an adult pushing hard against the glass or a child running into it.
450mm drop height (2B2) is considered to be equivalent to more than an adult walking into a glass door but less than a determined attempt to force a way through by running at it.
1200mm drop height (1B1) is considered to be equivalent to a full-grown adult running into the glass with insignificant or no injury.
The table below provides a comparison between classifications (in order of highest performance) within BS EN 12600 and BS6206:
To identify the grade of safety glass used each pane should be indelibly marked so that the marking is visible after installation.
Building Regulations set out specific requirements with regards to protection from impact with glazing and these include what impact safety rating must be used in Critical Locations.
Note: do we have room to include our image of Critical Locations on the page?
For more information see: www.gov.uk/government/publications/protection-from-falling-collision-and-impact-approved-document-k.
TYPICAL SAFETY GLASS USAGE
Due to laminated glass remaining intact on impact it is generally used where there is a risk of an incident caused by falling glass should the glass be damaged, as well as where there is high human impact and the need to prevent potential injury. Laminated glass is frequently used in exterior shop-fronts, curtain walling and windows, overhead glazing, full-height barriers, doors and low-level glazing. It has many commercial, public and residential applications.
Toughened glass also has a number of applications and in building projects it is often used as glass facades, Glass Partitions,
, sliding doors, glass doors and windows. It is also used in furniture such as table and counter tops.
We have our own Toughening Plant and can provide toughened glass cut to size ranging from 4mm to 25mm in thickness.
As with other types of glass, safety glass is flexible and can be used in different forms; including within IGUs
and with colour/tinted options.
Safety glass is not of itself fire resistant but there are certain types of fire rated glass that come with safety impact ratings. In particular, our 19mm FireSafe Modified Toughened product which is certified fire resistant and physical attack resistant and has been specially developed for use in secure institutions as vision panels, side screens and partition walling. Our Glass Selector tool will help you identify products that are both fire-rated and impact safety rated.
THE BENEFITS OF SAFETY GLASS
There are different types of safety glass, each with its own benefits depending the intended usage and impact safety rating required.
– this safety and security glass is typically made up of one or more panes of glass with bonded interlayers of PVB (polyvinyl butyral). This type of glass is no stronger than ordinary glass but it will remain intact on impact as a result of the bonded
interlayer which prevents the glass from breaking into large pieces. It can therefore withstand repeated blows from heavy objects and remain as a barrier to entry even if the glass has been broken. Laminated glass can have different impact ratings depending on the thickness of the glass used and the number of interlayers. It can also provide sound insulation (acoustic abilities) and thermal insulation (energy efficiency).
– this safety and security glass is processed by a controlled thermal or chemical treatment to significantly increase its strength compared to ordinary non-processed glass. Whilst significantly stronger (up to five times) this type of glass is still breakable on impact. However, it will not break in the same way as ordinary glass – it does not break into large jagged shards and will instead break into small cube-liked pieces that are less likely to cause injury. The key benefit of toughened glass is its strength in terms of the impact required to break it – it has the highest performing classification of impact rating.
– this is a type of safety and security glass due to the wire netting embedded within it during the manufacturing process. The wire netting reduces the probability of the glass shattering on impact and is intended to hold the glass together if it cracks. However, this type of glass still breaks in the same way as ordinary glass and it will break into large jagged pieces on impact outside of its impact safety rating.