Introduction to safer
It seems that nearly every day we hear stories of break-in’s and threats of terrorism. It is unnerving and affects all of us, as we could all be at risk. Selectaglaze secondary glazing can provide an unseen level of security to any property. It creates a second barrier of protection from the inside that can prevent the most determined thief or protect the occupants from the effects of bomb blast. You may be looking to find ways to secure the contents of your building; be it physical high value objects or highly sensitive data or the people within. If this is the case, secondary glazing could provide the solution.
Benefits of security secondary glazing
- Deters intruders
- Blast mitigation
- Protection against firearms
- Preserves clean environments
- Second barrier to entry
- Removes the need for unsightly grilles
- Maintains a normalised environment
- Provides a delay mechanism
How it works
Physical attackUnder physical attack secondary glazing works by providing a second barrier to entry. At lower risk levels it must prevent manipulation of the locks and catches or removal of the glass or glazed panels. As the performance increases it must resist levering or use of cutting tools including penetration of the glazing, which at higher risk levels will be a sophisticated combination of glass, resin and polycarbonate. It is also worth noting that the attacker will have to break through the primary window first then work through the breached opening to attack the secondary glazing, by which time any vibration alarms will have been activated.
Blast mitigationSecondary glazing can protect occupants and contents from the effects of an explosion by containing the flying shards of glass from the breakup of the primary window under the blast load. Fixings, frame, locks and glass are all designed to work in harmony deflecting and yielding to absorb the blast wave. PVB interlayers are used in the laminated glass composition to stretch and contain the blast.
BallisticProtection from firearm attack is achieved by several layers of glass of various thicknesses laminated together. The front layers of glass are designed to shatter, thereby absorbing the initial impact energy, subsequent glass and interlayers absorb the lower level shock waves. Lighter, thinner bullet resistant glass can be produced by the use of polycarbonate in the lamination. However, bullet resistant glass is not enough on its own as the same performance is required from all the components of the frame including any joints and junctions.
FireFire resistant glazing provides a protected escape route for occupants. Specialist glass, together with fire and intumescent seals set within appropriate framing, resists the intense heat of a fire. This provides "integrity" which prevents breach of flames and gases, and where required "insulation" to reduce the transfer of heat.
Clean environmentsSecondary glazing with its high-performance seals and easy clean surfaces can provide an efficiently sealed envelope in clean, antibacterial and positive or negative pressured environments. Fitted on the inside of primary windows or in partitions, it can be used to stop the ingress of dust and grime and provide a protected space for blinds.
Guidance and regulations
- PAS 24:2012 – This standard simulates forced entry by the use of static loading as well as manipulation using simple tools. The test does not involve glass breakage and so replicates a stealth attack
- LPS1175 – Developed by the Loss Prevention Certification Board the standard deals with the elements of the building façade such as doors, widows, grills and enclosures. There are eight levels of resistance measured in terms of attack tools and time
- Secured by Design – Is a crime prevention initiative owned by The Association of Chief of Police Officers. Products successfully tested to PAS 24 are awarded a “Police Preferred Specification”
- Low - Guarding against an opportunistic attack by a thief who wants to work quickly and with the minimum chance of detection, secondary glazing can be used to provide an additional barrier to entry with simple locks and toughened or laminated glass. There are no test standards at this level
- Medium - To guard against a more determined attack by a thief who will be prepared to spend more time attacking a frame, but may not break the glass as this will attract attention. Secondary glazing tested to the security element of PAS 24 and certified to Secured by Design is recommended
- High - Guarding against an attack which is planned and very aggressive, where both the frame and glass will come under determined attack, then products certified to LPS 1175 are recommended
|Test Standard||Rating Level||Horizontal Sliding||Vertical Sliding||Hinged||Fixed||Demountable fixed||Product||Glass Options (mm)|
|PAS24:2012 (security requirement) Secured by Design||Single Level||x||S45 SHC||6.8|
|x||S46 FL||6.8 7.5 9.5 11.5 11.3|
|LPS 1175||SR1||x||S85 2HS||12.04|
|LPS 1175||SR2||x||S85 2HS||12 Tecdur 12.4 GPG|
|LPS 1175||SR3||x||S55 DFL||12 Tecdur|
Tecdur – specialist glass/polycarbonate laminate (glass face to room)
- ISO 16933 - Measures the effects of explosive devices of varying sizes at a number of distances. 100kg of explosive is used to replicate a vehicle bomb, starting at 45m distance (rating EXV45) reducing to 33m, 25m, 19m, 15m, 12m, and 10m (rating EXV10).
Risk levelsThe following is for guidance only and a full risk assessment by a security advisor is recommended.
- Low - The building is unlikely to be a direct target but is in commercial or public use and there exists a duty of care, or it may be a government building where a minimum requirement exists. EXV 45 should be considered.
- Medium - The building is unlikely to be a direct target but is close to a sensitive building which is considered to be a target. EXV 33 should be considered.
- High - The building is a potential direct target on account of usage or ownership. EXV 25 or higher should be considered.
|Test Standard||Rating Level||Horizontal sliding||Vertical sliding||Hinged||Fixed||Demountable fixed||Product||Glass Options (mm)|
(low hazard at 45m)
|ISO 16933|| EXV33
(low hazard at 33m)
|ISO 16933|| EXV25
(low hazard at 25m)
|ISO 16933|| EXV15
(low hazard at 15m)
When using Tecdur it is recommended that UV protection film is applied to the external glass
- EN 1522/1523 - This standard measures the resistance to penetration of the glass and the framing against various rounds. It has eight levels of certification covering handguns, rifles and shotguns.
|Test Standard||Rating||Horizontal Sliding||Vertical sliding||Hinged||Fixed||Demountable Fixed||Product||Glass options (mm)|
- BSEN 1363-1, BSEN 1364-1 tests the fire resistance of non-load bearing elements of the building.
|Test Standard||Rating||Horizontal sliding||Vertical sliding||Hinged||Fixed||Demountable fixed||Product||Glass options (mm)|
|30 minute integrity||x||S40 FL||10 PyrodurTM|