called into question, the General Services Administration and various European governments published criteria that a safety film must meet in order to be certified as a blast- mitigation product and window film products must be certified by independent laboratories. Blast- resistant glazing must be able to withstand two specific pressure wave assaults - from the explosion itself, and to absorb blast energy. The size of blast and distance of the building from the blast point are critical factors. High tensile strength films bind deadly glass shards together during the blast (positive) phase of an explosion as well as the more dangerous vacuum (negative) phase. Laminated glass enables broken glass fragments to adhere to a plastic layer rather than spraying building occupants with harmful glass shards. Madico Safetyshield and the Framegard edge retention system from National Window Films is a blast mitigation film
and edge retention system which claims to be easily and relatively inexpensively fitted to existing glazing to provide comprehensive blast mitigation by keeping glass fragments contained.
Unobtrusive CIP Protection of public buildings and perimeters at airports and other critical infrastructure, combined with hostile vehicle mitigation (HVM), has to be as inconspicu- ous as possible. There are new containment systems based on cel- lular structures for unobtrusive spe- cific barriers that can be easily grassed or planted to blend with the surroundings. The DefenCell Profile300 Protection System from J&S Franklin used to build barriers and berms is made from geotextile materials layered in construction, which can be cut and shaped as needs require without losing any of their inherent strength.
Blast containment can be built into trash bins and other
containers, which during and since the IRA bombing campaign have been regarded as a means of dumping an IED in a crowded place without it being seen. Reinforced bins are made out of a high strength outer steel shell with a patented inner compressive layer to provide security, protection and safety to the surrounding public. The compressive layer is designed to absorb the major blast energy and resist fragments. The outer shell contains any remaining lateral blast energy and fragmentation and residual blast energy is vented upwards away from the public, keeping the receptacle unpenetrated.
Andy Oppenheimer is the author of IRA: The Bombs and the Bullets - A History of Deadly Ingenuity (Irish Academic Press) and former Editor of Jane’s Nuclear, Biological & Chemical Defence.
June 2010 Aviationsecurityinternational
www.asi-mag.com
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