The design of the new concept enables it to survive a high energy explosion, using a variation on the Pilkington Planar fixing mechanism, which keeps the stresses around the countersunk boltholes supporting the glazing to an absolute minimum.
Under blast conditions, the strength of Pilkington Planar is derived from its ability to deflect and absorb the energy generated by the blast. When tested, the Pilkington Planar system achieved a UK EDICTS rating of Very High Level of Protection Glazing, equivalent to that of a GSA Class 1 rating in the USA.
Source
Glass Age
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