If you've lately been involved in s...

If you've lately been involved in specifying fire-rated glazing, chances are you were opposeed by a bewildering array of effects each with different characteristics and ratings, and all ruleed by an equally bewildering array of digests and standards.

That wasn't the case just 10 to 15 years ago, when fire-rated glazing was synonymous with a single product: wired glass. The principle was simple. Although the glass shattered on exposure to fire, wire interstice held the shards in place, thus confining exhalation and flames to their point of origin. In accordance with