"Ziggur" wrote in message
T...
In article ,
says...

Good question.

The pattern is embossed onto the normal thickness and therefore the
finished product has bits which are thinner. The manufacturers do not
produce all available textures in the toughened product because some deep
patterns leave pretty thin areas. The short answer is that textured
toughened glass is not as impact resistant for a given thickness as plain
glass.

The good news - if you buy textured toughened glass in the UK it would be
very unusual for it not to carry the BS6206 kitemark and it will
therefore be safe in your door. (Unless Dave P tries to drill a hole in
the corner with his DeWalt SDS!)

Safe, but also with enough working strength?

I am now left wondering why the builder thinks plain 4mm glass is OK, but
patterned glass is not. Perhaps he thinks you can't get 4.1mm toughened and
patterned glass?