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Hi Alberto Stability = I mean lack of stress - Worst case example is tempered glass- the glass is quickly cooled usually a blast of cold air to both sides of the glass the outside cools quickly and the inside slower as the inside of the glass cools it puts compressive tension (stress) on the outside surface making the glass much stronger. Now if you grind one surface away the glass will warp because of the uneven stress if you keep grinding it will explode into a pile of small pieces. ---If your glass was not cooled slowly enough as you grind the glass could warp. Remember we are talking about 0.02 microns surface error. You can test the glass using cross polarized light for stress. ? It is possible to grind a mirror up to 250MM from 12 15 MM glass even larger sizes have been done successfully but the chance of failure is getting high. ? I am going to grind a 600MM diameter flat mirror from blank fabricated from 12.5MM soda glass. This is still experimental but if you are interested E-mail me directly at ron@... Ron AGUSTIN GASPARINI wrote:
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