... ) Materila : Borosilicate glass 3.3,Borofloat 3.3,Pyrex 3.3 2) Techniques for Borofloat 3.3: by Molding or Cutting, Grinding, Polishing3) Quality of Borofloat 3.3 : Resistance to hight ... inside bubble and dirts,4) Application of Borofloat 3.3: Light System,Electronics 5) Purpose of Borofloat 3.3 :Including square lens,film lens,spot lens ...