... .5mm dispersive air bubble,there is less 2 on the sight plane and less 5 on the No-sight plane. ... and in the 7.5mm to edge,the scrape of less than 10mm dont allow more 2 strips.7) The sight ... . Water-resistanceCooked in the water for 5 hours,then weigh up ,then titration with 25ml 0~31 ug/g4. ... resistanceCooked in the 0.5N NaoH for 3 hours,then Weigh up,weightlessness should be ≤75 mg/dm25. Temperature- ...