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The failure strength of glass as determined in bending tests shows a lot of scatter. In addition there is no easy statistical description of the failure strength. Part of the problem is that data sets are usually too small. To solve this a large research project was conducted that involved the effects of stress corrosion, tin side and original scoring side on the failure strength of cut, ground and polished annealed float glass. The results show that there are different strength groups, with different fracture morphologies. The change in fracture morphology is coincident with a change in average strength and Weibull modulus. Allowing for this change in fracture morphology allows a much better description of the failure strength of glass thus improving the reliability of a strength value.