Densification rates are reported for 3 classes of porous glass materials: soot preforms made by flame hydrolysis, silica gel, and phase‐separated and leached borosilicate glass. Viscosity values obtained by fitting the densification data to the theory of Part I of the present study are in reasonable agreement with viscosity measured by beam bending using fully sintered glass of the same type.
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Scherer et al. (1977) studied this question.
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