Differential thermal analysis techniques were used to characterize and
identify the sizings used to manufacture E and AR glass fibers. Altho
ugh the use of a nitrogen atmosphere makes it possible to perform a te
mperature scan from -70 to 500 degrees C, the changes produced at temp
eratures between -70 and +70 degrees C were observed and analyzed in t
his study. The sizings characterizing the E glass fibers were more sta
ble and less sensitive to aging than those characterizing the AR glass
as was confirmed by granulometric analyses.