Study Of Lubricating Coatings For Glass Containers With Optical Microscopy And Ftir Microscopy (In Italian) English Version Available: Glass Technology 43 4 2002 Pp 147-156

Optical microscopy, transmission & reflection infrared spectroscopy, contact angle & weight loss on annealing are used to establish the thickness & homogeneity of organic coatings used industrially to lubricate glass containers. As shown by a range of experiments & mathematical simulations, infrared spectroscopy is suitable to detect in situ the C-H bands of the hydrocarbon material & to quantify organic coverage. Useful results are obtained using a FTIR spectrometer equipped either with a specular reflectance accessory or with an infrared microscope. Due to the different size of the area analysed, the first setup is suitable to monitor average coverage, & the second to check the local distribution. The study provides for the first time an estimate of the thickness of the cold end coatings & highlights their inhomogenous distribution & patchy structure.