Standards transparency during

Such sol-gel derived and ultraviolet (UV)-curable hybrids afford enhanced corrosion and mechanical protection of fibres compared to standard polymer coatings used by the fibre optics industry. These coatings are hard, transparent and impossible to strip since they become intimately bonded to the fibre surface during curing. 

Reaction containment during microwave syntheses is relatively straightforward, but some limitations are imposed, as vessel materials must be both mechanically robust and microwave transparent. Ambient and elevated pressure vessels may be constructed from standard laboratory glassware, polytetrafluoro-ethylene (PTFC), or other microwave-transparent polymers, although vessels specifically tailored for microwave synthesis are commercially available. 

GPa (6 tons cm ). Without evacuation (e. g. when moist air is present during pressing) it is impossible to obtain highly transparent pellets. The size of the ground particles should not exceed 2 pm, otherwise scattering losses may result IR spectra obtained by the pellet technique often exhibit bands at 3450 and 1640 cm due to adsorbed moisture. Without the addition of an internal standard the pellet technique is not suitable for quantitative measurements because the thickness is not precisely reproducible and the size of the IR bands depends on the dispersion of the sample (see Fig. 6.3). 

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