Wollastonite filled compounds

The moisture resistance properties of filled molding compounds are enhanced by the treatment of the fillers with silane adhesion promoters prior to compounding. Silane promoters on wollastonite fillers in thermoplastic polyester molding compounds (50 percent filled) will improve the flexural strength after 16 h in 50°C water by as much as 40 percent. Silane-treated silica fillers have been found to significantly increase the moisture resistance of epoxy adhesives used in the electronics industry for chip, surface-mounted, and printed-circuit processes.8... [Pg.188]

Because of their high crosslink density and very brittle behaviour, phenolic moulding compounds are invariably filled with reinforcing fillers such as wood floui wollastonite, mica, mineral wool flour and glass fibres. Solid moulding compounds are normally novolac based resins for transfer moulding (RTM) and other liquid laminating processes are resols. [Pg.444]