Printed circuit board laminates which have improved thermal stability. The improved properties are attributed to the use of a novel aluminium hydroxide which is described by the molecular representation: Al.sub.2 O.sub.3.multidot.nH.sub.2 O where n>2.6 and <2.9.

El tablero de circuito impreso lamina que han mejorado estabilidad termal. Las características mejoradas se atribuyen al uso de un hidróxido de aluminio de la novela que sea descrito por la representación molecular: Al.sub.2 O.sub.3.multidot.nH.sub.2 O donde n 2.6 y