PURPOSE: The titled composition having excellent heat resistance, heat insulation, and mechanical properties, especially slidability to soft metals, and good workability and moldability and useful as a sliding material, friction material, or the like, prepared by adding a specified composite filler to a specified thermosetting resin.

CONSTITUTION: The titled composition comprising 30W70wt% thermosetting resin essentially consisting of a polymaleimide of formula I , an aminophenol of formula II, and an epoxy compound having at least two epoxy groups on the molecule and 70W30wt% composite filler containing 50W83wt% fluorocarbon resin and 38W5wt% benzoguanamine/formaldehyde condensate. In the above formulas, R1 is an n-valent organic group, X1, X2, and R2 are each H, a halogen, or a monovalent organic group, n≥2, and m is 1W5. This composition has excellent heat resistance, heat insulation, and mechanical properties, especially slidability to soft metals such as Al and brass, and good workability and is useful as a sliding material, friction material, electrical insulating material, or the like.