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The double cantilever beam technique has been used to measure the fracture energy of a series of cured epoxy resins. A range of materials was produced by varying the proportion of resin to hardener agent (Araldite CT200 and hardener HT901 -phthalic anhydride, CIBA Ltd) and by adding silica flour or aluminium powder as a filler.The fracture energy for crack initiation in the cured epoxy resins ranged from approximately 103 to 105 erg cm -2, and in the "filled resins" from 104 to 5 • 10' erg cm 2, as the proportion of hardener increased. The fracture energy for crack arrest was somewhat lower at the higher hardener contents and particularly for the AI-filled material.

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