The mechanical properties of inviscid melt spun (IMS) CaO-Al2O3 (46.5 wt% CaO-53.5 wt% Al2O3) eutectic fibres were examined by fractographic analysis as well as four-point bending and micro-indentation. The averaged fracture strength and elastic modulus values of the IMS Calcia-Alumina (CA) fibre were determined to be 460 MPa and 99.8 GPa, respectively by using four-point bending tests. The inner mirror constant (M) was determined to be 2.39 MPa . m(1/2) by using the plot of the fracture strength (sigma(f)) obtained from the bending tests as a function of r(-1/2), where r is the inner mirror radius measured from scanning electron microscopy (SEM) on the fractured CA fibres. The flaw-to-mirror ratio (c/r) for the CA fibre was calculated to be 1:11.24. Also, the critical flaw size (c) of the CA fibre was estimated to be 2.35 mu m The averaged elastic modulus value from Knoop micro-indentation was determined to be 102.5 GPa which is in good agreement with that from the four-point bending tests.