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Based on the newly developed bonding system,a new generation of carbon-bonded MgO-C monolithic refractories product with low toxic potential has been developed.Results of an on-going investigation on properties of MgO-C monolithic refractories with tar-resin as binder are presented.Furthermore,the binder is an extremely strong carbon bonding.Further significant advantages of this system are high oxidation resistance of the highly-ordered carbon structure and the excellent stress-absorbing structure.To improve the strength and erosion resistance,and to decrease evaporation during heating,a preliminary treated tar-resin with higher melting temperature and lower content of volatile component was investigated.The binder specimens were treated at 800 ℃ and the mechanical properties of MgO-C refractories specimens treated at 200,400,and 1 200 ℃ were determined.