The　reliability　of　the　three　point　bending　test　for　monolithic　refractories　with　coarse　aggregates　was　discussed．This　is　based　on　the　results　of　an　investigation　of　the　relation　between　the　three　point　bending　test　for　refractory　using　test　pieces　in　a　standard　brick　shape　test　piece　and　the　four　point　bending　test　for　construction　concreteusing　a　standardized　test　piece．The　Weibull　plot　of　the　strength　in　three　point　bending　test　converted　into　a　value　corresponding　to　a　four　point　bending　test　on　the　basis　of　the　effective　volume　overlayed　on　the　Weibull　plot　of　the　data　　obtained　by　the　four　point　bending　test．The　conversion　of　the　three　point　bending　strength　data　into　equivalent　four　point　bending　strength　revealed　that　the　three　point　bending　test　was　a　simple　and　highly　reliable　bending　test　suitable　for　monolithic　refractories　with　coarse　aggregates．

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