The paper deals with properties of metallurgical sinter which are significant in the view of ironmaking optimization. It aims at study of metallurgical sinter disintegration. It presents experimental procedure for disintegration testing. The paper presents results of tests carried out in gaseous environment containing 30 % of carbon oxide and 70 % of nitrogen at temperature of 550 °C. It discusses them in relation with other properties of metallurgical sinter such as basicity P2 and content of FeO. The article summaries relevant studies and extends it with actual laboratory experiments.