Development and certification of certified reference material of Mooney viscosity for styrene-butadiene rubber

The certified reference material of Mooney viscosity for styrene-butadiene rubber was developed via selecting styrene-butadiene rubbers produced by 5 domestic enterprises.The stability and homogeneity of the samples were inspected.The nominal value of the Mooney viscosity was obtained by the combined certification of 8 laboratories,and the uncertainty was evaluated.The results showed that when confidence probability was 95%,the certified reference material had good homogeneity and stability.When significance level was 0.01,the nominal value of ML(1+4)100 ℃ was 49.1,and the uncertainty was 0.8,which was better than similar foreign reference material.