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Test overcomes shortfalls of scorch measurements

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Executive summary

Traditional measures of scorch, such as Mooney scorch, ODR ts2, MDR ts1 and tc10, have been used to predict how well a new formulation will process in the factory. However, it has been recognized by many that different compounds can have identical traditional scorch values, but possess different propensities to
“burn up” or “scorch” downstream in the manufacturing process. Now there is a new short test, ASTM D6204, which can be used with traditional scorch tests to more effectively predict the ownstream processability characteristics of a new compound and indicate whether it will experience downstream scorch problems
in the plant. This new test can take into account differences in viscous heating and very easily can be combined with a special variable temperature scorch test for even greater sensitivity to processing differences among compounds. This paper reviews the traditional methods of measuring scorch (time to the onset of vulcanization), the special effects of viscous heating, how to measure viscous heating, and what isothermal rheological properties effectively corre-late to viscous heating.

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Nguồn: Quốc Anh, Cao su Đức Minh

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