ASTM D1646 Mooney Viscosity Test

The ASTM D1646 Mooney viscosity test and ASTM D6204 Part A Rubber Process Analyzer are commonly used to classify IR. There is no official classification system. However, Mooney viscosity and percent 1,4-ds-polyisoprene purity are two important parameters for classification purposes. 

Parallel plate or cone and plate rotational viscometers have been used to measure the viscosity of molten plastics and coatings for many years, but these types of viscometers are not commonly used to measure the viscosity of rubber. Because of the special nature of rubber, the Mooney viscometer has historically been used to measure and control the viscosity of raw rubbers as well as rubber compounds. The Mooney viscosity test is described by ISO 289, BS 903, Part A58, and ASTM D1646 [90]. 

ASTM D1646-03, Standard Test Methods for Rubber—Viscosity, Stress Relaxation, and Pre-Vulcanization Characteristics (Mooney Viscometer), 2003. 

Veith [l. j reviewed the current state of precision testing using some ASTM test methods in the rubber manufacturing industry in 1987, Mooney viscosity (ISO 289. ASTM D1646), a widely used test for quality assessment of raw rubbers, gave reasonably good relative precision. Type 1 (r) pooled values of 3,0 percent for several clear rubbers, and good pooled R) values of 3,8 percent on the same basis. See Annex D for the definition of Type 1 and 2 precision and (r) and (/ ), For a widely used rate-of-cure... 

Once the polymers are manufactured further characterization takes place prior to processing or during the process itself The two key properties that are critical are Tg and Mooney viscosity. The most convenient way to measure the Tg is by differential scanning calorimeter. Mooney viscosity is an industry specific test procedure that is used for assessing the processability of the rubber. Mooney viscosity (ASTM D1646) is measured by rotation of a disk inside a cavity imder pressure. This equipment does not measure the viscosity, but rather the torque required to rotate the disk at 100°C at a rate of 2 rpm. The results are usually given as... 

The next basic property that must be fixed is the viscosity of the grade to be used. This will require some knowledge of the viscosity limitations of the processes to be used. Viscosity is normally given in Mooney degrees determined on a Mooney viscometer (ASTM D1646-03) [20] using one of several test temperatures (usually 100 °C or 120 °C) and measured after a set period of time. Mooney viscosity influences such properties as processability, and the ability for extension with fillers and plasticisers. 

There is no standard classification system for CPE. However, Mooney viscosity (ASTM D1646) and percent chlorine are commonly used as characterizing tests. 

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