ASTM D 5099 - 08 (Reapproved 2013) Standard Test Methods for Rubber - Measurement of Processing Properties Using Capillary Rheometry

Current edition approved Nov. 1, 2013. Published January 2014. Originally approved in 1993. Last previous edition approved in 2008 as D5099 – 08. — 9 p.
These test methods describe how capillary rheometry may be used to measure the rheological characteristics of rubber (raw or compounded). Two methods are addressed:
Method A—using a piston type capillary rheometer, and
Method B—using a screw extrusion type capillary rheometer.
The two methods have important differences, as outlined in 7 – 10 and 11 – 14, respectively.
These test methods cover the use of a capillary rheometer for the measurement of the flow properties of thermoplastic elastomers, unvulcanized rubber, and rubber compounds. These material properties are related to factory processing.
Since piston type capillary rheometers impart only a small amount of shearing energy to the sample, these measurements directly relate to the state of the compound at the time of sampling. Piston type capillary rheometer measurements will usually differ from measurements with a screw extrusion type rheometer, which imparts shearing energy just before the rheological measurement.
Capillary rheometer measurements for plastics are described in Test Method D3835.