1. Scope

1.1 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 sections 7-10 and 11-14, respectively.

1.2 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.

1.3 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 capillary rheometer measurements will usually differ from measurements with a screw extrusion type rheometer, which imparts shearing energy just before the rheological measurement.

1.4 Capillary rheometer measurements for plastics are described in Test Method D3835.

1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.

1.6 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D1349 Practice for Rubber--Standard Temperatures for Testing

D1418 Practice for Rubber and Rubber Latices--Nomenclature

D1485 Practice for Rubber from Natural Sources--Sampling and Sample Preparation

D3182 Practice for Rubber--Materials, Equipment, and Procedures for Mixing Standard Compounds and Preparing Standard Vulcanized Sheets

D3835 Test Method for Determination of Properties of Polymeric Materials by Means of a Capillary Rheometer

D3896 Practice for Rubber From Synthetic Sources--Sampling

D4483 Practice for Evaluating Precision for Test Method Standards in the Rubber and Carbon Black Manufacturing Industries

Keywords

capillary rheometer; flow properties; piston; processing properties; screw extrusion; shear rate; shear stress; viscosity; Capillary rheometer method; Flow and flow rate--rubber; Piston capillary rheometer; Process control; Raw rubber; Rheology/rheological properties--rubber; Rheometers; Rubber; Screw extrusion;

ICS Code

ICS Number Code 83.060 (Rubber)

DOI: 10.1520/D5099-93R98

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