Standard Test Method for
Determination of Properties of Polymeric Materials by
Means of a Capillary Rheometer 1

This standard is issued under the fixed designation D 3835; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

1. Scope *

1.1 This test method covers the measurement of the rheological
properties of polymeric materials at various temperatures and
shear rates common to processing equipment. It covers measurement of melt viscosity, sensitivity, or stability of melt
viscosity with respect to temperature and polymer dwell time
in the rheometer, die swell ratio (polymer memory), and shear
sensitivity when extruding under constant rate or stress. The
techniques described permit the characterization of materials
that exhibit both stable and unstable melt viscosity properties.

1.2 This test method has been found useful for quality
control tests on both reinforced and unreinforced thermoplastics, cure cycles of thermosetting materials, and other polymeric materials having a wide range of melt viscosities.

1.3 The values stated in SI units are to be regarded as
standard. The inch-pound units given in parentheses are for
information only.

NOTE 1—Although this test method and ISO 11443–1995, “Plastic—
Determination of the Fluidity of Plastics Using Capillary and Slit-Die
Rheometers” differ in approach or detail, the data obtained using ISO
11443, Method A is technically equivalent to this test method

1.4 This standard does not purport to address all of the
safety concerns, 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

2.1 ASTM Standards:
D 618 Practice for Conditioning Plastics for Testing2
D 1238 Test Method for Melt Flow Rates of Thermoplastics
by Extrusion Plastometer2
E 691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method3

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