ASTM D6175-98

Standard Test Method for Radial Crush Strength of Extruded Catalyst Particles

SCOPE
1.1 This test method is suitable for determining the resistance of extruded catalysts to compressive force from the side.

General Information

• Status: Historical
• Publication Date: 09-Apr-1998
• ICS: 19.060 - Mechanical testing
• Technical Committee: D32 - Catalysts
• Drafting Committee: D32.02 - Physical-Mechanical Properties

Relations

• Replaced By: ASTM D6175-03 - Standard Test Method for Radial Crush Strength of Extruded Catalyst and Catalyst Carrier Particles
• Effective Date: 01-Oct-2003

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn. Contact
ASTM International (www.astm.org) for the latest information.
Designation: D 6175 – 98
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
1
Radial Crush Strength of Extruded Catalyst Particles
This standard is issued under the fixed designation D 6175; 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 5. Significance and Use
1.1 This test method is suitable for determining the resis- 5.1 This test method is intended to provide information on
tance of extruded catalysts to compressive force from the side. the ability of an extruded catalyst to retain physical integrity
1.2 This test method was developed using extruded catalyst during use.
1 1
from ⁄16 to ⁄8 in. in diameter (0.159 to 0.318 cm) and limited
6. Apparatus
to pieces with a length to diameter ratio greater than or equal
to 1:1. This test method may be applicable to other diameters. 6.1 A suitable compression testing device is required, com-
posed of the following:
1.3 This test method is suitable for the determination of
mean crush strength per millimetre in the range of 0 to 15 6.1.1 Calibrated Pressure or Force Gage, marked for direct
lbf/mm (0 to 65 N/mm). reading of the force in pounds force (Newtons) with a range
about two times the expected average force reading. A suitable
1.4 The values stated in pounds lbf/mm units are to be
regarded as the standard. The values given in parentheses are system (mechanical, hydraulic, or pneumatic) must be pro-
vided so that the rate of force applied is both uniform and
provided for information only.
1.5 This standard does not purport to address all of the controllable within specified limits (see 9.4).
6.1.2 Tool Steel Anvils, between which the sample will be
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- crushed. The faces of the tool steel anvils shall be smooth and
free from hollows or ridges that would interfere with uniform
priate safety and health practices and to determine the appli-
cability of regulatory limitations before use. contact along the length of the extrudate. The faces shall be
parallel to each along their entire length of travel. The faces of
2. Referenced Documents
both anvils must be longer in one dimension than the length of
2.1 ASTM Standards: the sample pieces to be crushed.
E 177 Practice for Use of the Terms Precision and Bias in 6.2 A device for determining length, reading in millimetres,
2
ASTM Test Methods and of suitable accuracy to measure to the nearest tenth.
2
E 456 Terminology Relating to Quality and Statistics
7. Sampling
E 691 Practice for Conducting and Interlaboratory Study to
2
7.1 A test sample of 50 to 200 individual particles shall be
Determine the Precision of a Test Method
obtained from larger composites by riffling or splitting accord-
3. Terminology
ing to STP 447A (Section 5.12), with the aim of obtaining a
3.1 Definitions of Terms Specific to This Standard: representative sample that represents both the shape and size of
3.1.1 extruded catalyst particles, as used in this test method, the larger composite. The amount of the sample shall depend
cylindrical particles with uniform cross sections, either solid, on the precision required and the homogeneity of the material
hollow core, or multilobed, formed by extrusion. being tested. All of the individual particles sampled that have
a length to diameter ratio greater than or equal to one shall be
4. Summary of Test Method
tested.
4.1 Individual extrudates taken from a representative 7.2 Heat the test sample(s) at 400 6 15°C for not less than
sample are calcined, measured in length, placed between two
3h.
flat surfaces, and subjected to a compressive force. The force
NOTE 1—Moisture pick-up by extrudates is often rapid and the mea-
required to crush the extrudate is measured. The procedure is
sured crush strength may be affected.
replicated, the force per millimetre calculated, and the average
7.3 After heating, cool the test sample(s) in a desiccator or
of all quotients determined.
other suitable container to prevent the adsorption of moisture
before testing.
1
This test method is under the jurisdiction of ASTM Committee D-32 on
NOTE 2—If the catalyst may be damaged at 400°C, a lower temperature
Catalysts, and is the direct responsibility of Subcommittee D32.02 on Physical–Me-
can be used so long as it is specified with the result. Normally, this
chanical Properties.
treatment can take place in air. However, for materials that might react
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