Standard Test Method for
Single Pellet Crush Strength of Formed Catalyst Shapes1
This standard is issued under the fixed designation D 4179; 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 determining the resistance of
formed catalysts to compressive force and is applicable to
regular catalyst shapes such as tablets and spheres. Extrudates,
granular materials, and other irregular shapes are specifically
excluded.
1.2 This test method determines the average crush strength
in the range from 0 to 50 lbf (0 to 220 N).2
1.3 The values stated in inch-pound units are to be regarded
as the standard. The values in parentheses for information only.
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:
E 177 Practice for Use of the Terms Precision and Bias in
ASTM Methods3
E 456 Terminology Relating to Quality and Statistics3
E 691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method3
IEEE/ASTM SI 10 Standard for Use of the International
System of Units (SI): The Modern Metric System2
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 tablets—tabletted cylindrical catalyst particles, either
solid or hollow core, with lengths that do not vary from the
mean by more than 610 %.
3.1.2 pellets—any catalyst shape—tablets, spheres, or other
similar configuration—that is not otherwise excluded from the
scope of this test.
4. Summary of Test Method
4.1 Individual pellets taken from a representative sample are
placed between two flat surfaces, subjected to a compressive
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