ASTM C325-81(2007)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:C325–81 (Reapproved 2007)
Standard Test Method for
Wet Sieve Analysis of Ceramic Whiteware Clays
This standard is issued under the fixed designation C 325; 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.
sievesusedfallwithinthetolerancesspecifiedinSpecificationE11forthe
1. Scope
corresponding ASTM sieves.
1.1 This test method covers the wet sieve analysis of
ceramic whiteware clays. This test method is intended for use
4. Sampling
in testing shipments of clay as well as for plant control tests.
4.1 The sample shall be obtained in accordance with Prac-
1.2 This standard does not purport to address all of the
tice C 322.
safety concerns, if any, associated with its use. It is the
4.2 The sample as received shall be placed in a drying oven
responsibility of the user of this standard to establish appro-
at 100 to 110°C for a period of not less than 5 h prior to testing.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5. Procedure
5.1 Transfer duplicate portions, of approximately 250 g of
2. Referenced Documents
the dried clay sample, weighed to the nearest 0.1 g, to
2.1 ASTM Standards:
containers of at least 2-L capacity. Wet the clay with 1 L of
C 322 Practice for Sampling Ceramic Whiteware Clays
water and allow to slake for 2 h. If a free-flowing slurry is not
E11 Specification for Wire Cloth and Sieves for Testing
produced by this treatment, add another 500 mL of water.
Purposes
5.2 To ensure complete separation of clay from nonplastic
impurities, agitate the slurry by means of a mechanical stirrer
3. Apparatus
(3.1). Continue the stirring between 5 and 10 min.
3.1 Stirring Device—A mechanical stirrer with a three-
5.3 Transfer the slaked and stirred sample, without loss, to
bladed propeller 2 in. (51 mm) in diameter and having a speed
the finest sieve to be employed in the test, and wash by means
of approximately 1700 r/min, or the equivalent, shall be
of a small jet of water from a ⁄4-in. (6.4-mm) soft rubber hose
provided.
attached to a water supply having a pressure not in excess of
3.2 Sieves—The sieves shall conform to SpecificationE11
that of an ordinary city main. The force of the jet may be
andshallincludetheNo.100(150-µm),No.140(106-µm),No.
controlled by compressing the end of the hose between the
200 (75-µm) and No. 325 (45-µm) sieves (Note 1). The wire
thumb and forefinger. Take care to avoid loss of sample from
cloth for these sieves shall be woven (not twilled) and shall be
splashing. Continue washing until water passing through the
mounted in circular metal frames 8 in. (203 mm) in diameter,
sieve shows only traces of sample. Should lumpy material
which shall be so constructed as to permit nesting of two or
remain on the screen, return the residue to the stirrer container
more sieves. A pan and cover for the sieves shall be provided.
by careful washing with a gentle jet of water, and agitate in
NOTE 1—Equivalentsievesfromotherstandardseries,suchastheTyler
approximately 1 Lof water for 10 min, then wash the slurry as
series, may also be used. If results are to be compared with those obtained
previously described.
with sieves from theASTM series, it is important that the openings of the
5.4 Wash the residue remaining on the finest sieve into the
pan.Thoroughly wet the remaining sieves to be used in the test
with clear water, and nest them in the proper sequence on the
This test method is under the jurisdiction ofASTM Committee C21 on Ceramic
finest sieve. Wash the residue in the pan quantit
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