ASTM C325-07(2014)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: C325 − 07 (Reapproved 2014)
Standard Guide for
Wet Sieve Analysis of Ceramic Whiteware Clays
This standard is issued under the fixed designation C325; 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 (´) indicates an editorial change since the last revision or reapproval.
series, may also be used. If results are to be compared with those obtained
1. Scope
with sieves from theASTM series, it is important that the openings of the
1.1 This guide covers the wet sieve analysis of ceramic
sieves used fall within the tolerances specified in Specification E11 for the
whiteware clays. This guide is intended for use in testing corresponding ASTM sieves.
shipments of clay as well as for plant control tests.
4. Sampling
1.2 The values stated in inch-pound units are to be regarded
4.1 The sample shall be obtained in accordance with Prac-
as standard. The values given in parentheses are mathematical
tice C322.
conversions to SI units that are provided for information only
and are not considered standard.
4.2 The sample as received shall be placed in a drying oven
at 100 to 110°C for a period of not less than 5 h prior to testing.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5. Procedure
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 5.1 Transfer duplicate portions, of approximately 250 g of
the dried clay sample, weighed to the nearest 0.1 g, to
bility of regulatory limitations prior to use.
containers of at least 2-L capacity. Wet the clay with 1 L of
2. Referenced Documents
water and allow to slake for 2 h. If a free-flowing slurry is not
produced by this treatment, add another 500 mL of water.
2.1 ASTM Standards:
C322 Practice for Sampling Ceramic Whiteware Clays
5.2 To ensure complete separation of clay from nonplastic
E11 Specification for Woven Wire Test Sieve Cloth and Test
impurities, agitate the slurry by means of a mechanical stirrer
Sieves
(3.1). Continue the stirring between 5 and 10 min.
5.3 Transfer the slaked and stirred sample, without loss, to
3. Apparatus
the finest sieve to be employed in the test, and wash by means
3.1 Stirring Device—A mechanical stirrer with a three-
of a small jet of water from a ⁄4-in. (6.4-mm) soft rubber hose
bladed propeller 2 in. (51 mm) in diameter and having a speed
attached to a water supply having a pressure not in excess of
of approximately 1700 r/min, or the equivalent, shall be
that of an ordinary city main. The force of the jet may be
provided.
controlled by compressing the end of the hose between the
3.2 Sieves—The sieves shall conform to Specification E11
thumb and forefinger. Take care to avoid loss of sample from
andshallincludetheNo.100(150-µm),No.140(106-µm),No.
splashing. Continue washing until water passing through the
200 (75-µm) and No. 325 (45-µm) sieves (Note 1). The wire
sieve shows only traces of sample. Should lumpy material
cloth for these sieves shall be woven (not twilled) and shall be
remain on the screen, return the residue to the stirrer container
mounted in circular metal frames 8 in. (203 mm) in diameter,
by careful washing with a gentle jet of water, and agitate in
which shall be so constructed as to permit nesting of two or
approximately 1 Lof water for 10 min, then wash the slurry as
more sieves. A pan and cover for the sieves shall be provided.
previously described.
NOTE 1—Equivalent sieves from other standard series, such as theTyler
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 o
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