Tony Hansen on fri 18 aug 00
I saw quite a few comments on this so I thought I would post the
results of our lab tests on it. You need to view this using a monospace
font so column of numbers line up.
NUMBER: L3136
DESCRIP: PHOENIX HIGHWATER OVENWARE BODY
DATE: 06/16/00
========================================
The manufacturer states: "Very popular high fire body. Excellent thermal
shock properties. Perfect for the oven. Contains 6% fine mullite."
It exhibits a light beige fired color in oxidation. The color is stable
and very similar from cone 9-11. The darkness of the color suggests the
presence of a light burning stoneware or a high ball clay content
(another
body that we make has 70% ball clay and fires lighter than this).
It is very plastic for throwing, stiffness was about right or perhaps a
little too stiff. It feels like a high ball clay body.
The light color of the pugged material suggests one of the low carbon
ball
clays like Old Hickory #5 or Spinks Champion.
It has a sharp fine grog material, perhaps the mullite. This can be felt
against the wheelhead when throwing. The fired clay surface has lighter
colored mullite specks against the darker clay matrix. Some of these are
large enough that it could cause problems on the lips of mugs.
The body has not reached zero porosity at cone 11 so it likely has 15%
or
less feldspar. At cone 6 the porosity is above 4%, this will cause some
problems with leeking if the glaze crazes.
SHRINKAGE/ABSORPTION/H2O (ID-AB, ABBR-SHAB)
DRY-LEN FIR-LEN FIRE-WT BOIL-WT CONE RING COLOR F SHR D SHR
ABSORP
+-------+-------+-------+-------+-----+-----+-----+
7 |94.21 |88.13 |39.63 |41.18 |6.6 |29 | | 6.5 5.8%
3.9%
8 |94.15 |87.68 |39.32 |40.29 |8.1 |34 | | 6.9 5.8%
2.5%
9 |94.03 |87.43 |40.04 |40.56 |9.5 |36.5 | | 7.0 6.0%
1.3%
10 |94.13 |87.55 |39.56 |39.91 |10.3 |38 | | 7.0 5.9%
0.9%
11 |94.26 |87.66 |39.78 |40.09 |11.1 | | | 7.0 5.7%
0.8%
12 |94.25 | | | | | | | n/a 5.8%
n/a
+-------+-------+-------+-------+-----+-----+-----+
DRYING FACTOR (ID-DF, ABBR-DFAC)
DRY_FAC SOLUBLES
+-------+-------+
1 |C423 |VLITE |
+-------+-------+
SEIVE ANALYSIS (ID-SV, ABBR-SIEV)
TOTAL PLUS-35 +48 +65 +100 +150 +200 +325 NOTE
+------+-------+-----+-----+-----+-----+-----+-----+------+
1 |100 |0.45 |.72 |.76 |1.07 |.87 |1.17 |2.28 | |
+------+-------+-----+-----+-----+-----+-----+-----+------+
--
Tony Hansen, Plainsman Clays Ltd.
Email: plainsman@digitalfire.com
Web: http://digitalfire.com/plainsman
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