Porosity Problems - Electric Mid&Hi Fired Ceramics2024-03-29T07:53:50Zhttps://cone6pots.ning.com/forum/topics/porosity-problems?commentId=2103784%3AComment%3A102092&feed=yes&xn_auth=noWhen you get your cones remem…tag:cone6pots.ning.com,2014-04-01:2103784:Comment:1020922014-04-01T18:56:20.611ZNadine Mercaderhttps://cone6pots.ning.com/profile/NadineMercader
<p>When you get your cones remember to give yourself a zone, if you are shooting for cone 6 I would place cones 5-7 on low, medium and high shelves. That will give you empirical evidence of what is going on in each zone. I am not a big fan of flat test tiles since that only provides limited color information. I prefer to save to use cracked bowls or other defective pieces from the same clay body. That way I can see how the glaze will run etc...</p>
<p>Good luck, I can't wait to see some…</p>
<p>When you get your cones remember to give yourself a zone, if you are shooting for cone 6 I would place cones 5-7 on low, medium and high shelves. That will give you empirical evidence of what is going on in each zone. I am not a big fan of flat test tiles since that only provides limited color information. I prefer to save to use cracked bowls or other defective pieces from the same clay body. That way I can see how the glaze will run etc...</p>
<p>Good luck, I can't wait to see some of your work.</p> Thanks for the feedback, I'm…tag:cone6pots.ning.com,2014-04-01:2103784:Comment:1019972014-04-01T18:26:40.026ZJeff Morfetthttps://cone6pots.ning.com/profile/JeffMorfett
<p>Thanks for the feedback, I'm typically quite methodical but having had what I thought was a success I've pretty much stuck with a method with minimal variation, whereas I probably should have experimented some more. All down to wanting to create finished pots I guess. I've made vertical test tiles for the ash glazes, but I'll start testing more routinely, even with commercial glazes. For starters I think I'll make some small dished tiles to test for porosity. I'll certainly go out and buy…</p>
<p>Thanks for the feedback, I'm typically quite methodical but having had what I thought was a success I've pretty much stuck with a method with minimal variation, whereas I probably should have experimented some more. All down to wanting to create finished pots I guess. I've made vertical test tiles for the ash glazes, but I'll start testing more routinely, even with commercial glazes. For starters I think I'll make some small dished tiles to test for porosity. I'll certainly go out and buy some cones.</p> Fire test tiles of each clay…tag:cone6pots.ning.com,2014-03-31:2103784:Comment:1020852014-03-31T19:31:05.197ZNorm Stuarthttps://cone6pots.ning.com/profile/NormStuart
<p>Fire test tiles of each clay and glaze. </p>
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<p>Some vendors, like Laguna Clay, publish the porosity for each of their clay bodies.</p>
<p>Laguna Hagi Porcelain, fired to cone 5 without glaze, absorbs <strong>0.5%</strong> water by weight.</p>
<p><a href="http://www.lagunaclay.com/clays/western/wc861.php" rel="nofollow" target="_blank">http://www.lagunaclay.com/clays/western/wc861.php</a></p>
<p>Laguna Speckled Buff, fired to cone 5 without glaze, absorbs <strong>3.0%</strong> water…</p>
<p>Fire test tiles of each clay and glaze. </p>
<p></p>
<p>Some vendors, like Laguna Clay, publish the porosity for each of their clay bodies.</p>
<p>Laguna Hagi Porcelain, fired to cone 5 without glaze, absorbs <strong>0.5%</strong> water by weight.</p>
<p><a rel="nofollow" href="http://www.lagunaclay.com/clays/western/wc861.php" target="_blank">http://www.lagunaclay.com/clays/western/wc861.php</a></p>
<p>Laguna Speckled Buff, fired to cone 5 without glaze, absorbs <strong>3.0%</strong> water by weight. </p>
<p><a rel="nofollow" href="http://www.lagunaclay.com/clays/western/wc403.php" target="_blank">http://www.lagunaclay.com/clays/western/wc403.php</a></p>
<p>Max's Paper Clay, fired to cone 5 without glaze, absorbs <strong>11.0%</strong> water by weight. Fired to cone 10 absorption is still <strong>5%</strong>. Very sponge-like. </p>
<p><a rel="nofollow" href="http://www.lagunaclay.com/clays/western/wc953.php" target="_blank">http://www.lagunaclay.com/clays/western/wc953.php</a></p>
<p></p>
<p>After applying and firing a glaze which is glassy enough, even Max's Paper Clay becomes water tight if there are no fractures. But many ceramicists don't like applying that much shiny glass to their artwork.</p>
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<p>From experience, these three glazes are watertight - Warm Jade, McCall's Great Grey, and Persimmon on Max's Paper Clay.<a target="_self" href="http://storage.ning.com/topology/rest/1.0/file/get/3127169760?profile=original"><img class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/3127165810?profile=original" width="360"/><img class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/3127169760?profile=original" width="360"/></a><a target="_self" href="http://storage.ning.com/topology/rest/1.0/file/get/3127169947?profile=original"><img class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/3127169947?profile=original" width="360"/></a></p>
<p>While these three glazes are not - Dry Pumpkin and Stonehenge Pike's Oatmeal. Guessing isn't the same as testing.</p>
<p><a target="_self" href="http://storage.ning.com/topology/rest/1.0/file/get/3127169990?profile=original"><img class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/3127169990?profile=original" width="360"/></a><a target="_self" href="http://storage.ning.com/topology/rest/1.0/file/get/3127170069?profile=original"><img class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/3127170069?profile=original" width="360"/></a><a target="_self" href="http://storage.ning.com/topology/rest/1.0/file/get/3127170199?profile=original"><img class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/3127170199?profile=original" width="360"/></a></p>
<p></p> Jeff,
I would try exactly wh…tag:cone6pots.ning.com,2014-03-31:2103784:Comment:1022942014-03-31T19:20:21.726ZNadine Mercaderhttps://cone6pots.ning.com/profile/NadineMercader
<p>Jeff, </p>
<p>I would try exactly what you thought of going to cone 6 with the second ramp. Also are you using witness cones? Good luck, look forward to hearing how it goes.</p>
<p></p>
<p></p>
<p>Jeff, </p>
<p>I would try exactly what you thought of going to cone 6 with the second ramp. Also are you using witness cones? Good luck, look forward to hearing how it goes.</p>
<p></p>
<p></p>