All Glossary

Clay Body Porosity

In ceramics, porosity is considered an indication of density, and therefore strength and durability. Porosity is measured by the weight increase when boiled in water.

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Details

In ceramic testing this term generally refers to the pore space within a fired clay body. It is measured by weighing a specimen, boiling it in water, weighing it again, and calculating the increase in weight (thus it is also known by the term absorption). As ceramic clay bodies vitrify in a kiln they densify and shrink (thus reducing pore space). The % porosity of a body is thus an indicator of its degree of vitrification. Porosity also implies strength (in comparison to specimens fired at different temperatures that have greater or lesser porosities). Porcelains normally can be fired to a point where no porosity can be measured (termed zero-porosity). Typically, continuing to fire higher brings ware closer to melting and therefore much more likely to warp out of shape. Stonewares and earthenwares having coarser particles in the body usually reach a minimum porosity that can be well above zero (as much as 3%), firing beyond that bloats or melts the body. It is thus important to fire your clay body across a range of temperatures below and above what you work at to get a complete picture of its density as it relates to firing temperature. Developing an efficient way to make, fire, measure, boil and weigh test bars is a key to being able to do this. You can use an account at insight-live.com to learn how to do this and log and report your results.

When porosities are measured over a range of temperatures for a body it is possible to create a graph to get a visual representation of the body's maturing range. The porosities plotted against temperature produce a line that decreases to a minimum, levels out then typically rises quickly. Some bodies have a fairly broad temperature range at which porosity remains zero, for others it is quite narrow.

Related Information

About to enter boiled weight of a test bar into my insight-live account.

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This is the Testdata Editor window. As soon as I save the entry it will calculate the porosity (absorption) and show it in the ABS column (with the red title) for specimen 7.

Cross section comparison between cone 04 terra cotta and cone 6 iron stoneware

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Both of these bodies have a range of particle sizes (from 42 mesh and finer). The glaze on the cone 04 section (close-up on the left) is very well melted, but its interfacial zone with the body is narrow, it is basically just "stuck on" the surface (so it must be tuned to match the thermal expansion of the body to prevent crazing/shivering). The body is not developing any clearly visible glassy phases, meaning that any strength it has is purely a product of sintering. On the right, the interfacial zone of glaze-with-stoneware-body is wider. The body has incipient melting (tiny feldspar particles are fusing and beginning to dissolve into the surfaces of surrounding ones). The color has changed from red to brown.

One small pinhole in a terra cotta mug and we have a problem

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This is L3724E terra cotta stoneware. The inside slip is L3685S, a frit-fluxed engobe that is hard like the body and attaches well to it (engobes are often insufficiently fluxed). The glaze (G1916Q) is Frit 3195, Frit 3110 and 15% ball clay. The body has about 3% porosity, enough to make very strong pots. However that porosity is still enough to absorb water (and coffee). Although not too visible here, the pinhole in the inner surface has enabled absorption and there is a quarter-sized area of discoloration below the glaze. The piece could possibly be fired a cone higher, but testing would be required to see if the slip is still firing-shrinkage and thermal-expansion compatible with the body and that the body would not be over-fired. A better solution is adjust the firing curve to heal the glaze better. High temperature stoneware can easily have a 3% porosity also, so this is not just a low fire issue.

Cone 2: Where we see the real difference between terra cottas and white bodies

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The terra cotta (red earthenware) body on the upper left is melting, it is way past zero porosity, past vitrified. The red one below it and third one down on the right have 1% porosity (like a stoneware), they are still fairly stable at cone 2. The two at the bottom have higher iron contents and are also 1% porosity. By contrast the buff and white bodies have 10%+ porosities. Terra cotta bodies do not just have high iron content to fire them red, they also have high flux content (e.g. sodium and potassium bearing minerals) that vitrifies them at low temperatures. White burning bodies are white because they are more pure (not only lacking the iron but also the fluxes). The upper right? Barnard slip. It has really high iron but has less fluxes than the terra cottas (having about 3% porosity).

Dried test bars stacked into an electric kiln for firing

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These have already been measured to deduce drying shrinkage. After firing they will be measured again to calculate the firing shrinkage. Then they will be weighed, boiled in water and weighed again to determine the water absorption. Fired shrinkage and absorption are good indicators of body maturity.

A clay that has negative shrinkage during the glaze firing

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It seems impossible but that is what happens with this one at cone 03. This is a native material that was found on the banks of the South Saskatchewan river near Hayes, Alberta (and brought to me for testing). Even when fired to maturity (around cone 2) it still has 10% porosity! This specific sample has even been ball milled for hours and it still does not shrink. And it still feels sandy on the potters wheel. It also has incredible dry strength, the highest I have ever seen. Yet its drying shrinkage is still less than 7% (that of a typical plastic pottery clay). Plus it has very high plasticity. This behavior defies logic, I have found a good explanation.

This pitcher is oozing a black goo after water sat in it overnight

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Even after two weeks it is still sticky. This was purchased at an import store. What could this black goo be? It is likely a sealer that they use to make the porous clay water tight, perhaps an organic sugar. The clay is porous (and thus also weak) because they want to save energy by firing their kilns as low as possible. A water soluble sealer can be OK if the vessel is not used for storage. But it is not OK because there is another problem: The glaze is crazed. That is what is permitting the water to be absorbed into the body. That water is dissolving the sealer and bringing it out. There is yet another issue: The glaze could very well contain lead. Lead makes glazes melt low, so it is a great for saving energy. But not so great for producing safe ware.

A body so porous that it has absorbed its own glaze!

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This unbelievable body is made from dolomite, 65% of it. There is 35% ball clay to give it workability and 5% Ferro frit 3110. The frit stabilizes it so that the fired body does not rehydrate. This has a porosity of 35%! And that porosity is stable across the entire range we have fired it at (cone 06-6). The single-layer on the lower portion has been completely absorbed, the double-layer on the upper is almost gone.

How to stop low fire clays from waterlogging

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Being fired at cone 04, this talc body is quite porous. Water is entering through the unglazed base. During an overnight immersion it penetrated upward to about 1 cm from the rim (and even travelled two-thirds of the way up the handle). So, is this clay and temperature practical for functional ware? Yes. The base can be glazed or siliconed, completely stopping water entry. Heating this in the microwave for an extended period did not fracture it. And even though the mug got incredibly hot the G3879 glaze did not craze - that gives reasonable assurance it will hold up over time. Low-fire bodies have plenty of advantages and they are certainly practical for functional use. Additionally, handmade items deserve common sense care during use (e.g. not leaving pieces in water for extended periods, even hand washing).

Some bodies cannot be fired to even near zero porosity

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Bloating in a high iron raw clay ground to 42 mesh (Plainsman M2). It is still stable, dense and apparently strong at cone 4 (having 1.1% porosity). But at cone 6 (top bar) it is bloating badly. At cone 5 the clay experiences the early stages of bloating. Cone 4 is thus "dangerous territory" for this particular clay. A reminder of this can be seen by putting on a transparent glaze - it fills with clouds of micro-bubbles from off-gassing that has begun well below cone 4.

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