HPM-20 Volclay Bentonite
Microfine Sodium Bentonite
| SAMG - Surface Area (m2/gm) |
750 |
| P325 - % Passing 325 Mesh Wet |
90% |
| TRMN - Trace Minerals |
feldspar, quartz, calcite, gypsum |
| AVSC - Apparent Viscosity (cps) |
12 cps minimum @ 6.25% solids |
| pHPW - pH for dry powder |
8.5-10.5 @ 2% solids |
| P200 - % Passing 200 Mesh Wet |
97% |
A selectively mined sodium bentonite consisting of micronized particles. It is used as a suspending agent, viscosifier, binder, plasticizer and emulsion stabilizer.
HPM-20 is not really intended for use in ceramics, it has a high iron content and is much more costly (300%+). However, it is so exceedingly fine there is virtually no chance of fired specks (strangely their data sheet shows 3% passing 200 mesh but this is certainly not the case). Other bentonites, like Volcay 325, can have 2% residue on the 325 mesh screen. Also, although this material fires brown, even chocolate brown at higher temperatures, it is extremely plastic compared to white burning bentonites and therefore much less is required. It is ground very fine and presents no fired specking problems in porcelains. If 2% is used it will add 0.1% to the iron content, not usually enough to notice in most whiteware bodies.
Out Bound Links
In Bound Links
XML for Import into INSIGHT
<?xml version="1.0" encoding="UTF-8"?>
<material name="HPM-20 Volclay Bentonite" descrip="Microfine Sodium Bentonite" searchkey="" loi="0.00" casnumber="52623-66-2">
<oxides>
<oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="0.650" tolerance=""/>
<oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="2.670" tolerance=""/>
<oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="2.570" tolerance=""/>
<oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="21.080" tolerance=""/>
<oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="63.020" tolerance=""/>
<oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="3.250" tolerance=""/>
<oxide symbol="FeO" name="Ferrous Oxide" status="" percent="0.350" tolerance=""/>
</oxides>
<volatiles>
<volatile symbol="LOI" name="Loss on Ignition" percent="5.640" tolerance="max"/>
</volatiles>
</material> | 
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