Percentage Ratio Of Molochite To Clay?

[sine]

Hi could anyone give me idea of ratios for molochite to clay?

For A slip over dry clay?

Thanks A lot

[Sputty]

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[glazenerd]

The maximum I have used in tile bodies (porcelain) was 25%, usually held around 20%. Molochite is on the hydrophobic side: meaning it likes to repel water: which translates to much faster drying times. In mid summer, I have slab rolled tiles, and they have been nearly bone dry 24 hours later.

 

Nerd

[Marcia Selsor]

I would only use it in porcelain. ID use grog for other clays.

Depending on what you are doing 5-25%.

[sine]

Thanks a lot for all of your replies. 

I'm using grogged white stoneware clay for hand building, but wanted to experiment with a less grogged slip brushed on. Hoping for a smoother surface, though not as fine as burnishing would need...

Have sieved out the grog from the clay totally ( for a batch of slip) and about to add a finer molochite to the slip. So was hoping to get advice about ratios of molochite to a batch of powdered clay. 

Thanks a lot, any suggestions appreciated

[Min]

Think you will just have to try some tests with the amounts as suggested as see what you find suits your purposes. 

 

Adding a caveat though, applying slip to dry clay can be a problem. Clay pot has already shrunk, slip hasn’t so when it does it’s likely to crack and peel off the dry clay. You can use a slip made to shrink less to avoid this. This recipe works really well and can go on thin or super  thick and it's very white.  I don’t think you would have any issues adding molochite to it. If you find your bentonite adds specks of colour to it you can sub 5 macaloid for it. 

 

Like everything in ceramics have to run tests.

 

Fish Sauce Slip (up to ^10)

Minspar 23.5%

Grolleg 43.6%

Pyrophyllite 7.8%

Bentonite 9.5%

Silica 15.6%