Benwood Talc 2213

Oxide	Analysis	Formula
SiO2	61.50%	1.30
MgO	31.40%	0.99
CaO	0.50%	0.01
Fe2O3	0.60%	-
Al2O3	0.50%	0.01
LOI	5.00%	n/a
Oxide Weight		119.91
Formula Weight		126.22

Notes

As of 2022 Laguna Clay is using this as a substitute in bodies that formerly employed Natural Talc C-98.
While this has only slightly less MgO (the whole reason for using talc), it has much more SiO₂ (61.5 vs 53.5) and a much lower LOI. But most importantly, this has about the same percentage of Fe₂O₃.

If you are using this as a substitute for Texas talc in slip casting bodies it will likely be necessary to adjust the amount of deflocculant and water. You will likely have to read up on deflocculation and be willing to measure specific gravity and make test batches to fine tune a workable recipe. If ware does not have the plastic strength formerly, consider upping the percentage or ball clay (at the cost of non-talc ingredients) or using a more plastic (finer particled) ball clay.

Related Information

Links

URLs	https://www.penpoly.com/app/uploads/2021/07/Benwood-Talc-2213_tds.pdf Benwood 2213 talc data sheet
Materials	Natural Talc C-98
Materials	Talc A source of MgO for ceramic glazes, a flux or thermal expansion additive in clay bodies, also used in the manufacture of cordierite.

By Tony Hansen
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