Magris Jetfil H 290 Talc

Oxide	Analysis	Formula
SiO2	49.40%	1.02
Al2O3	7.60%	0.09
MgO	32.40%	0.99
CaO	0.30%	0.01
Fe2O3	1.60%	0.01
LOI	11.00%	n/a
Oxide Weight		112.81
Formula Weight		126.75

Notes

2022: Claimed to be a substitute for Texas talc. However its chemistry is quite different. It only has ~2% less MgO but the CaO is 3.5 (vs 0.3), Al₂O₃ is 7.6 (vs 0.5) and SiO₂ is 49.4 (vs 53.5). But the biggest difference is the amount of Fe₂O₃, 1.6% vs <0.5.

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://magristalc.com/ Magris Talc home page
URLs	https://digitalfire.com/4sight/datasheets/PDS-JetWhite-2H-Talc.pdf Magris Jetwhite Talc 2H 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
Follow me on

Got a Question?

Buy me a coffee and we can talk