Nyad 325 Wollastonite

Alternate Names: Nyad-200 Wollastonite

Oxide	Analysis	Formula
K2O	0.02%	-
TiO2	0.05%	-
MgO	0.15%	-
MnO	0.15%	-
Al2O3	0.40%	-
Fe2O3	0.77%	0.01
SiO2	51.60%	1.03
CaO	46.36%	1.00
LOI	0.50%	n/a
Oxide Weight		119.83
Formula Weight		120.44

Notes

A North American Wollastonite.
This is the Nyad grade used most commonly in ceramic glazes.

Appearance: White
Shape: Acicular
Specific gravity: 2.9
Refractive Index: 1.63
GE Brightness: 90
pH (aqueous solution): 9.9
Water solubility (gms./100cc): 0.0095
Density (lbs./cu.ft.): 181 (2.9 g/cc)
Moh's hardness: 4.5
Coefficient of expansion: (in/in/degree C): 6.5 x 10 -8
Melting point: 1410
on 325# sieve: 1% (Vansil W-30: 0.05%)
Hegman Fineness of Grain: 3 (Vansil W-30: 4)
Median Particle Size: 14
Surface Area (m2/g) (BET): 1.5
LOI (1000C): 0.5% (Vansil: 1.6%)

Related Information

Links

URLs	http://www.nycominerals.com/wollastonite-chemical-composition-chemical-physical-properties Nyad Data Sheet
Materials	Wollastonite
Typecodes	Flux Source Materials that source Na2O, K2O, Li2O, CaO, MgO and other fluxes but are not feldspars or frits. Remember that materials can be flux sources but also perform many other roles. For example, talc is a flux in high temperature glazes, but a matting agent in low temperatures ones. It can also be a flux, a filler and an expansion increaser in bodies.

By Tony Hansen
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