May 2026: We are continuing a major code rewrite. Please contact us if you find issues. Thank you.

Materials for Ceramics

1-9 | A | B | C | D | E | F | Frits | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

G-40 Feldspar

Description: Potash/sodium/calcium Feldspar

Oxide	Analysis	Formula
CaO	0.80%	0.08
MgO	0.05%	0.01
K2O	10.40%	0.63
Na2O	3.00%	0.28
Al2O3	18.00%	1.01
SiO2	67.56%	6.45
Fe2O3	0.08%	-
LOI	0.16%	n/a
Oxide Weight		573.12
Formula Weight		574.04

Notes

G-40 is a potassium / sodium / calcium aluminum silicate used as a source of alumina and potash in specialized glass batch formulations requiring higher potassium levels. Carefully beneficiated using the froth flotation process, G-40 Feldspar offers low iron oxide and high alkali oxide content per unit of alumina.

Related Information

Links

URLs	http://www.zemex.com/feldspar/g40spar.html G40 Data Sheet
Materials	G-20 Feldspar
Materials	Potash Feldspar A feldspar having a KNaO content that predominates in potassium.
Typecodes	Feldspar The most common source of fluxes for high and medium temperature glazes and bodies.

Data

Bulk Density lbs/cu. ft. (Packed)	90
Sieve Analysis Dry	+30 mesh: tr +40 mesh: 0.3 +200 mesh: 94.8

PayPal

No tracking, No ads, No paywall, No transient content!
Just organized, concise information constantly updated and improved.
Was this helpful? Consider supporting me.

By Tony Hansen
Follow me on

Got a Question?

Buy me a coffee and we can talk