Natronfeldspat LF 90 / LA 75 (Sibelco Germany)

A standard material in Glazecalc's library: its oxide analysis, unity contribution and hazards.

What it is

Kind
Feldspars and stones
Formula
SiO₂ 69.5%, Al₂O₃ 18.8%, Na₂O 10.3%, K₂O 0.3%, CaO 0.9%, Fe₂O₃ 0.05%, LOI 0.4%
Also called
Feldspat NA LF 90, Feldspat Na LF90, Natron-Feldspat LF 90, Sibelco Feldspar LF, Feldspat Natron (Maxum/LA75), Sibelco Feldspar LA, Natronfeldspat (Albit)
Made by
Sibelco (milled in Germany; the selector gives origin DE)
Sold in
EU
Similar materials
Soda Feldspar (Potclays 3427M / Potterycrafts P3317) , Natronfeldspat (Bodmer 549)
Source
Sibelco ceramics product selector, feldspars for bone china (Feldspar LF, origin DE) (2021-06)

Albite soda feldspar from Sibelco's German range, sold by Carl Jäger and BSZ as 'Feldspat Na LF 90' and by Keramik-Kraft as 'Natron (Maxum/LA75)'. It is almost pure albite, so it melts earlier than the Norflux potash feldspar.

Oxide analysis and unity formula

Glazecalc has the analysis of Natronfeldspat LF 90 / LA 75 (Sibelco Germany) as weight percent of the raw material. The unity contribution is the moles of each oxide in the amount of Natronfeldspat LF 90 / LA 75 (Sibelco Germany) that holds 1.0 mole of flux, which is how Glazecalc adds it into a recipe's unity formula.

Oxides in Natronfeldspat LF 90 / LA 75 (Sibelco Germany)
Oxide Weight % Unity contribution
SiO₂69.56.238
Al₂O₃18.80.994
Na₂O10.30.896
K₂O0.30.017
CaO0.90.087
Fe₂O₃0.050.002
Equivalent weight
539.32
Fired weight
537.16
Loss on ignition
0.4%

The equivalent weight is the grams of Natronfeldspat LF 90 / LA 75 (Sibelco Germany) that hold 1.0 mole of flux. The fired weight is what is left of that after firing.

Hazards and safety

Hazards: Carl Jäger's safety data sheet (2012) gives 1-3% quartz; the dust can contain respirable crystalline silica. Avoid breathing it.

Glazecalc shows the hazard wording as its record gives it. It is not a full risk assessment, so read the safety data sheet from your supplier. Before you handle any glaze material, read Safe mixing and ventilation and Glaze safety at home.

Use it in a recipe

Add Natronfeldspat LF 90 / LA 75 (Sibelco Germany) to a recipe in the Glazecalc calculator to see what it does to a glaze's unity formula.

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