How much Minspar 200 do potters use in a glaze?

Across 418 published glaze recipes containing it, the typical amount is 33% of the dry batch, with half of recipes between 18.4% and 43.8%. Colorants and additives sit far lower than fluxes and glass formers; treat these as a range to test around, not a target.

What cone is Minspar 200 used at?

It appears in recipes across the range; the most common cones among published recipes are cone 6, cone 10, cone 9. Where a material sits depends on the rest of the recipe more than on the material itself.

Is Minspar 200 safe to use?

It carries no specific hazard flag beyond the general rule for all dry ceramic materials: avoid breathing the dust and read the supplier's SDS.

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Glaze material · Fluxes, feldspars & frits

Minspar 200

Also sold as: Minspar

The current soda feldspar, and the standard substitute for Kona F-4.

fluxglass formerstiffens the melt (alumina)Contributes: Na₂O · K₂O · Al₂O₃ · SiO₂

In published recipes

Used in 418 of 10,859 glaze recipes (3.9%)

Typical amount when present

33% of the dry batch — half of recipes fall between 18.4% and 43.8%.

Fired surface of those recipes

Glossy 67% · Semi-glossy 14% · Matte 12% · Satin matte 7%

Cones where it appears

Share of recipes containing this material that fire to each cone.

Most often mixed with

Materials that appear in the same recipes most often.

Silica80%EPK63%Whiting54%Bentonite36%Zinc oxide30%Dolomite28%Ferro frit 313428%Red iron oxide21%

Chemistry

Raw formula: Na₂O·Al₂O₃·6SiO₂
Molecular weight: 524
Fired formula: Na₂O·Al₂O₃·6SiO₂
Equivalent weight: 524
: idealized soda feldspar

From Linda Arbuckle's materials table. Mineral formulas are idealized; buy an analysis for the bag you have. Equivalent weight is the weight that supplies one molecule of the fired oxide — the number glaze calculation uses.

What potters should know

Sodium-fluxed: slightly earlier melting and brighter colour response than potash spar.

Handling and safety

Crystalline silica: the primary respiratory hazard in a ceramic studio (silicosis with chronic exposure). Wet processes, ventilation and a fitted respirator when dry.

Dry ceramic materials generate respirable silica dust. Use a NIOSH-approved N95 or P100 respirator and adequate ventilation when mixing dry, and wet-clean surfaces.

This information is provided for planning purposes and is derived from publicly available sources including OSHA regulations, NIOSH guidance, and manufacturer safety data sheets. It does not constitute professional safety advice. Consult your material suppliers' SDS documents and applicable local regulations for authoritative safety guidance.

Questions

How much Minspar 200 do potters use in a glaze?: Across 418 published glaze recipes containing it, the typical amount is 33% of the dry batch, with half of recipes between 18.4% and 43.8%. Colorants and additives sit far lower than fluxes and glass formers; treat these as a range to test around, not a target.
What cone is Minspar 200 used at?: It appears in recipes across the range; the most common cones among published recipes are cone 6, cone 10, cone 9. Where a material sits depends on the rest of the recipe more than on the material itself.
Is Minspar 200 safe to use?: It carries no specific hazard flag beyond the general rule for all dry ceramic materials: avoid breathing the dust and read the supplier's SDS.

Related materials

Glaze material	recipes	typical
Kona F-4 feldspar	601	32%
Soda feldspar	660	30%

Sources. Usage figures are computed by Claybench over 10,859 glaze recipes compiled from publicly shared community recipe collections (snapshot 2026-02-27) — counts only; no recipe is reproduced, and the figures describe that collection, not every recipe in existence. Material roles and notes are paraphrased from Linda Arbuckle's Ceramic Materials handout unless noted. Hazard notes summarise supplier SDS guidance; read the SDS for the product you buy.

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