Category: Glaze > Iron > Oil Spot
Created 2017-08-03 08:06:03 by Pieter Mostert
Categories: Glaze > Iron > Oil Spot
Firing Temperature: Δ4
Atmospheres: Oxidation
Surface Type: Glossy
Transparency: Opaque

Average of "Overberg Oilspot (more alumina, more silica) (more MgO less CaO variation)" and "Overberg Oilspot (more alumina, more silica) (less MgO more CaO variation)"

Material Amount Batch Subtotal
Refined Overberg Earthenware 40.5
Frit FSB 510 Na2O 21.5
Talc - Magsil 13.8
Kaolin G (Serina ML Pellets) 7.6
Silica 7
Wollastonite (Theoretical) 6.1
Nepheline Syenite, North Cape 3.6
Total Base:100.1
Red iron oxide 7.7
Total: 107.8

Percentage Analysis

Ingredient Amount SiO2 Al2O3 B2O3 MgO CaO SrO BaO K2O Na2O KNaO Fe2O3 TiO2 LOI
Refined Overberg Earthenware40.523.857.90.280.890.893.690.533.69
Frit FSB 510 Na2O21.59.610.456.192.492.752.75
Talc - Magsil13.88.460.024.310.
Kaolin G (Serina ML Pellets)7.63.542.610.
Wollastonite (Theoretical)
Nepheline Syenite, North Cape3.62.010.880.
Red iron oxide7.77.320.39
100% no LOI 56.5211.636.074.515.

Unity Molecular Formula (UMF)



0.18 Na2O
0.05 K2O
0.36 CaO
0.41 MgO


0.42 Al2O3
0.32 B2O3


3.44 SiO2
0.02 TiO2


0.25 Fe2O3





0.23 : 0.77

SiO2:Al2O3 Chart

Closest 27 neighbors in Glaze > Iron > Oil Spot.

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Stull Chart
SiO2:Al2O3 Ratio
SiO2:Al2O3 Ratio 8.27

Similar Base Recipes

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09/2016 Note: This is a new feature. If a recipe material is not listed, that material's data has not yet been added. Some materials only have GHS ratings, while others only have HMIS ratings. Warnings differ between systems and countries. Glazy does not take any responsibility for accuracy of linked SDS information. Contact your ceramics supplier for safety information for your specific materials.
Globally Harmonized System (GHS) Hazardous Materials Identification System (HMIS) SDS Link
Material Pictograms Signal Word Hazard Statements Health Flammability Hazard Protection
Silica HarmfulHealth Hazard DANGER From 200-Mesh SDS:
May cause cancer by inhalation.
Causes damage to lungs through prolonged or repeated exposure by inhalation.
* 0 0 E
Wollastonite (Theoretical) Health Hazard DANGER Vansil W-30 Wollastonite SDS:
May cause cancer if inhaled.
Causes damage to organs through prolonged or repeated exposure if inhaled. (respiratory tract)
Red iron oxide Health Hazard WARNING May cause damage to lung through prolonged or repeated exposure by inhalation