Category: Glaze > Clear
Created 2015-07-23 09:23:27 by Glazy Admin
Categories: Glaze > Clear
Firing Temperature: Δ6
Atmospheres: Oxidation
Surface Type: Glossy

Source/Alternate names: Paul Lewing

Notes: Alisa Clausen: Clear, stable, shiny gloss. No noticeable differences where double dipped. Some crystals where especially thick
under rim. Nice. Same recipe tested with 8 Colemanite for Gerstley Borate, no discernable difference, except colemanite version had a
very small bluish pool in test bowl center. I think this sub. works.

Material Amount Batch Subtotal
Custer Feldspar 27
Whiting 21
Silica 18
Frit 3134 9
Talc (Theoretical) 8
Gerstley Borate 8
Total: 100

Percentage Analysis

Ingredient Amount SiO2 Al2O3 B2O3 MgO CaO K2O Na2O KNaO P2O5 Fe2O3 TiO2 LOI
Custer Feldspar2718.54.590.082.70.813.510.030.08
Frit 313494.192.081.810.920.92
Talc (Theoretical)85.072.550.38
Gerstley Borate81.
100% no LOI

Unity Molecular Formula (UMF)



0.08 Na2O
0.07 K2O
0.67 CaO
0.17 MgO


0.2 Al2O3
0.15 B2O3


2.1 SiO2





0.16 : 0.84

SiO2:Al2O3 Chart

Closest 100 neighbors in Glaze > Clear.

Click and drag to zoom
Stull Chart
SiO2:Al2O3 Ratio
SiO2:Al2O3 Ratio 10.77

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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
Custer Feldspar HarmfulHealth Hazard WARNING May cause damage to lungs through prolonged or repeated inhalation.
Suspected of causing cancer through
prolonged or repeated inhalation.
May cause allergy or asthma symptoms or breathing difficulties if inhaled.
May cause skin or eye irritation.
Whiting Harmful WARNING Causes eye irritation
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
EPK HarmfulHealth Hazard DANGER EPK Kaolin is a naturally occurring mineral, which may contain amounts of crystalline silica
typically 0.1-1.0%, may cause damage to respiratory system through prolonged or repeated
1 0 0 E
Talc (Theoretical) Harmful WARNING Causes mild skin irritation
Harmful if inhaled
May cause respiratory irritation
1 0 0 E
Gerstley Borate