High Fire Glazes


1100 Series Stoneware Glazes

We offer a selection of 79 cone 4/6 Stoneware Glazes. All of these glazes are lead-free and dinnerware safe. Most of them also come with the A/P non-toxic rating from the Art & Creative Materials Institute (ACMI) which is clearly marked on the product label. Some of the reactive type glazes are rated C/L by the ACMI which means that they are considered toxic in the liquid (unfired) state due to the presence of heavy metals, such as copper or vanadium, beyond the non-toxic legal limit. C/L rated glazes are not suitable for use by young children or pregnant women.

We have 3 types of Stoneware Glazes: clear glazes; plain colored glazes; and reactive glazes. These are described in more detail below. In general, clear glazes are used to cover designs created with underglazes. There is a choice of gloss, satin or crackle finishes. Our plain colored glazes are opaque and come in gloss and satin finishes. Some of our most popular stoneware glazes are the reactive colors which produce multi-tone and multi-colored effects by the combination of various metal oxides. Many other interesting effects can be created by layering these reactive glazes. In particular, layering a more fluid glaze, such as 1173, underneath or on top of one of the other reactive glazes often produces beautiful results.

All of our Stoneware Glazes are available wet in pints and gallons. They are also available dry in 10 lb. bags. The wet glazes are set up for brushing application. The dry glazes are set up for dipping application. For dry glaze mixing instructions see the sheet on "Dry Glaze Mixing Instructions" towards the end of this Product Guide. Please follow the instructions carefully especially with respect to the amount of water required.

CLEAR GLAZES
1100 - Clear Gloss Glaze (cone 4/6) – An excellent lead free, A/P non-toxic, dinnerware safe stoneware clear gloss glaze which is compatible with most commercially available underglazes. Like most clear glazes 1100 - works best when applied thinly.

1120 - Clear Satin Glaze (cone 4/6) – Also lead free, A/P non-toxic, dinnerware safe and suitable for use over underglaze decoration. Satin clear glazes are not as translucent as clear gloss glazes and will tend to mute the appearance of underglaze decoration somewhat. It should be kept thin (i.e. 1 or 2 coats by brushing) to improve clarity.

1187 - Clear Crackle Glaze (cone 4/6) – A lead free, A/P non-toxic clear crackle glaze. After the piece has been removed from the kiln and allowed to cool the crackle pattern will form. A colored dye can be rubbed into the surface to emphasize the crackle pattern. Crackle glazes are not considered dinnerware safe due to the possibility of bacteria growth in the cracks.

PLAIN COLORED GLAZES
Opaque Gloss Glazes – 1101, 1102, 1103, 1106, 1107, 1108, 1109, 1110, 1118, 1131, 1132, 1134, 1135, 1136, 1137, 1138, 1151, 1164, 1165, 1166, 1167, 1168, 1169, 1184, 1185, 1186, 1193, 1194, 1195, 1196. – A beautiful selection of lead free, A/P non-toxic, dinnerware safe stoneware glazes with particular emphasis on bright primary colors. Opaque Satin Glazes – 1121, 1122, 1123, 1124, 1125, 1126, 1127. – Smooth satin finish on these stoneware glazes which are also lead free, A/P non-toxic and dinnerware safe. Metallic Glaze – 1188 Pewter has a beautiful metallic finish. Please note that it is lead free, but not dinnerware safe or non-toxic because of the presence of a large amount of other metallic oxides.

REACTIVE GLAZES
Reactive Glazes – 1113, 1115, 1117, 1129, 1140, 1141, 1142, 1143, 1144, 1145, 1155, 1156, 1170, 1171, 1174, 1175, 1176, 1177, 1178, 1179, 1180, 1181, 1182, 1183, 1191, 1192. – Are all lead free, non-toxic and dinnerware safe. They are formulated to produce reactions during the firing cycle which give very interesting and beautiful effects. The final appearance of the glaze is dependent on firing temperature, glaze thickness and the composition of the clay body being used. The same glaze can look quite different on different clay bodies. The samples shown on the color charts are 3 brush coats of glaze fired to cone 5 in an electric kiln on a white clay body. Different results should be expected in reduction.

Reactive Glazes – 1111, 1148, 1152, 1153, 1154, 1157, 1158, 1159, 1161, 1162, 1172, 1173. – Are all lead free but they exceed the vanadium and/or copper threshold limit in the liquid unfired state and therefore are not non-toxic. However, they are all food safe if fired to the proper firing temperature. They behave in the manner described above for Reactive Glazes. Also be aware that some of the colors, such as 1148, 1152, 1153, 1154, 1158, 1159, 1161, 1162, and particularly 1173 are more fluid and may run. Be more careful when using them on vertical surfaces. Use fewer coats towards the bottom of the piece.


1200 High Temperature Glazes

CLEAR GLAZES
1200 - Clear Gloss Glaze (cone 9/10) – Clear gloss glaze appropriate for use at cone 9/10. Lead free, dinnerware safe, and A/P non-toxic.

1201 - Clear Satin Crackle Glaze (cone 9/10) – Clear satin glaze which will crackle on most cone 9/10 clay bodies. Lead free and A/P non-toxic. Crackle glazes are not considered dinnerware safe due to the possibility of bacteria growth in the cracks.

PLAIN COLORED GLAZES
Opaque Gloss Glazes – 1206, 1207, 1208, 1209, 1210, 1215, 1226, 1229, 1240, 1241, 1242, 1243, 1244, 1245, 1254, 1270, 1271, 1272, 1273, 1274, 1275. – Lead free, non-toxic and dinnerware safe range of beautiful opaque gloss glazes.

Opaque Satin Glazes – 1203, 1225, 1231, 1237, 1248, 1251. – Lead free, A/P non-toxic and dinnerware safe glazes that give a smooth satin finish at cone 9/10.

REACTIVE GLAZES
Reactive Glazes –1220, 1221, 1227, 1230, 1233, 1235, 1252, 1253. – Lead free, A/P non-toxic, dinnerware safe glazes are similar in usage to the cone 4/6 reactive glazes but are for use at cone 9/10.

Reactive Glazes – 1205,1222, 1228, 1234, 1256, 1257, 1258, 1259, 1260, 1261, 1262, 1263, 1264, 1265, 1266, 1267, 1269. – Are all lead free and dinnerware safe but they exceed the vanadium threshold limit in the liquid unfired state and therefore are not non-toxic. However they are all food safe if fired to the proper firing temperature. They are also similar in usage to the cone 4/6 reactive glazes but are for use at cone 9/10.


1500 Series Nova Stoneware Dipping Glazes

The NOVA line of Stoneware Dipping Glazes consists of a selection of 27 cone 4/6 glazes available wet or dry in 1, 3 and 5 gallon buckets. In dry form the buckets contain 7 1/2 lb, 25 lb. and 40 lb. of dry glaze, respectively. The main difference between the NOVA series and our 1100 series Stoneware Glazes is that the NOVA series glazes are all set up for dipping rather than brushing. This means they have almost no gum in them and will dry much faster than brushing glazes. They are also formulated mainly from raw materials, such as kaolin, feldspar, wollastonite, oxides, etc. rather than the frits and ceramic stains that we use in the 1100 series. There are two significant benefits from using raw materials. First, they are less expensive which leads to more economical pricing. Second, raw materials are less dense than frits and stains which makes them easier to suspend in water. The NOVA glazes are much more tolerant to being mixed with excessive water and will very rarely settle out in the way that the 1100 series does. However, it is still important to follow the mixing instructions that come with the dry glaze in order to have the glaze set up correctly for dipping.

Remove the lid and add water to the powdered glaze. For a 7.5 lb. pail add 4 pints (0.5 gallons), for a 25 lb. pail add 14 pints (1.75 gallons) and for a 40 lb. pail add 22 pints (2.75 gallons) of water to the pail. Close the lid firmly and shake vigorously until all the powder has been wetted. Remove the lid. Then, using a proper mechanical mixer such as a jiffy mixer or a drill with a mixing attachment, thoroughly mix the glaze. Add up to a pint more of water, as you are mixing, to achieve your desired viscosity. After mixing strain glaze through an 80 mesh sieve.

NOVA dipping glazes can be thinned with water. For detailed suggestions regarding how to adjust the set up of a dipping glaze please see the section in our Product Guide titled “Guide to Adjusting Glaze Viscosity and Density”.

CLEAR GLAZES
1500 - Clear Gloss Glaze (cone 4/6) – An excellent lead free, A/P non-toxic, dinnerware safe stoneware clear gloss glaze which is compatible with most commercially available underglazes.
1501 - Clear Crackle Glaze (cone 4/6) – A lead free, A/P non-toxic clear crackle glaze. After the piece has been removed from the kiln and allowed to cool the crackle pattern will form. A colored dye can be rubbed into the surface to emphasize the crackle pattern. Crackle glazes are not considered dinnerware safe due to the possibility of bacteria growth in the cracks.
1502 - Clear Satin Glaze (cone 4/6) – Also lead free, A/P non-toxic, dinnerware safe and suitable for use over underglaze decoration. Satin clear glazes are not as translucent as clear gloss glazes and will tend to mute the appearance of underglaze decoration somewhat.

PLAIN COLORED GLAZES
Opaque Gloss Glazes – 1510, 1511, 1512, 1513, 1514 and 1515 – A selection of lead free, non-toxic, dinnerware safe stoneware glazes.

Opaque Satin Glazes –1540 and 1541– Smooth satin finish on these stoneware glazes which are also lead free, non-toxic and dinnerware safe.

REACTIVE GLAZES
Soft Reactive Glazes – 1520, 1521, 1522, 1523, 1524 and 1525 – Are all lead free and dinnerware safe. They are formulated to produce reactions during the firing cycle which give beautiful effects, particularly when applied in a thin layer underneath one of the Regular Reactive Glazes listed below. Please be aware that these glazes are more fluid and may run particularly when glazes are applied thickly. Be more careful when using them on vertical surfaces. Use a thinner coating of glaze towards the bottom of the piece.

Regular Reactive Glazes – 1530, 1531, 1532, 1533, 1534, 1535, 1536, 1537, 1538 and 1539 – Are all lead free and dinnerware safe. The final appearance of the glaze is dependent on firing temperature, glaze thickness and the composition of the clay body being used. The same glaze can look quite different on different clay bodies. The samples shown on the color charts are one dipping application of glaze fired to cone 5 in an electric kiln on a white clay body. Different results may be experienced in reduction.