AO | B1 | CE | F5 | F5-3NO-E1 | FO | G1214M | G1214W | G1214Z | G1215U | G1216L | G1216M | G1916Q | G1947U | G2000 | G2240 | G2571A | G2587 | G2826X | g2851H | G2853B | G2896 | G2902B | G2902D | G2916F | G2926B | G2926J | G2926S | G2928C | G2931H | G2931K | G2931L | G2934 | G2934Y | G3806C | G3838A | G3879 | GA10-A | GA10-B | GA10-D | GA10x-A | GA6-A | GA6-AR | GA6-B | GA6-C | GA6-D | GA6-F | GA6-G | GA6-G1 | GA6-H | GBCG1 | GBCG2 | GC | GR | GR10-A | GR10-B | GR10-C | GR10-E | GR10-G | GR10-J | GR10-J1 | GR10-K1 | GR10-L | GR6-A | GR6-B | GR6-C | GR6-D | GR6-E | GR6-F | GR6-H | GR6-L | GR6-M | GR6-N | L2000 | L3341B | L3500E | L3617A | L3685U | L3724F | L3924C | L3954B | | P3998 | P5283 | TF | VS | WM | ZZ1

L3954N - White/Black Cone 10 Engobe

Modified: 2019-09-18 22:59:45

For Plainsman H550, H450

Material Amount Percent
Nepheline Syenite10.00
Silica20.00
Ball Clay60.00
Zircopax10.00
Bentonite2.00
102.00

Notes

This is the product of a series of tests where the percentage of nepheline syenite was progressively reduced (from 25% originally) to reduce the firing shrinkage of H550 (it is important that engobes shrink the same as the body or they will flake or crack off during firing or later during ware use). Amazingly only 10% nepheline syenite is needed to make this fit Plainsman H450, H550. Do not use this recipe on porcelains or whitewares (e.g. H570, P600), the recipe needs more nepheline for them (to increase firing shrinkage, we have another recipe, L3954J that does this).

This engobe is very plastic so it sticks well to leather hard clay.

The zircopax makes this fire quite white. If you want black, switch it to 5-10% Mason 6600. Be careful with other stains, some of them will flux and increase the fired shrinkage.

To mix this follow the instructions on using an engobe at the Digitalfire Reference Library.

Related Information

Transparent and RavenTalc silky matte glazes on black engobe at cone 10R

Clay is Plainsman H450. The L3954N black engobe was applied at leather hard stage (on the insides and partway down the outside). The G1947U clear glossy glaze over it on the inside produces a deep and vibrant hue (left). The inside glaze on the right is GR10-C Ravenscrag silky matte. The outsides are GR10-J Ravenscrag Dolomite matte with a little added cobalt and iron (for blue and brown).

Two G2571A Bamboo color versions at cone 10R

These mugs are Plainsman H450. Both have a black engobe (L3954N) applied to the insides and half way down the outside during leather hard stage (the insides are glazed with Ravenscrag silky matte and G1947U over the black engobe). The bamboo glazes can thus be seen over the black (upper half) and the raw buff body (lower). The bamboo glaze on the left has 1% iron added to the base G2571A recipe. The one on the right has 3.5% powdered rutile and 10% zircopax added.

L3954J black engobe on a cone 10 whiteware body

The body is Plainsman H570 (0.5-1% porosity). Notice the EBCT (engobe compatibility) test bars in front. These sandwich the body and the engobe together in a thin strip, differences in fired shrinkage curl the bar during firing (toward the higher shrinker). The straighter the bars fire the better the fit. My regular engobe for use on our buff stoneware, L3954N (Plainsman H550, 2-3% porosity), has lower fired shrinkage than this (since that body is less vitreous). This one increases the shrinkage (with 5% more nepheline syenite, 5% less silica and 3% less ball clay). This employs 10% Mason 6600 stain to produce the jet-black fired product.

Links

Glossary Engobe
Engobes are high-clay slurries that are applied to leather hard or dry ceramics and fire opaque. They are used for functional or decorative purposes.

XML to Paste Into Desktop Insight

<recipes>XML not functional: We are working on this problem.</recipes>

By Tony Hansen


Tell Us How to Improve This Page

Or ask a question and we will alter this page to better answer it.

Email Address

Name

Subject

Message


Upload picture


Copyright 2008, 2015, 2017 https://digitalfire.com, All Rights Reserved