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CLAY - DESCRIPTIONS

 

 


 CLAY-TYPE:    BUFF:

FIRING TEMPERATURE: 1050*- 1260* IDEAL AT 1240* GOOD FOR THROWING & GENERAL PURPOSE.

A SMOOTH GREY CLAY.

 


  CLAY-TYPE:    RED-SMOOTH:

 FIRING TEMPERATURE:   1120*- 1140*   IDEAL AT 1120* GOOD FOR THROWING & GENERAL PURPOSE.

 

THIS CLAY CAN FIRE TO 1240* 

 


 

 CLAY-TYPE:    CRANK: (COLOUR-GREY)

 

FIRING TEMPERATURE: 1000* - 1280* IDEAL AT 1240* GOOD FOR HANDBUILDING - COILING - RAKU - TILES -& SCULPTING.

 

*ALSO AN IDEAL CLAY FOR BUILDING A WOOD FIRED PIZZA OVEN IN GREY*

 

 


  CLAY-TYPE:    TOASTED:

 

FIRING TEMPERATURE: 1000* - 1280* IDEAL AT 1240* HAND BUILD - TILES

SCULPTING.

  


 

 CLAY-TYPE:    GROGGED-RED:

 

FIRING TEMPERATURE: 1020*- 1140* IDEAL AT 1240* GOOD FOR HANDBUILDING - COILING - TILES. 

 

*ANOTHER GOOD CLAY FOR BUILDING A WOOD FIRED PIZZA OVEN IN RED*

 


 

  CLAY-TYPE:    EXTRA WHITE STONEWARE:

 

FIRING TEMPERATURE: 1120*- 1260* IDEAL AT 1240* GOOD FOR THROWING & GENERAL PURPOSE.

 


 

   CLAY-TYPE:    OXIDISING ST.THOMAS:

 

FIRING TEMPERATURE: 1150*- 1280* IDEAL AT 1240* GOOD FOR THROWING - HANDBUILDING - & GENERAL PURPOSE.

 


 

  CLAY-TYPE:    GROGGED BUFF:

 

FIRING TEMPERATURE 1050*- 1260* IDEAL AT 1240* GOOD FOR THROWING -GENERAL PURPOSE -TILES - & SCULPTING.

 

LIGHTLY GROGGED GREY CLAY. 


  

  CLAY-TYPE:    GROGGED STONEWARE:

 

FIRING TEMPERATURE: 1230*- 1270* IDEAL AT 1240* GOOD FOR TILES - THROWING & GENERAL PURPOSE.

 

SLIGHTLY TOASTED COLOUR.


 

 CLAY-TYPE:    WHITE EARTHENWARE:

 

 

FIRING TEMPERATURE: 1040*- 1140* IDEAL AT 1120* GOOD FOR THROWING & GENERAL PURPOSE.   

 


   

 


 

EARTHSTONE CLAY DESCRIPTIONS BELOW

Earthstone Clays are slip-house bodies. The slip is prepared in large batches and finely sieved. It is then pumped into filter presses for water removal prior to pugging. This slip-housing process gives the clay body much greater uniformity and virtually guarantees freedom from contamination.

 


 

ORIGINAL WHITE

ES5
(Firing Temp 1180-1280ºC)

Scarva Earthstone Original White matures between 1180°C-1280°C, firing white. It is highly resistant to warping and cracking. The addition of a small proportion of carefully blended and graded molochite means that ES5 Original White throws large pieces easily and responds well to press moulding and slab building. Scarva Earthstone Original White is highly regarded by professional potters.


EXTRA SMOOTH
(Firing Temp 1150-1280ºC)

ES10

 Scarva Earthstone Extra Smooth White matures between 1150 °C-1280°C. This unusually wide range means that it can be high biscuit fired to 1150°C for low temperature earthenware glazes, or biscuit fired at 1000°C for mid-temperature earthenware or stoneware glazes. It throws and casts extremely well and takes sprigged or stamped decoration.

 


Standard Crank
(Firing Temp 1160-1300ºC)

ES50

Sculptors will be delighted with this superb new crank body. It is an open textured, coarsely grogged clay, which still retains tremendous plasticity. It has all the qualities you expect from crank e.g. warp resistance, low shrinkage and excellent green and fired strength. It gives toasted buff in oxidation and a rich, warm speckled orange buff under reduction. Suitable for raku firing.

 


Smooth
Textured Crank
(Firing Temp 1160-1300ºC)

ES60

 

 A fine grogged alternative to our original Crank, offering a finer surface and closer texture. This clay should appeal greatly to hand builders and sculptors who require a warm, plastic clay with excellent green strength, but need a smoother finish than standard cranks can offer. It is suitable for reduction firing, raku etc. Toasted buff in oxidation and warm speckled orange buff under reduction.

 


 

 

Terracotta Crank
(Firing Temp 1080-1220ºC)

ES65

 

Earthstone Terracotta Crank allows you to create large sculptural pieces and is a beautifully textured, richly coloured clay. ES65 Terracotta Crank combines the warmth and excellent working properties of red clay with the strength of a crank, giving an exceptional body that is ideal for all types of hand building processes

 


Smooth
Textured White

(Firing Temp 1180-1290ºC)

ES20

 Scarva Earthstone Smooth Textured White is a particularly versatile clay which matures between 1180-1290°C. It fires white. ES20's low shrink-age means that it is highly resistant to warping, cracking and thermal shock. Earthstone Smooth textured body is particularly suited to throwing large pieces and the addition of specially selected molochite means that it is also excellent for hand building, slab building and coiling.

 


 

Speckled
Stoneware
(Firing Temp 1160-1290ºC)

ES109

A new body using our dry-batching method of production. ES109 is superbly plastic and has an attractive speckle. Made from a mixture of ball clays with medium-textured silica sand.

 

Added for tooth, it willgive a reduction effect when fired in an oxidising atmosphere. This body has been developed for the professional production potter and with good thermal shock properties is excellent for domestic ware.


 


GLACIER
PORCELAIN
(Firing Temp 1280-1300ºC)

ES170

 

Whiteness, glass-like translucency and strength are qualities which attract many potters to porcelain. However, due to the very nature of the raw materials used in their production, most porcelain bodies have very little natural plasticity. In order to overcome this, many manufacturers add ball clay, thus sacrificing the translucency and whiteness. We have discovered that by using high quality, low iron-bearing, china clays, silicas, bentonites and mineral fluxes, it is possible to produce a porcelain which is not only very white,but also translucent and very plastic. Scarva Earthstone Glacier Porcelain - probably the best porcelain body available.

 


 

 

Super White
Raku Body
(Firing Temp 900-1300ºC)

PF520

 

The very best white raku body on the market. With over 58% molochite, this body can withstand the most extreme thermal shock. This is due to both the high alumina plastic ball clay and the three different grades of molochite. This body has very low shrinkage, a medium texture and is highly resistant to warping and cracking.

 



WSG
White Stoneware
Grogged
(Firing Temp 1200-1300ºC)

PF570

 

The same body as Professional WS but with 10% 80's Molochite added WSG is for potters who require a clay with more tooth and ease of drying to aid in the production of larger pieces. The molochite also allows this body

 

 

to be used for small hand built and coiled pots.

 


Architectural
Handbuilding Clay Body
(Firing Temp 1180-1300ºC)

PF610

 

A cheaper alternative to T material this excellent hand building body contains a high percentage of fine to medium molochite. This gives it superb sculptural qualities with very low shrink-age, approximately 6% at 1280ºC. Professional Architectural Hand Building Body is for potters who need a clay that does not warp under extreme conditions. It can be used with confidence to create even the largest pieces.

 


Black Chunky
Sculpture Clay
(Firing Temp 1200-1280ºC)

PF660

  

Black Chunky Sculpture Clay has a beautiful texture and is excellent for big sculptures and murals. It is a strong body with very low shrinkage, good for building rugged sculp-tural forms. It's robust

nature also makes it ideal for architectural ceramics. Black Chunky Sculpture Clay is the clay for everything from large slabs to sculptural work.


Black Textured
(Firing Temp 1080-1260ºC)

PF670

 

Black Textured is good for sculptures, hand building or large thrown pieces. This clay has been spec-ially formulated to fire between 1080 - 1260ºC with very low shrinkage. Its attractive colour and texture give PF670 a very distinctive character.
(Results may vary)

 


Black Smooth
(Firing Temp 1080-1260ºC)

PF680

 

Black Smooth contains a fine grog which gives a close texture to the body and a fine surface to finished pieces. This smooth finish should appeal to hand builders or sculptors who producetile and relief panels or ceramic murals.

PF680 has been formulated to fire between 1080 - 1260ºC.

 


P2 CASTING
PORCELAIN
(Firing Temp 1220-1250ºC)

SP470

 

An economy body giving a high degree of translucency at a slightly lower temperature. Suitable for casting and throwing.

 


SCARVA PAPER CLAY 

 

 

Smooth
(1100°C-1280ºC)

ES200

 

 

Grogged
(1100°C-1280ºC)

ES300

 

 

White
Earthenware Body

(1080°C-1200ºC)

ES400

 

 

Porcelain
Body

(1220°C-1280ºC)

ES600

 

 

Terracotta
(1000°C-1180ºC)

ES800

 

CHUNKY-CRANK

(1100c-1280c)

ES900

 

 


 

CHARACTERISTICS OF FLAXPAPER CLAY

 

These bodies have all the inherent benefits of paper clays, they are strong, flexible, lightweight and have low shrinkage. However, unlike other Paperclays, Scarva FLAXpaperCLAYs have, as an additional benefit, virtually no mould growth.

The addition of flax fibre to clay results in the distribution of extremely fine fibres

 

throughout the body and this serves two basic functions:

 

1 It creates a strong but flexible internal

 

structure in the clay.

 

2 It creates a "capillary system" which

 

transfers moisture easily and evenly

 

throughout the clay.

 

Scarva FLAXpaperCLAY alows the potter to be more of an artist and less of a technician:
Incredibly strong slabs - even extra thin slabs will fold, bend and drape without
tearing.
• Extra large or thick forms hold up under their own weight.
• Greenware re-wets easily and evenly allowing you to re-work, alter or add new clay
at any stage of dryness. It is possible with this clay body to build an armature
and allow it to dry as a support sculpture that need not be removed for firing.
• Moisture evaporates so evenly from this clay body that it can be force dried with
excellent results.


• Exaggerated forms hold their shape. Be careful not to get too extreme: once
bisqued, the fibre structure burns out and slumping may occur if the base-clay is
over fired.
• Greenware - even bone dry - is unbelievably strong and easy to handle or
transport if necessary.
• Make Scarva FLAXpaperCLAY into a putty to repair cracks in greenware or to construct forms out of previously made modules. You may even repair or add to
already bisqued Scarva FLAXpaperCLAY.

 

For best results you should re-bisqueware after making alterations.
• In addition, the burn out of the flax fibres results in a noticeably lower fired
weight, especially in large-scale works and the resulting openness gives improved
thermal shock properties to most clay bodies. Firings can be Oxidised, Reduced,
Raku or Salt and Soda.

 


Tips for using Flaxpaper Clays

 

You may have already tried modifying your existing clay bodies by adding fibres or paper pulp. This is our version utilising finely chopped flax fibres and cellulose in a very forgiving clay body, FLAXpaperCLAYs are ready to use straight from the bag. Time now for you to make new and interesting discoveries using this material!

 

 

Experimenting

 

SCARVA T.S FLAXPAPER CLAY is extremely versatile and can be rolled into slabs, coiled, sculptured or carved. You will notice that it has a different slightly stickier feel, due to the combination of fine ball clays, cellulose and fibres which give good unfired strength. We recommend that you do some preliminary tests, rolling into thin sheets, making coils, pinching, tearing, impressing and carving etc. so that you build up a wide selection of test tiles that can be bisque fired and glazed to earthenware and stoneware temperatures, for future reference. Try allowing a variety of thick and thin slabs to dry on an unvarnished wooden board or tabletop. They can then be cut with a sharp knife and joined instantly by using a slip. Make the slip from dry off-cuts which have been dissolved into a slurry in warm water and then mixed thoroughly.

 

 

Recycling

 

When recycling SCARVA T.S. FLAXPAPER CLAY, or a combination of it and your own clay, it is a good idea to cover your plaster drying batts or plaster moulds with a piece of old cloth sheeting, as FLAXpaperCLAY is stickier than ordinary clays and may adhere to the plaster alone.

 

Firing

 

When firing thick or large flat tiles made from SCARVA T.S. FLAXPAPER CLAY, make sure that they are dried properly before loading them into your kiln. Fire at no more than 30 degrees per hour, up to 400oC, when the fibres and paper will be burnt off, this is one way to avoid the edges curling up.

 

 

Joining to existing work

 

SCARVA T.S. FLAXPAPER CLAY rolled into slabs will not tear easily if it is stretched over hump moulds or other forms made from plaster, wood or cardboard. Once allowed to stiffen, these modules can be joined together using a slurry as described above.

Because SCARVA T.S. FLAXPAPER CLAY body re-wets easily, it is possible to add soft plastic clay over an armature or former made from the same clay, perhaps built from slabs. Spray the dry raw clay under structure with water using a plant sprayer, before scoring the surface a little, using a serrated metal scraper or old fork, paint with a thin slurry, then add the new skin of soft plastic clay.

SCARVA T.S FLAXPAPER CLAY can also be joined to bisque fired clay. First spray the bisque ware lightly with water, then coat the area to be covered with a thin slurry, before adding the soft new clay. These pieces will need to be re-fired to bisque temperature before glazing. Try with one or two old pots to practice these techniques.

 

 

Reinforcing with wire

 

Many makers have searched for a strong, flexible and lightweight clay body for building wall panels or relief. It is now possible to build large, ambitious and complex panels incorporating high temperature wires into the actual structure either to reinforce it or to hang the panels. Please avoid using galvanised wires as they produce dangerous fumes when being fired. Fecralloy and Kanthal wires are available from us, please ask for details.

 


 

THESE ARE DESCRIPTIONS OF SOME OF OUR MOST POPULAR CLAY TYPES.

 

 

WE HAVE MANY MORE CLAY TYPES IF YOU WANT DESCRIPTIONS AND FIRING INFORMATION ON ANY OTHER CLAY THAT IS NOT SHOWN HERE JUST EMAIL OR PHONE US.

 

 


 



 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


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