Crucibles & Slip Cast Items
Our slip casting process produces dense crucibles with fine grained microstructure and less than 1% open porosity.


FLAT BOTTOMED CRUCIBLES
Item Name | Diameter (in) | Height (in) | Solid Volume (cc) | Weight (gms) | Interior Vol. (cc) |
---|---|---|---|---|---|
SC02402 | 0.24 | 0.20 | 0.07 | 0.3 | 0.05 |
SC04008 | 0.40 | 0.79 | 0.9 | 4 | 0.5 |
SC05010 | 0.50 | 1.00 | 2 | 8 | 1 |
SC07116 | 0.71 | 1.57 | 5 | 18 | 5 |
SC07510 | 0.75 | 1.00 | 3 | 13 | 4 |
SC10010 | 1.00 | 1.00 | 4 | 19 | 7 |
SC10012 | 1.00 | 1.25 | 5 | 23 | 9 |
SC10030 | 1.00 | 3.00 | 13 | 51 | 24 |
SC12512 | 1.25 | 1.25 | 8 | 36 | 15 |
SC12520 | 1.25 | 2.00 | 13 | 54 | 25 |
SC12525 | 1.25 | 2.50 | 17 | 66 | 31 |
SC12560 | 1.25 | 6.00 | 41 | 150 | 77 |
SC15020 | 1.50 | 2.00 | 16 | 67 | 38 |
SC15030 | 1.50 | 3.00 | 25 | 97 | 59 |
SC17525 | 1.75 | 2.50 | 24 | 99 | 70 |
SC17535 | 1.75 | 3.50 | 34 | 134 | 99 |
SC20020 | 2.00 | 2.00 | 22 | 97 | 75 |
SC20035 | 2.00 | 3.50 | 39 | 157 | 135 |
SC20050 | 2.00 | 5.00 | 57 | 217 | 195 |
SC20060 | 2.00 | 6.00 | 68 | 257 | 234 |
SC22535 | 2.25 | 3.50 | 44 | 180 | 176 |
SC25030 | 2.50 | 3.00 | 42 | 179 | 189 |
SC25055 | 2.50 | 5.50 | 79 | 306 | 354 |
SC27535 | 2.75 | 3.50 | 63 | 265 | 264 |
SC30030 | 3.00 | 3.00 | 59 | 259 | 272 |
SC30040 | 3.00 | 4.00 | 80 | 330 | 368 |
SC30057 | 3.00 | 5.75 | 116 | 455 | 534 |
SC35060 | 3.50 | 6.00 | 142 | 566 | 782 |
SC40045 | 4.00 | 4.50 | 121 | 518 | 777 |
SC40060 | 4.00 | 6.00 | 163 | 662 | 1044 |
SC45060 | 4.50 | 6.00 | 184 | 761 | 1343 |
SC50050 | 5.00 | 5.00 | 170 | 743 | 1394 |
SC50080 | 5.00 | 8.00 | 275 | 1105 | 2254 |
ROUND TRAYS
Item Name | Diameter | Height | Solid Volume (cc) | Weight (gms) | Interior Vol. (cc) |
---|---|---|---|---|---|
SR1005 | 1.00 | 0.50 | 2 | 11 | 3 |
SR2005 | 2.00 | 0.50 | 4 | 37 | 15 |
SR2010 | 2.00 | 1.00 | 10 | 57 | 35 |
SR3005 | 3.00 | 0.50 | 7 | 82 | 34 |
SR3010 | 3.00 | 1.00 | 18 | 117 | 82 |
SR4005 | 4.00 | 0.50 | 10 | 134 | 64 |
SR4010 | 4.00 | 1.00 | 24 | 182 | 153 |
SR6010 | 6.00 | 1.00 | 40 | 395 | 349 |
SR6012 | 6.00 | 1.25 | 52 | 437 | 453 |
RECTANGULAR TRAYS
Item Name | Width | Length | Height | Solid Volume (cc) | Weight (gms) |
---|---|---|---|---|---|
ST104005 | 1.00 | 4.00 | 0.50 | 12.8 | 44 |
ST106005 | 1.00 | 6.00 | 0.50 | 18.7 | 65 |
ST202005 | 2.00 | 2.00 | 0.50 | 13.5 | 47 |
ST203005 | 2.00 | 3.00 | 0.50 | 21.6 | 74 |
ST204005 | 2.00 | 4.00 | 0.50 | 27.8 | 96 |
ST254005 | 2.50 | 4.00 | 0.50 | 33.2 | 115 |
ST254010 | 2.50 | 4.00 | 1.00 | 47.5 | 164 |
ST256010 | 2.50 | 6.00 | 1.00 | 66.8 | 231 |
ST306010 | 3.00 | 6.00 | 1.00 | 75.7 | 261 |
ST356010 | 3.50 | 6.00 | 1.00 | 95.5 | 329 |
ST404010 | 4.00 | 4.00 | 1.00 | 67.2 | 232 |
ST406010 | 4.00 | 6.00 | 1.00 | 105.6 | 364 |
FLANGED LIDS
Item Name | Diameter | Height | Solid Volume (cc) | Weight (gms) |
---|---|---|---|---|
SF100 | 1.00 | 0.2 | 3 | 10 |
SF125 | 1.25 | 0.2 | 4 | 14 |
SF150 | 1.50 | 0.2 | 6 | 21 |
SF200 | 2.00 | 0.2 | 10 | 35 |
SF250 | 2.50 | 0.2 | 16 | 55 |
SF300 | 3.00 | 0.2 | 23 | 79 |
SF400 | 4.00 | 0.2 | 41 | 141 |
SF450 | 4.50 | 0.2 | 52 | 179 |
SF500 | 5.00 | 0.2 | 64 | 221 |
SF700 | 7.00 | 0.2 | 126 | 435 |
Standard High Density MgO Cast Shapes
These components have been selected as standard sizes for the convenience of our customers. Other sizes and shapes may be in open stock, and any requirements will be quoted on a custom basis. Delivery may not be from open stock. Please contact us for lead times. All dimensions are outside dimensions and may vary +/- 5%. Volumes are in cc's and are only approximate because the wall thickness may vary considerably. Nominal wall is lesser of 5% of diameter or .125 inch. Some warping and sidewall distortion is normal for MgO, especially rectangular shapes. Nominally flat surfaces may be slightly convex or concave. All tray Heights are hand finished and may vary by 25%.Advantages
- Better chemical resistance than alumina in certain applications
- Proven alternative to alumina in testing of slags
- Use temperatures up to +2200 C in specific environments
Uses
- Molten Metal Alloy Processing
- Viable alternative to Al2O3 based ceramics
- Compatible with nickel-based alloys
- Proven performance with plutonium/uranium refining
- High Temp Ceramic Superconductor Materials
- Resistant to attack
- Non-contaminating to 1, 2, 3 materials
- Perovskite structure compatibility
- Piezoelectric Materials Processing
- Resistant to lead based materials
- Helps maintain lead content in PLZT
Design Guides
ABOUT Slip Casting Every part must begin with an aluminum master pattern (positive) of the same shape, but enlarged dimensionally to compensate for process shrinkage. Plaster molds (negatives) are pulled from the master. Multiple molds are needed for each casting run. Many patterns and molds are available. Custom shapes will require set-up charges and sufficient lead time for mold master and mold production. The green parts require drying time, trimming to length, and firing to produce the finished product. SHAPE High Quality MgO Ceramic shapes are made by slip casting. Slip casting is suitable for production of hollow shapes with uniform wall thickness and an opening to the interior. This is ideal for shapes such as crucibles, trays, boats, etc. There should be no re-entrant angles along the longitudinal cross section of the part (such as Ell-shapes, Crosses, etc.). Slip casting will produce a variety of shapes as indicated above. Surface finish does not approximate that of machined surfaces. Nominally flat surfaces, such as lids, crucible and tray bottoms, and plates will be concave or convex after firing. If precision dimensions or flat surfaces are required, additional wet diamond machining is required, and many limitations apply. SIZE The normal fabrication range is for diameters less than 6 inches and lengths less than 12 inches. Larger parts can be made upon request, at some sacrifice in cost and dimensional control. Please inquire for further information. The nominal wall thickness for most shapes is 0.125” (or 3mm), and the maximum thickness available is limited to 0.16 inch (4mm). The wall thickness must be uniform throughout the part. TOLERANCES Unless tighter tolerances are specified, dimensional tolerances for diameters, heights, and lateral dimensions are 0.125 inch or 5%, whichever is less. The nominal wall thickness for standard crucibles varies with the crucible diameter from 0.10" to 0.16". Minimum wall thickness available is approximately 0.060" on small crucibles. Maximum wall thickness that can be produced is approximately 0.20". These tolerances apply to nominal dimensions only, and do not apply to out of round conditions or distortions. Please consult us if dimensional constraints are important so that the tolerances and inspection methods may be clarified. Other visual inspection criteria will be supplied on request. DENSITY Slip cast crucibles exhibit fine grained microstructure and low open porosity. The bulk density is typically a minimum of 3.40 - 3.45 gm/cc, or 92-94% of theoretical. Open porosity is less than 1%. The high density body contains 2% yttrium oxide (Y2O3) content as a sintering aid in direct substitution for MgO content. PURITY All slip cast products are manufactured from high purity fused magnesium oxide grain. A direct substitution of up to 2% Y2O3 is made at the expense of MgO. The Y2O3 promotes sintering and is totally inert and equivalent to MgO in all applications. TYPICAL ANALYSIS BELOW:MgO + Y2O3 | 98.5% |
CaO | 0.5% |
SiO2 | 0.1% |
Al2O3 | 0.55% |
Fe2O3 | 0.06% |
B2O3 | <0.002% |
*Export Control Statement - These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

INTRO:
TATEHO OZARK specializes in magnesia ceramics, but many of our customers also use alumina ceramics for various applications. TATEHO OZARK manufactures 99.5% alumina crucibles and trays in the same sizes and price range as our magnesia products.
What are the Specs? A quick synopsis:
Purity: 99.5% minimum Alumina
Density: > 3.7 gm/cc minimum, typically 3.85 gm/cc. (Theoretical density for Al2O3 is 3.98 gm/cc)
Porosity: Typically 4%, less than 1% open porosity.
Dimensions: Most of the same limitations as for MgO, the normal fabrication range is for diameters less than 5 inches and lengths less than 8 inches.
Wall thickness: As with MgO, the nominal wall thickness for most shapes is 0.125” (or 3mm), and the maximum thickness available is about 0.2 inch (4mm) and the minimum is about 0.08 inch (2mm).
Other: Surface finish may vary, but is usually smooth. Surface is not usually “vitrified”.
Design Guides
The design guides are common to both MgO and Al2O3 slip cast bodies which are made by the same production processes.
ABOUT Slip Casting
Every part must begin with an aluminum master pattern (positive) of the same shape, but enlarged dimensionally to compensate for process shrinkage. Plaster molds (negatives) are pulled from the master. Multiple molds are needed for each casting run.
Many patterns and molds are available. Custom shapes will require set-up charges and sufficient lead time for mold master and mold production. The green parts require drying time, trimming to length, and firing to produce the finished product.
SHAPE
High quality alumina shapes are made by slip casting. Slip casting is suitable for production of hollow shapes with uniform wall thickness and an opening to the interior. This is ideal for shapes such as crucibles, trays, boats, etc. There should be no re-entrant angles along the longitudinal cross section of the part (such as Ell-shapes, Crosses, etc.).
Slip casting will produce a variety of shapes as indicated above. Surface finish does not approximate that of machined surfaces. Nominally flat surfaces, such as lids, crucible and tray bottoms, and plates will be concave or convex after firing. If precision dimensions or flat surfaces are required, additional wet diamond machining is required, and many limitations apply.
SIZE
The normal fabrication range is for diameters less than 5 inches and lengths less than 8 inches. Larger parts can be made upon request, at some sacrifice in cost and dimensional control. Please inquire for further information.
The nominal wall thickness for most shapes is 0.125” (or 3mm), and the maximum thickness available is limited to 0.2 inch (4mm). The wall thickness must be uniform throughout the part.
TOLERANCES
Unless tighter tolerances are specified, dimensional tolerances for diameters, heights, and lateral dimensions are 0.125 inch or 5%, whichever is less. These tolerances apply to nominal dimensions only, and do not apply to out of round conditions or distortions. Please consult us if dimensional constraints are important so that the tolerances and inspection methods may be clarified. Other visual inspection criteria will be supplied on request.
DENSITY
Slip cast crucibles exhibit fine grained microstructure and low open porosity. The bulk density of alumina is typically a minimum of 3.7 gm/cc, or 94% of theoretical. Open porosity is less than 1%.
PURITY
All slip cast alumina products are manufactured from high purity calcined aluminum oxide.
Typical Analysis:
Al2O3 | 99.60% |
CaO | 0.04% |
SiO2 | 0.02% |
MgO | 0.06% |
Fe2O3 | 0.04% |
Na2O | 0.08% |
STRENGTH
Fired alumina parts have reasonably good mechanical strength and reasonably good thermal shock resistance. However, the thin walls limit the mechanical strength and charge weight the crucibles can tolerate. Please consult us with any questions concerning physical properties.