BCS

Foundry Crucibles

 


Description:
A crucible is a container use to hold metal for melting in a furnace. BCS offers Bartley Crucible & Refractory (Bilge Shaped) Clay-Graphite crucibles, Vesuvius Tercod (tm) (Bilge Shaped) Silicon-Carbide crucibles and low cost "A" shaped crucibles.


What It Does:
A crucible is needed to withstand the extreme temperatures encountered in melting metals. The crucible material must have a much higher melting point than that of the metal being melted and it must have good strength even when white hot. 

It is possible to use a home made steel crucible to melt metals such as zinc and aluminum, because these metals melt at a temperature well below that of steel. However scaling (flaking) of a steel crucible interior surface is a problem. This scale can contaminate the melt and thin the crucible walls rather quickly. These crucibles can be coated with Marcote-7 or with "Black Silk Liquid Carbon"provide some degree of protection between the steel and the metal being melted. Steel crucibles will work if you are just getting started and don't mind dealing with the scaling.

Common refractory materials used in crucible construction are clay-graphite, and carbon bonded silicon-carbide. These materials can withstand the highest temperatures in typical foundry work. Silicon carbide has the added advantage of being a very durable material.

Our Clay Graphite Bilge Shape crucibles are rated for 2750 F (1510 C). The "A" shaped crucibles are useful for metals up to 2000 F (1093C). All of our crucibles are designed for "non-ferrous" work. Nonferrous means containing no iron. They will handle zinc, aluminum, brass / bronze, silver and gold alloys.


Crucible Shapes:

"Bilge" Shape: Our Clay Graphite Bilge and Silicon Carbide Bilge crucibles are of high the highest quality and are used commercially.

A bilge shaped crucible is shaped like a barrel. A rule of thumb states that the # of a "bilge" crucible gives its approximate working capacity in pounds of aluminum. For brass or bronze use 3 times the crucible #. For example a #10 crucible would hold approximately 10 pounds of aluminum and 30 pounds of brass. This is only applicable for "bilge" shapes.

The "Bilge"shape silicon carbide crucibles are a carbon bonded silicon carbide having the longest service life.

"A" Shape: Our "A" shape crucibles are typically used by hobbiests and casual casters. This shape is easier to make than the bilge shape and therefore is lower cost. Also note that "A" shape sizes and capacities don't correspond to bilge shape sizes and capacities. "A" Shape crucibles are rated in Kg of brass. Therefore a #10A will hold about 10 Kg / 22 Lbs of brass.

Check the tables below to find the right size for your job. These crucibles run smaller than the equivalent bilge style. Get the next size up when in doubt.

I've got to admit that the "A Shape" crucibles are a bit "rough" around the edges. The surface finish is somewhat coarse and there are dents and dings in the rims and body. They don't have as finished an appearance as the bilge types, but in view of the price difference I would be inclined to overlook this issue. This roughness doesn't detract from their performance in any way.

These "A" shape crucibles are formed from what appears to be clay, fire clay grog and a smattering of silicon carbide particles.


How To Use It:

All crucibles should be handled with properly fitting tongs (lifting tool). Improper tongs can cause damage or complete failure of a crucible at the worst possible time.

A disk of cardboard can be placed between the crucible and the furnace base prior to heating. This will burn off, leaving a layer of carbon in between and prevent the crucible from sticking to the furnace bottom. A coating of Plumbago (Carbon Black) does the same thing.

It is best to use a different crucible for each type of metal to avoid contamination. Also be sure to completely empty the crucible after use. Metal left to solidify in a crucible can expand on re-heating and destroy it.

Please temper new crucibles or those that have been in storage. Heat the empty crucible for 2 hours at 220 F (104 C). (Use adequate ventilation. New crucibles will smoke as the glaze sets.) Then fire the empty crucible to a red heat. Allow the crucible to cool to room temperature in the furnace before use. This procedure should be followed for ALL new crucibles and for any crucible that may have been exposed to damp conditions in storage.

Store all crucibles in a dry area. Moisture can cause a crucible to crack on heating. If it has been in storage for a while it is best to repeat the tempering.

The material should be placed into the crucible VERY loosely. NEVER "pack" a crucible, as the material will expand on heating and can crack the ceramic. Once this material has melted into a "heel", carefully load more material into the puddle for melting. (WARNING: If ANY moisture is present on the new material a steam EXPLOSION will occur). Once again, don't tightly pack in the metal. Keep feeding the material into the melt until the required quantity has been melted.


PLEASE NOTE THAT THE DIMENSIONS SHOWN ARE APPROXIMATE.
ALL CRUCIBLES VARY IN SIZE FROM LOT TO LOT.
PLEASE CALL IF YOU NEED EXACT DIMENSIONS FOR A SPECIFIC CRUCIBLE.

"A" Shape Crucibles

"A" Shape

APPROXIMATE Standard Dimensions & Capacities (inches)

Crucible Size

Height

Top Diameter

Bottom Diameter

Pounds of Aluminum

Pounds of Brass

A0

2 1/2

2 1/2

1 1/8

.7

2.2

A1

3

3

2 5/8

.7

2.2

A2

3 3/4

3

2 3/4

1.4

4.4

A4

4 7/8

4 1/2

3 1/8

2.9

8.8

A6

5 1/2

5

3 5/8

4.2

13.2

A8

6 7/8

5 3/4

4

5.6

17.6

A20

9

8

4 3/4

14

44



Clay-Graphite Crucibles

"Bilge" Shape

Standard Dimensions & Capacities (inches)

Crucible Size

Height

Top Diameter

Bilge Diameter

Bottom Diameter

Pounds of Aluminum

Pounds of Brass

B0000

3 1/16

2 5/8

 

1 7/8

.46

1.46

B1

3 13/16

3 5/16

 

2 3/8

1

3.2

B2

4 1/2

3 7/8

 

2 7/8

2

6.4

B3
5 3/16
4 3/8   3 1/16 3 9.6

B4

5 1/2

4 3/4

 

3 5/16

4

12.7

B6

6 3/4

5 9/16

 

3 7/8

6

19.1

B8

7 3/16

5 7/8

 

4 1/2

8

25.5

B10

8 1/16

6 1/4

6 5/8

4 7/8

10

31.9

B16

9 5/16

7 1/8

7 3/8

5 1/2

16

51.0





Silicon-Carbide Crucibles

"Bilge" Shape

Standard Dimensions & Capacities (inches)

Crucible Size

Height

Top Diameter

Bilge Diameter

Bottom Diameter

Pounds of Aluminum

Pounds of Brass

B4

5 3/4

4 3/4

4 3/4

3 1/8

4

12.7

B6

6 9/16

5 3/8

5 3/8

3 3/4

6

19.1

B8

7 3/16

6 1/16

6 1/16

4 1/16

8

25.5

B10

8 1/8

6

6 9/16

4 5/8

10

31.9

B20

10 1/8

7 13/16

8 1/2

6 1/8

20

63.7

B30

11 1/2

8 11/16

9 1/2

6 13/16

30

95.6

 



Health Info:

MSDS:

"A" shape Clay Graphite crucible MSDS

"Bilge" shape SiC crucible MSDS

"Bilge" shape Clay Graphite crucible MSDS


Tech Data:

"A" shape crucible Tech Data

"Bilge" shape SiC crucible Tech Data

"Bilge" shape Clay Graphite crucible Tech Data


Ordering Info:

FREE SHIPPING ON ALL ITEMS!
(In the lower 48 states)

Item
Size
Type
Shape
Price
 
#5000
B0000
Clay-Graphite
Bilge
$35.50

#5002
A0
Clay-Graphite
A
$22.00

           
#5010
B1
Clay-Graphite
Bilge
$41.50

#5012
A1
Clay
A
$24.00

           
#5020
B2
Clay-Graphite
Bilge
$44.50

#5022
A2
Clay
A
$25.50

           
#5030
B3
Clay-Graphite
Bilge
$49.50

           
#5040
B4
Clay-Graphite
Bilge
$55.00

#5041
B4
Silicon-Carbide
Bilge
$144.00

#5042
A4
Clay
A
$30.00

           
#5060
B6
Clay-Graphite
Bilge
$64.10

#5061
B6
Silicon-Carbide
Bilge
$145.50
Out of Stock
#5062
A6
Clay
A
$34.00

           
#5080
B8
Clay-Graphite
Bilge
$78.50

#5081
B8
Silicon-Carbide
Bilge
$157.00

#5082
A8
Clay
A
$35.50

           
#5100
B10
Clay-Graphite
Bilge
$99.50

#5101
B10
Silicon-Carbide
Bilge
$160.00

           
#5160
B16
Clay-Graphite
Bilge
$118.00

           
#5202
A20
Clay
A
$64.25

           
#5400
B40
Clay Graphite
Bilge
$245.00

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Copyright 2002 - 2014 Budget Casting Supply LLC. All rights reserved.
Revised: 3-26-14