Crucibles and Base Blocks

COMPOSITION OF CRUCIBLES

Crucibles are manufactured in two basic compositions: the CLAY GRAPHITE-CERAMIC BONDED, and the SILICON CARBIDE CARBON BONDED. Both types utilize the refractory materials, graphite and silicon, as conductors of heat and for structural strength. Graphite is predominant in the composition of the clay graphite crucible, while silicon carbide predominates in the silicon carbide crucible. Due to its higher heat conductivity and greater strength, the silicon carbide crucible is more popular in industry. The less expensive clay graphite crucible is generally used in the School Shop. Crucible failure in School Shops is generally due to mishandling by inexperienced students, so the benefits of the more expensive silicon carbide crucible would not be realized. Either type crucible can be used for melting aluminum, brass, or grey iron. However, different metals should not be melted in the same crucible. This practice will cause contamination of each melt and it will be very difficult to get good castings. If grey iron is to be melted in appreciable quantity, a special clay lined, silicon carbide crucible is recommended. DO NOT use "any size" crucible in your furnace. Use the size for which the furnace was designed.

MIFCO sells all sizes and brands of crucibles available. The crucibles and base blocks listed on this page are sizes that are regularly kept in stock for immediate delivery. If you do not see the size that you need listed here, please give us a call for a competitive quote.

CLAY GRAPHITE CRUCIBLES

Part Number

Description

Approx. Wt.

008195

#4-0000 Standard

1 lb.

008196

#P-3

2 lbs.

008200

#4 Standard

3 lbs.

008201

#6 Standard

5 lbs.

008203

#10 Standard

10 lbs.

008204

#16 Standard

13 lbs.

008205

#20 Standard

15 lbs.

008206

#30 Standard

20 lbs.

008207

#40 Standard

28 lbs.

008208

#50 Standard

36 lbs.

008210

#70 Standard

44 lbs.

 

SILICON CARBIDE CRUCIBLES

Part Number

Unit No./Description

Approx. Wt.

008260

#10 Standard

10 lbs.

008261

#16 Standard

13 lbs.

008262

#20 Standard

15 lbs.

008263

#30 Standard

20 lbs.

008264

#40 Standard

28 lbs.

008265

#50 Standard

36 lbs.

008267

#70 Standard

63 lbs.

008268

#80 Standard

64 lbs.

008269

#90 Standard

65 lbs.

008270

#100 Standard

75 lbs.

008271

#125 Standard

85 lbs.

008272

#150 Standard

95 lbs.

 

SILICON CARBIDE BASE BLOCKS

Part Number

Unit No./Description

Approx. Wt.

008241

6x2 - #10 thru #16

5 lbs.

008242

7x2 - #20 thru #30

6 lbs.

008244

12x2 - #90 thru #100

15 lbs.

008245

12x3 - #80

15 lbs.

008247

7x4 - #20 thru #30

12 lbs.

008243

9x3 - #40 thru #70

15 lbs.

008246

11x4 - #80 thru #150

27 lbs.

008248

14x2 - #250 thru #275

21 lbs.

008249

14x3 - #200 thru #225

21 lbs.

008256

14 x 4 - For DO-600

39 lbs.

008259

16 x 4 - For DO-1000

51 lbs.

008247

16 x 5 - For DO-1000

63 lbs.

 

HIGH ALUMINA BASE BLOCKS

Part Number

Unit No./Description

Approx. Wt.

008401

5x3 - #4 thru #8

8 lbs.

008402

6x2 - #10 thru #16

7 lbs.

008403

7x2 - #20 thru #30

8 lbs.

008405

9x3 - #40 thru #70

17 lbs.

008407

11x4 - #80 thru #150

29 lbs.

008400

 2x1 Base Block for #4-0000 Crucible used with  E4-0 Electric Furnace 1 lb.