Current Industrial Reports U.S. Department of Commerce Economics and Statistical Administration Bureau of the Census Refractories - 1997 MA32C(97)-1 Issued October 5, 1998 Information about the scope of the survey, methodology, explanation of terms, and historical notes for this survey may be found in the introduction of the 1996 Manufacturing Profiles, issued July 1998. These data are also available through the U.S. Department of Commerce and STAT-USA Electronic Bulletin Board by subscription. To access, dial (202) 482-3870 and follow the prompts to register. Also, you may call 202-482-1986 or 1-800-STAT-USA, for further information. The Internet address is stat-usa.gov/. For mail or fax copies of the publication, contact the Manufacturing and Construction Division Information Center, 301-457-4673. Address inquiries concerning these data to U.S. Department of Commerce, Bureau of the Census, Manufacturing and Construction Division, Washington, DC 20233, or call Evelyn Jordan, 301-457-4788. Table 1. Value of Shipments of Refractories: 1987 to 1997 [Thousands of Dollars] Year Total Clay Nonclay 1997....................... 2,403,518 967,640 1,435,878 1996....................... 2,340,757 930,006 1,410,751 1995....................... 2,222,384 940,835 1,281,549 1994....................... 2,046,979 906,165 1,140,814 1993....................... 1,930,233 772,986 1,157,247 1992....................... 1,956,083 786,078 1,170,005 1991....................... 1,946,842 784,331 1,162,511 1990....................... 2,002,833 771,315 1,231,518 1989....................... 2,010,947 823,266 1,187,681 1988....................... 1,950,032 813,739 1,136,293 1987....................... 1,682,338 739,770 942,568 Table 2a. Quantity and Value of Shipments of Refractories by Type: 1997 [Value in thousands of dollars] Quantity shipped (unit of measure) Product description M bricks No. (1,000 Value Product of Short Metric 9-inch of code cos. tons tons equivalent) shipments Clay and nonclay refractories..................... (X) (X) (X) (X) 2,403,518 3255- -- Clay refractories............................... (X) (X) (X) (X) 967,640 Brick and shapes.............................. (X) 904,544 820,077 273,113 555,492 32550 11 Fireclay, including semi-silica, bloating and superduty fireclay brick and shapes, fireclay and high alumina pouring pit refractories, clay kiln furniture, radiant heater elements, and other miscellaneous clay refractory shapes.......................... 31 433,398 392,927 130,555 179,505 32550 14 High alumina brick and shapes containing 50% alumina and over, including glass house pots, tank blocks, feeder parts, and upper structure shapes, made predominately of calcined bauxite, kyanite, andalusite, and similar raw materials 1/............................... 34 417,153 378,199 101,370 317,722 32550 35 Insulating brick and shapes................. 13 53,993 48,951 41,188 58,265 Unshaped clay refractories.................... (X) 740,295 671,164 (X) 355,051 32550 55 Refractory bonding mortars, wet and dry, including clay and high alumina....... 32 65,110 59,030 (X) 30,464 32550 61 Plastic refractories and ramming mixes less than 50% alumina, high alumina plastic refractories and ramming mixes 50% alumina and over, and high alumina phosphate bonded plastic and ramming mixes 50% alumina and over 2/... 27 153,229 138,920 (X) 76,661 32550 65 Castable refractories less than 50% alumina, high alumina castables 50% and over, and insulating castables (hydraulic setting) density up to 105 lbs./cubic foot 3/..................... 38 343,960 311,840 (X) 184,800 32550 70 Fireclay gunning mixes, including hydraulic setting gunning mixes, less than 505 alumina, high alumina gunning mixes, 50% alumina and over, and insulating gunning mixes (hydraulic setting)................................... 31 177,996 161,374 (X) 63,126 Other refractory raw materials and refractory materials sold in lump or ground form either for direct use by customer as a finished refractory product or as exported material.............. (X) 206,760 187,452 (X) 28,913 32550 85 Clay and high alumina refractory raw materials 4/............................... 18 196,889 178,503 (X) 26,712 32550 95 Clay and high alumina refractory materials 5/............................... 10 9,871 8,949 (X) 2,201 32550 00 Clay refractories n.s.k. 6/................... (X) (X) (X) (X) 28,184 3297- -- Nonclay refractories............................ (X) (X) (X) (X) 1,435,878 Brick and shapes.............................. (X) 508,120 460,670 111,897 794,548 32970 12 All silica bricks and shapes, excluding semi-silica................................ 17 43,614 39,541 20,473 67,384 32970 13 Magnesite-carbon brick and shapes, both less than 7% carbon, 7% carbon and over, predominately pitch and resin bonded, and carbon magnesite brick...................................... 9 111,096 100,722 20,721 115,731 32970 15 Magnesite brick and shapes, burned and unburned................................... 10 31,023 28,126 5,769 24,400 32970 19 Magnesite-chrome, chrome-magnesite, including high fires, burned and unburned brick, and chrome brick........... 6 57,948 52,537 10,478 59,701 32970 48 Silicon carbide brick and shapes made predominately of silicon carbide, including kiln furniture................... 16 20,053 18,180 4,714 84,171 32970 50 Extra high alumina brick and shapes containing 87 1/2% alumina and higher, and extra high alumina pouring pit refractories, including sleeves, nozzles, runners, tuyeres, ladle gate parts, and mullite brick and shapes....... 29 39,708 36,000 9,315 136,668 32970 55 Zircon and zirconia brick and shapes made predominately of either of these materials, including electrocast........... 14 9,130 8,277 2,877 58,284 32970 58 All other brick and shapes, including dolomite, dolomite magnesite, forsterite, pyrophyllite-zircon, carbon and graphite crucibles, retorts, stopper heads, natural graphite refractories, and molten cast... 20 195,548 177,287 37,550 248,209 Mortars....................................... (X) 82,967 75,219 (X) 30,376 32970 61 Unshaped nonclay refractories basic bonding mortars made predominately of magnesite or chrome ore, dolomite, and other nonclay mortars, made predominately of forsterite, zircon, and silica................................. 11 (D) (D) (X) 22,357 32970 63 Extra high alumina refractory mortars made predominately of fused or synthetic alumina and mullite.............. 19 (D) (D) (X) 8,019 Plastic refractories and ramming mixes........ (X) 175,894 159,469 (X) 165,536 32970 65 Basic castable mixes, including chrome, chrome-magnesia, magnesia-chrome, magnesia, and dolomite..................... 13 53,493 48,498 (X) 35,574 32970 67 Extra high alumina plastic refractories and ramming mixes, 87 1/2% alumina and higher (made predominately of fused or synthetic aluminas and mullites), and extra high alumina phosphate bonded plastics and ramming mixes................. 21 69,137 62,681 (X) 80,950 32970 70 Extra high alumina castables and gunning mixes.............................. 10 11,660 10,571 (X) 15,417 32970 69 Other nonclay plastic refractories and ramming mixes.............................. 13 (D) (D) (X) 13,973 32970 68 Other nonclay refractory castables and plastics................................... 12 (D) (D) (X) 19,622 Gunning mixes 32970 72 Basic nonclay gunning mixes (including chrome, chrome-magnesia, magnesia- chrome, magnesia, and dolomite) and other nonclay gunning mixes................ 16 269,934 244,727 (X) 101,577 32970 75 Ceramic refractory fibers, 1500 degrees F and higher................................... 11 45,356 41,121 (X) 137,650 Other nonclay refractory materials in lump or ground form, including ground silica....................................... (X) 467,531 423,872 (X) 168,207 32970 94 Domestic shipments for direct use by customers as a finished refractory and all exported material 5/............... 20 240,651 218,179 (X) 101,286 32970 96 All other domestic shipments of nonclay refractory materials sold in lump or ground form as refractory raw material 4/................................ 9 226,879 205,693 (X) 66,921 32970 00 Nonclay refractories n.s.k. 6/................ (X) (X) (X) (X) 37,984 Dead-burned magnesia or magnesite............... (X) (D) (D) (X) (D) 32950 23 Domestic shipments for direct use as finished refractory products and all exported material 5/......................... 7 (D) (D) (X) (D) 32950 25 All other domestic shipments predominately for use as a refractory raw material................................. 8 (D) (D) (X) (D) 32740 71 Dead-burned dolomite............................ 2 (D) (D) (X) (D) D Withheld to avoid disclosing data for individual companies. n.s.k. Not specified by kind. X Not applicable. 1/Includes high alumina pouring pit refractories (containing 50% alumina and over), sleeves, nozzles, runners, and ladle gate parts. Excludes data for mullite and extra-high alumina refractories. These products are included in the nonclay refractories section. 2/Includes products referred to as plastic firebrick and the less plastic materials intended for ramming into place after the addition of water (when shipped in dry form). 3/Includes hydraulic setting castables designed for low thermal conductivity and having bulk densities as defined in ASTM classification C-401, not greater than 105 pounds/cubic foot. 4/Includes shipments to refractory producers for reprocessing in the manufacture of brick and other refractories. 5/Includes shipments for direct use as finished refractory products by establishments classified in manufacturing industries and excludes shipments to refractory producers for reprocessing in the manufacture of brick and other refractories. Includes all exports. 6/Not specified by kind (n.s.k.) represents the value of shipments for establishments which did not report detailed information and establishments, typically with less than five employees, which were not included on the MA32C mailing panel. Table 2b. Quantity and Value of Shipments of Refractories by Type: 1996 [Value in thousands of dollars] Quantity shipped (unit of measure) Product description M bricks No. (1,000 Value Product of Short Metric 9-inch of code cos. tons tons equivalent) shipments Clay and nonclay refractories..................... (X) (X) (X) (X) 2,340,757 3255- -- Clay refractories............................... (X) (X) (X) (X) 930,006 Brick and shapes.............................. (X) 895,335 811,727 284,409 532,865 32550 11 Fireclay, including semi-silica, bloating and superduty fireclay brick and shapes, fireclay and high alumina pouring pit refractories, clay kiln furniture, radiant heater elements, and other miscellaneous clay refractory shapes.......................... 31 419,880 380,671 130,469 r/177,709 32550 14 High alumina brick and shapes containing 50% alumina and over, including glass house pots, tank blocks, feeder parts, and upper structure shapes, made predominately of calcined bauxite, kyanite, andalusite, and similar raw materials 1/............................... 33 412,239 373,743 102,046 291,092 32550 35 Insulating brick and shapes................. 14 63,216 57,313 51,894 64,064 Unshaped clay refractories.................... (X) 728,855 660,794 (X) 337,621 32550 55 Refractory bonding mortars, wet and dry, including clay and high alumina....... 32 r/57,345 r/51,990 (X) r/27,863 32550 61 Plastic refractories and ramming mixes less than 50% alumina, high alumina plastic refractories and ramming mixes 50% alumina and over, and high alumina phosphate bonded plastic and ramming mixes 50% alumina and over 2/...... 27 158,654 143,839 (X) 76,816 32550 65 Castable refractories less than 50% alumina, high alumina castables 50% and over, and insulating castables (hydraulic setting) density up to 105 lbs./cubic foot 3/..................... 38 331,490 300,535 (X) 170,804 32550 70 Fireclay gunning mixes, including hydraulic setting gunning mixes, less than 505 alumina, high alumina gunning mixes, 50% alumina and over, and insulating gunning mixes (hydraulic setting)................................... 31 181,366 164,430 (X) 62,138 Other refractory raw materials and refractory materials sold in lump or ground form either for direct use by customer as a finished refractory product or as exported material.............. (X) 219,570 199,066 (X) r/27,566 32550 85 Clay and high alumina refractory raw materials 4/............................... 18 207,420 188,051 (X) r/24,409 32550 95 Clay and high alumina refractory materials 5/............................... 10 r/12,150 r/11,015 (X) r/3,157 32550 00 Clay refractories n.s.k. 6/................... (X) (X) (X) (X) 31,954 3297- -- Nonclay refractories............................ (X) (X) (X) (X) 1,410,751 Brick and shapes.............................. (X) r/547,919 r/496,753 r/124,430 r/807,612 32970 12 All silica bricks and shapes, excluding semi-silica................................ 17 r/67,999 r/61,649 r/30,655 r/70,589 32970 13 Magnesite-carbon brick and shapes, both less than 7% carbon, 7% carbon and over, predominately pitch and resin bonded, and carbon magnesite brick...................................... 8 r/111,563 r/101,145 r/20,849 r/117,007 32970 15 Magnesite brick and shapes, burned and unburned................................... 9 31,666 28,709 5,938 24,894 32970 19 Magnesite-chrome, chrome-magnesite, including high fires, burned and unburned brick, and chrome brick........... 6 r/64,192 r/58,198 r/11,602 67,931 32970 48 Silicon carbide brick and shapes made predominately of silicon carbide, including kiln furniture................... 13 r/22,592 r/20,482 r/5,147 r/91,082 32970 50 Extra high alumina brick and shapes containing 87 1/2% alumina and higher, and extra high alumina pouring pit refractories, including sleeves, nozzles, runners, tuyeres, ladle gate parts, and mullite brick and shapes....... 28 36,750 33,318 8,828 117,990 32970 55 Zircon and zirconia brick and shapes made predominately of either of these materials, including electrocast........... 15 r/7,810 r/7,081 2,564 59,141 32970 58 All other brick and shapes, including dolomite, dolomite magnesite, forsterite, pyrophyllite-zircon, carbon and graphite crucibles, retorts, stopper heads, natural graphite refractories, and molten cast... 20 205,347 186,171 38,847 258,978 Mortars....................................... (X) 80,746 73,206 (X) 37,698 32970 61 Unshaped nonclay refractories basic bonding mortars made predominately of magnesite or chrome ore, dolomite, and other nonclay mortars, made predominately of forsterite, zircon, and silica................................. 11 (D) (D) (X) 29,078 32970 63 Extra high alumina refractory mortars made predominately of fused or synthetic alumina and mullite.............. 21 (D) (D) (X) 8,620 Plastic refractories and ramming mixes........ (X) 179,710 162,929 (X) 150,470 32970 65 Basic castable mixes, including chrome, chrome-magnesia, magnesia-chrome, magnesia, and dolomite..................... 13 52,504 47,601 (X) r/33,425 32970 67 Extra high alumina plastic refractories and ramming mixes, 87 1/2% alumina and higher (made predominately of fused or synthetic aluminas and mullites), and extra high alumina phosphate bonded plastics and ramming mixes................. 23 73,453 66,594 (X) 72,880 32970 70 Extra high alumina castables and gunning mixes.............................. 10 9,603 8,706 (X) 12,553 32970 69 Other nonclay plastic refractories and ramming mixes.............................. 13 31,777 28,810 (X) 15,494 32970 68 Other nonclay refractory castables and plastics................................... 15 12,373 11,218 (X) 16,118 Gunning mixes 32970 72 Basic nonclay gunning mixes (including chrome, chrome-magnesia, magnesia- chrome, magnesia, and dolomite) and other nonclay gunning mixes................ 17 268,365 243,305 (X) 103,054 32970 75 Ceramic refractory fibers, 1500 degrees F and higher................................... 12 r/45,747 r/41,475 (X) 150,471 Other nonclay refractory materials in lump or ground form, including ground silica....................................... (X) r/398,310 r/361,115 (X) r/134,875 32970 94 Domestic shipments for direct use by customers as a finished refractory and all exported material 5/............... 18 (D) (D) (X) 78,646 32970 96 All other domestic shipments of nonclay refractory materials sold in lump or ground form as refractory raw material 4/................................ 9 (D) (D) (X) r/56,229 32970 00 Nonclay refractories n.s.k. 6/................ (X) (X) (x) (X) 26,571 Dead-burned magnesia or magnesite............... (X) (D) (D) (X) (D) 32950 23 Domestic shipments for direct use as finished refractory products and all exported material 5/......................... 7 (D) (D) (X) (D) 32950 25 All other domestic shipments predominately for use as a refractory raw material................................. 7 (D) (D) (X) (D) 32740 71 Dead-burned dolomite............................ 4 408,488 370,343 (X) 27,077 D Withheld to avoid disclosing data for individual companies. n.s.k. Not specified by kind. r/Revised by 5 percent or more from previously published data. X Not applicable. 1/Includes high alumina pouring piet refractories (containing 50% alumina and over), sleeves, nozzles, runners, and ladle gate parts. Excludes data for mullite and extra-high alumina refractories. These products are included in the nonclay refractories section. 2/Includes products referred to as plastic firebrick and the less plastic materials intended for ramming into place after the addition of water (when shipped in dry form). 3/Includes hydraulic setting castables designed for low thermal conductivity and having bulk densities as defined in ASTM classification C-401, not greater than 105 pounds/cubic foot. 4/Includes shipments to refractory producers for reprocessing in the manufacture of brick and other refractories. 5/Includes shipments for direct use as finished refractory products by establishments classified in manufacturing industries and excludes shipments to refractory producers for reprocessing in the manufacture of brick and other refractories. Includes all exports. 6/Not specified by kind (n.s.k.) represents the value of shipments for establishments which did not report detailed information and establishments, typically with less than five employees, which were not included on the MA32C mailing panel. Table 3a. Shipments, Exports, Imports, and Apparent Consumption of Refractories by Type: 1997 [Value in thousands of dollars] Percent Exports of exports to Manufacturers' domestic mer- manufacturers' shipments chandise 1/ 2/ shipments Product Value Product description Unit of Quan- Quan- at Quan- code 1/ measure tity Value tity port tity Value Clay and nonclay refractories 6/............ ......(X)....... (X) 2,140,230 (X) 369,093 (X) 17.0 Clay refractories......... ......(X)....... (X) 910,543 (X) 81,185 (X) 9.0 32550 11, Brick and 1,000 standard 14,35 shapes................. brick equivalent 273,113 555,492 (NA) 68,040 (NA) 12.0 32550 55 Unshaped clay 61,65,70 refractories and gunning mixes........... Metric tons...... 671,164 355,051 13,362 13,145 2.0 4.0 Nonclay refractories...... ......(X)........ (X) 1,229,687 (X) 287,908 (X) 23.0 32970 13, Nonclay magnesite 15,19 and magnesite-chrome brick and shapes 1,000 standard and chrome brick....... brick equivalent 36,968 199,832 (NA) 70,967 (NA) 36.0 32970 12, All other brick and 48,50,55, shapes................. 1,000 standard 58 brick equivalent 74,929 594,716 (NA) 100,890 (NA) 17.0 32970 61, Unshaped nonclay 63,65,67, refractories and 68,69,70, gunning mixes.......... Metric tons...... 520,536 435,139 160,190 116,051 31.0 27.0 72, 75 Percent Imports imports for consump- Apparent to apparent tion 1/ 3/ consumption 5/ consumption Unit of Quan- Quan- Quan- measure tity Value 4/ tity Value tity Value Clay and nonclay refractories 6/............. .......(X)....... (X) 273,824 (X) 2,044,961 (X) 13.4 Clay refractories.......... .......(X)....... (X) 27,422 (X) 856,780 (X) 3.2 32550 11, Brick and 14,35 shapes.................. 1,000 standard brick equivalent (NA) 26,266 (NA) 513,718 (NA) 5.1 32550 55 Unshaped clay 61,65,70 refractories and gunning mixes............ Metric tons...... 1,078 1,156 658,880 343,062 0.2 0.3 Nonclay refractories....... .......(X)....... (X) 246,402 (X) 1,188,181 (X) 20.7 32970 13, Nonclay magnesite 15,19 and magnesite-chrome brick and shapes and chrome brick............ 1,000 standard brick equivalent (NA) 95,329 (NA) 224,194 (NA) 42.5 32970 12, All other brick and 48,50,55, shapes.................. 1,000 standard 58 brick equivalent (NA) 125,795 (NA) 619,621 (NA) 20.3 32970 61, Unshaped nonclay 63,65,67, refractories and 68,69,70, gunning mixes........... Metric tons...... 40,981 25,278 401,327 344,366 10.2 7.3 72, 75 NA Not Available. X Not applicable. 1/For comparison of SIC-based codes with Schedule B export numbers and HTSUSA import numbers, see Table 4. 2/Source: Bureau of the Census report EM 545, U.S. Exports. 3/Source: Bureau of the Census report IM 146, U.S. Imports for Consumption and General Imports. 4/Value at port includes both import value and duty value. 5/Apparent consumption is derived by subtracting exports from the total of shipments plus imports (including duty). 6/The clay and nonclay refractories total shown here exclude product codes 32550 00, 32550 85, 32550 95, 32970 00, 3297 therefore, they differ from the totals shown in Tables 1 and 2a. Table 3b. Shipments, Exports, Imports, and Apparent Consumption of Refractories by Type: 1996 [Value in thousands of dollars] Percent Exports of exports to Manufacturers' domestic mer- manufacturers' shipments chandise 1/ 2/ shipments Product Value Product description Unit of Quan- Quan- at Quan- code 1/ measure tity Value tity port tity Value Clay and nonclay refractories 6/............ ......(X)....... (X) 2,119,791 (X) 381,057 (X) 18.0 Clay refractories......... ......(X)....... (X) 870,486 (X) 70,714 (X) 8.0 32550 11, Brick and 1,000 standard 14,35 shapes................. brick equivalent 284,409 532,865 (NA) 59,305 (NA) 11.0 32550 55 Unshaped clay 61,65,70 refractories and gunning mixes........... Metric tons...... 660,794 337,621 10,128 11,409 2.0 3.0 Nonclay refractories...... ......(X)........ (X) 1,249,305 (X) 310,343 (X) 25.0 32970 13, Nonclay magnesite 15,19 and magnesite-chrome brick and shapes 1,000 standard and chrome brick....... brick equivalent 38,389 209,832 (NA) 86,452 (NA) 41.0 32970 12, All other brick and 48,50,55, shapes................. 1,000 standard 58 brick equivalent 86,041 597,780 (NA) 119,172 (NA) 20.0 32970 61, Unshaped nonclay 63,65,67, refractories and 68,69,70, gunning mixes.......... Metric tons...... 520,915 441,693 149,362 104,719 29.0 24.0 72, 75 Percent Imports imports for consump- Apparent to apparent tion 1/ 3/ consumption 5/ consumption Unit of Quan- Quan- Quan- measure tity Value 4/ tity Value tity Value Clay and nonclay refractories 6/............. .......(X)....... (X) 234,859 (X) 1,973,593 (X) 11.9 Clay refractories.......... .......(X)....... (X) 26,649 (X) 826,421 (X) 3.2 32550 11, Brick and 14,35 shapes.................. 1,000 standard brick equivalent (NA) 25,442 (NA) 499,002 (NA) 5.1 32550 55 Unshaped clay 61,65,70 refractories and gunning mixes............ Metric tons...... 1,061 1,207 651,727 327,419 0.2 0.4 Nonclay refractories....... .......(X)....... (X) 208,210 (X) 1,147,172 (X) 18.1 32970 13, Nonclay magnesite 15,19 and magnesite-chrome brick and shapes and chrome brick............ 1,000 standard brick equivalent (NA) 86,806 (NA) 210,186 (NA) 41.3 32970 12, All other brick and 48,50,55, shapes.................. 1,000 standard 58 brick equivalent (NA) 94,693 (NA) 573,301 (NA) 16.5 32970 61, Unshaped nonclay 63,65,67, refractories and 68,69,70, gunning mixes........... Metric tons...... 38,237 26,711 409,790 363,685 9.3 7.3 72, 75 NA Not Available. X Not applicable. 1/For comparison of SIC-based codes with Schedule B export numbers and HTSUSA import numbers, see Table 4. 2/Source: Bureau of the Census report EM 545, U.S. Exports. 3/Source: Bureau of the Census report IM 146, U.S. Imports for Consumption and General Imports. 4/Value at port includes both import value and duty value. 5/Apparent consumption is derived by subtracting exports from the total of shipments plus imports (including duty). 6/The clay and nonclay refractories total shown here exclude product codes 32550 00, 32550 85, 32550 95, 32970 00, 3297 therefore, they differ from the totals shown in Tables 1 and 2a. Table 4. Comparison of Standard Industrial Classification-based Product Codes with Schedule B Export Numbers, and HTSUSA Import Numbers: 1997 Product Product description Export Import code number 1/ number 2/ 32550 11 Clay brick and shapes.................. 6902.20.1010 6902.20.1010 32550 14 6902.20.5010 6902.20.5010 32550 35 6902.90.1010 6902.90.1010 6902.90.5010 6902.90.5010 6903.90.0010 6903.90.0010 32550 55 Unshaped clay refractories and 32550 61 gunning mixes......................... 3816.00.0010 3816.00.0010 32550 65 32550 70 32970 13 Nonclay magnesite and magnesite- 32970 15 chrome brick and shames, and 32970 19 chrome brick.......................... 6902.10.1000 6902.10.1000 6902.10.5000 6902.10.5000 32970 12 All other nonclay brick and 32970 48 shapes................................ 6902.20.1020 6902.20.1020 32970 50 6902.20.5020 6902.20.5020 32970 55 6902.90.1020 6902.90.1020 32970 58 6902.90.5020 6902.90.5020 6903.90.0050 6903.90.0050 32970 61 Unshaped nonclay refractories and 32970 63 gunning mixes.......................... 3816.00.0050 3816.00.0050 32970 65 32970 67 32970 68 32970 69 32970 70 32970 72 32970 75 1/Source: 1997 edition, Harmonized System-Based Schedule B, Statistical Classification of Domestic and Foreign Commodities Exported from the United States. 2/Source: Harmonized Tariff Schedule of the United States, Annotated (1997).