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Refractoriness Comparison Chart

Refractoriness can be indicated using temperature cone numbers. In China, it’s denoted by adding one-tenth of the cone’s bending temperature to “WZ,” for example, WZ125 represents a bending temperature of 1250°C. In the United Kingdom and Japan, “SK” is used, while there are also American Standard Cones and Seger Standard Cone numbers, among others.

Refractoriness (°C)WZ NumberSK NumberSeger Cone (°C)American Standard Cone (°C)
1100110111001160
1120112211201165
1140114311401170
1160116411601190
1180118511801205
1200120612001230
1230123712301250
1250125812501260
1280128912801285
13001301013001305
13201301113201325
13501351213501335
13801381313801350
14101411414101400
14301431514351435
14601461614601465
14801481714801475
15001501815001490
15201521915201520
15301532015401530
15801582615801595
16101612716101605
16301632816301615
16501652916501640
1670673016701650
16901693116901680
17101713217101700
17301733317301745
17501753417501760
17701773517701785
17901793617901810
18201823718251820
18501853818501835
1880188391880
1920192401920
1960196411960
2000200422000
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