Fire-clay
1. N-1
AL2O3 (%)>42
Refractoriness >1750
Refractoriness under load KD>1400
Permanent linear change onreheating
1500*2h
1450*2h
1400*2h:+0.1; -0.4 
Apparent Porosity(%)<22
Cold crushing strength (Mpa)>29.4

2. N-2a
AL2O3 (%)>40
Refractoriness >1730
Refractoriness under load KD>1350
Permanent linear change onreheating
1500*2h
1450*2h
1400*2h:+0.1; -0.5 
Apparent Porosity(%)<24
Cold crushing strength (Mpa)>24.5

High-alumina brick
1. LZ-75
AL2O3 (%)>75
Refractoriness>1790
Refractoriness under load KD>1520
Permanent linear change onreheating
1500*2h:+0.1; -0.4 
1450*2h
1400*2h
Apparent Porosity(%)<23
Cold crushing strength (Mpa)>53.9

2. LZ-65
AL2O3 (%)>65
Refractoriness >1790
Refractoriness under load KD>1500
Permanent linear change onreheating
1500*2h:+0.1; -0.4 
1450*2h
1400*2h
Apparent Porosity(%)<23
Cold crushing strength (Mpa)>49

3.LZ-55
AL2O3 (%)>55
Refractoriness >1770
Refractoriness under load KD>1470
Permanent linear change onreheating
1500*2h:+0.1; -0.4
1450*2h
1400*2h 
Apparent Porosity(%)<22
Cold crushing strength (Mpa)>44.1

4.LZ-48
AL2O3 (%)>48
Refractoriness >1750
Refractoriness under load KD>1420
Permanent linear change onreheating
1500*2h
1450*2h:+0.1; -0.4
1400*2h 
Apparent Porosity(%)<22
Cold crushing strength (Mpa)>39.2

5. LZ-80
AL2O3 (%)>80
Refractoriness >1790
Refractoriness under load KD>1530
Permanent linear change onreheating
1500*2h:+0.1; -0.4 
1450*2h
1400*2h
Apparent Porosity(%)<23
Cold crushing strength (Mpa)>55

6.LZ-85
AL2O3 (%)>85
Refractoriness >1790
Refractoriness under load KD>1550
Permanent linear change onreheating
1500*2h:+0.1; -0.4 
1450*2h
1400*2h
Apparent Porosity(%)<23
Cold crushing strength (Mpa)>55