Calcium aluminate refractory cement CA 75

Refractoriness ℃

1710-1750

     Chemical composition %

Al2O3

75

CaO max

25

SiO2 max

1.0

Fe2O3 max

0.7

Na2O+K2O max

0.4

S max

0.1

Specific density g/cm3

3.1-3.2

3.1-3.2

3.1-3.2

Specific surface area m2/kg min

600

600

600

Initial setting time minutes min

30

30

30

Final setting time minutes max

360

360

360

Rupture strength Mpa

6 hr

3.0

-

-

24 hr

5.0

5.0

5.0

72 hr

6.0

6.0

6.0

Cold crushing strength Mpa

6 hr

15

-

-

24 hr

35

30

35

72 hr

45

40

45

Castable performance

Corundum

castable

Low cement castable

Corundum

castable

Low cement castable

Corundum

castable

Low cement castable

Water addition %

5.2

6.8

5.2

6.8

5.2

6.8

Flow value mm

Initial flow value

196

178

192

168

220

164

30 minutes

186

175

190

164

203

152

60 minutes

174

168

177

165

193

156

Cold crushing strength Mpa

24 hr room temperature

18

21

21

22

20

20

110℃ dry 24hr

82

115

91

109

83

98

1100℃ heating 6 hr

52

123

49

120

50

116