Al₂O₃(Mullite)

Mullite Roller material properties

#
HR 40
HR 60
HR 80
HR 100
알루미나 함유량
[Al₂O₃ %]
73~75 74~75 75~76 82
수분 흡수율
[Water absorption %]
10 9 8.5 5.5
밀도
[Density g/㎡]
2.35 2.5 2.55 2.8
파괴계수
[Modulus of rupture N/㎟]
45 50 55 65
탄성률
[Modulus of elasticity Gpa]
70 75 80 110
열팽창률
[Thermal expansion /℃]
5.5 5.8 5.9 5.5
열충격 저항성
[Thermal shock resistance]
Very Good Very Good Very Good Very Good
화학 저항성
[Chemical resistance]
Good Good Excellent Excellent
최고사용온도
[Max. appliance temperature]
1240℃ 1260℃ 1280℃ 1350℃

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Material characteristics - typical data

Properties
Units
Test
Pormulit®
Dimulit®
Rubalit®
Aluminum oxide Al₂O₃ 70% 60% >99.7%
Silicon oxide SiO2 28% 37% 0.05%
Ferric oxide Fe2O3 0.50% 0.60% 0.06%
Magnesium oxide MgO - 0.15% 0.15%
Calcium oxide CaO - 0.03% 0.03%
DIN VDE 0335 / IEC 672 - - C530 C610 C799
Color - - white white off white
Specific gravity kg/dm3 ASTM C 20 2.3 2.8 3.85
Water absorption % ASTM C 373 10 0 0
Hardness rockwell R45N ASTM E 18 - - 80
Flexural strength N/㎟ ASTM F 417 120 120 360
Max. Temp. use - 1500 1400 1700
Themal conductivity W/mK ASTM C 408 1.5 4 28
Thermal expansion / Linear coefficient
20 - 100℃ x10-6/℃ ASTM 372 3.6 4.5 5.4
20 - 300℃ - - 5.0 5.2 6.5
20 - 600℃ - - 5.6 5.8 6.7
20 - 1000℃ - - 6.4 6.7 8.5
Dielectric constant - ASTM D 150 - - 10
Dielectric strength kV/mm ASTM D 116 - - >10
Dielectric factor x10-3 ASTM D 150 - - 0.2
Volume resistivity
200℃ Ohm x cm ASTM D 257 - -
400℃ - - - -
600℃ - - - -