NR-80 and NR-85 dense calcium silicate board is aluminum non-wetting with carbon fiber or glass fiber reinforced specially designed for molten aluminum casting and industrial furnaces structural insulation applications. It has excellent thermal shock resistance at high temperature up to 1000°C with a bulk density ranging from 810 to 1250 kg/m3. The materials are composed primarily of high purity calcium silicate and selected glass fibers or carbon fibers which enhance much its compressive and flexural strength, after heating processing the boards have a minimum low shrinkage which will avoid any cracking developing as a result of the thermal shrinkage. The boards are aluminum non-wetted and exhibit excellent machinable uniformity which makes it an ideal candidate material for many molten metals contact processing works, such as the transporting, distributions and flow control, casting of aluminum metals and the alloys. Because of its dimensional stability and machinable properties the boards can be made into different kinds of components used aluminum casting with excellent performance of high resistance to breakage during the casting processing, such as transition plates (T-plates), hot top rings, floats, spouts, caster tips, skim dams, trough, bushes etc.
| Items | Unit | NR‐60 | NR‐80 | NR‐85 | NR-85STEEL | NR-95 | NR‐110 |
| Density | Kg/m³ | 550 | 810 | 860 | 1000 | 950 | 1100 |
| Modulus of rupture | MPa | ≧3 | ≧8 | ≧7 | ≧12 | ≧7 | ≧14 |
| C.C.S | MPa | ≧6 | ≧16 | ≧14 | ≧19 | ≧17 | ≧20 |
| Thermal Conductivity Mean Temp. | W/m°K | ||||||
| 200°C | 0.09 | 0.09 | 0.14 | 0.14 | 0.13 | 0.15 | |
| 400℃ | 0.10 | 0.11 | 0.12 | 0.16 | 0.15 | 0.17 | |
| 800℃ | 0.12 | 0.15 | 0.16 | 0.25 | 0.22 | 0.25 | |
| Loss on ignition | % | <8 | <8 | <8 | <8 | <8 | <8 |
| Thermal shrinkage 12hr | 1000℃ | 1000℃ | 1000℃ | 1000℃ | 1000℃ | 1000℃ | |
| @ Length or Width | % | 0.2 | 0.20 | 0.2 | 0.4 | 0.4 | 0.40 |
| @ Thickness | % | 1.4 | 1.40 | 1.3 | 1.5 | 1.0 | 1.0 |
| Screw Holding Strength @ 22mm penetration | kg | 80 | 105 | 110 | 120 | 120 | 145 |
| Coefficient of Thermal Expansion | /℃ | 6.5*10-6 | 6.4*10-6 | 6.4*10-6 | 6.4*10-6 | 6.3*10-6 | 6.1*10-6 |
| Standard Sizes | 1200 X 600 mm , 1200 X 1200 mm , 2400 x 1200mm, 2520 x 1200mm | ||||||
| Available Thickness | 13, 19, 25, 27, 32, 38.1 44, 51.4, 63, 76.1, 101.6 | ||||||
| Advantages | Low thermal conductivity, Non‐wetting, Excellent mechanical strength, Asbestos free, easy to install, dimensional stability | ||||||
| Applications | • Dip tubes • Pouring spouts • Hot‐top rings • Stopper pins • End dams • Floats • Launders, Holding furnace insulation linings, ladle insulation boards. | ||||||
Note: The physical and chemical properties listed represent typical, average values obtained in accordance
with accepted test methods and are subject to normal manufacturing variations. They are supplied as a technical service and are subject to change without notice
High resistance to thermal shock
Non-asbestos
Non-wetted with molten aluminum
Dimensional stability
Extremely low thermal shrinkage.
High compressive and flexural strength
Excellent machinability
Non-reactive against graphite or boron nitride
Easy to install and easy to remove solidified metal
Annealed processed before delivery
Aluminum non wetting dense calcium silicate boards are ideal choice for molten metal contact thermal processing equipment or industrial structural insulation components,
*Billet and ingot casting; *Continuous casting; *Low pressure die castings
Typical components: transition plates, caster tips, skim dams, trough, launders, floats, spouts, nozzles, bushes, hot top rings.
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