Product Description
High Density Heat and Arc Resistant Cement Board
Established in the year 1918, we have attained position as a renowned trader and exporter of premium quality High Density Boards. These boards are designed and manufactured by our vendors utilizing selected raw asbestos fibre and cement. Our vendors test the whole range of these boards on a series of quality parameters prior to dispatch it from their end. Offered High Density Boards are available in various shapes and dimensions as per the specific requirements of clients.
Features:
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Durable finish standards
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Compact design
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Light weight
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Stiffness
DISTINCTIVE PROPERTIES
High Density Boards are versatile materials which combine the following distinctive properties not available in any other individual material:
- Good thermal stability at high temperatures
- Low contact thermal shock thus eliminating fracture in items like glass components
- Low thermal conductivity
- High temperature resistance
- Good anti-tracking properties
- High arc resistance
- Ability to withstand high frequencies
- High strength even at high temperatures
- Extremely hardwearing leading to long product life cycle.
- Easy machineable without splitting or chipping
- Easy fixing by fasteners or adhesives
- Suitability as fire check barriers
- Good alkali resistance
- Non metallic thus controlling problem of induced currents
- Availability in high thickness blocks of up to 100 mm leading to convenient manufacturing of components
- Non-rusting
APPLICATIONS
The distinctive properties of
High Density Boards lead to their applications in numerous diverse areas. Some of these applications are:
- In Arc chutes and deflector plates on air-break circuit breakers, contactors and fuse gear
- As spacer strips and end packing blocks in distribution transformers
- For the control and extinction of electric arcs
- For handling and transferring hot glass components in the moulding areas, conveyor systems and annealing lehrs
- For manufacture of jigs, dies, moulds, guides, buffer strips, tubes, rods and other machined components
- As core plates in foundries and in furnaces
- For insulation of heated plattens in presses
- For insulation of coils, as top plate or support blocks in induction furnaces
- As guide strips or splash boards in handling of molten metals on hot castings
- For transportation of hot metal and pot line insulation in the aluminium industry
- As fire barriers or fire check doors
Mechanical Properties | Property |
| Unit | Nominal thickness(mm) 3.0-5.0 6.4-12.5 over 12.5 |
| Density | (Nominal) | gms/cc | 1.95 | 1.95 | 1.95 |
| Tensile Strength | ( min. ) | kgf/cm2 | 200 | 190 | 180 |
| Shear Strength | ( min. ) | kgf/cm2 | 400 | 380 | 350 |
| Flexural Strength | ( min. ) | kgf/cm2 | 450 | 410 | 350 |
| Ultimate Crushing Strength | ( min. ) | kgf/cm2 | 1500 | 1400 | 1250 |
| Compression Yield | ( max. ) | % | 5 | 4 | 3.5 |
| Water Absorption | ( max. ) | % | 15 | 14 | 13 |
Electrical Properties | Property | Unit | Nominal thickness(mm) 3.0-5.0 6.4-12.5 over 12.5 |
| Dielectric Strength in Air@90oC (min.) | kV/mm | 1.7 | 1 | 0.8 |
| Surface Breakdown in Air@ 90oC (min.) | kV | >10 | >10 | >10 |
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Thermal Properties
| Property | Unit | Nominal thickness(mm) 3.0-5.0 6.4-12.5 over 12.5 |
| Carbon Arc Test | Secs. | 120 | 120 | 120 |
| Spirit Burner Test | DOES NOT IGNITE |
| Thermal Conductivity | kcal/mh oC | 0.6 | 0.6 | 0.6 |
| Continuous Temp. Usage | oC | 350 | 350 | 350 |
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