I. Overview
Items |
MgO Board | Calcium Silicate Board | Gypsum Board |
Fire Resistance |
A1 | A1 | B |
Water Resistance |
Excellent | Excellent | Bad |
Physical Properties |
Excellent | Excellent | Normal |
Facing Material Compatibility | Excellent | Excellent |
Bad |
Construction Convenience | Excellent | Normal |
Normal |
Environmental Protection | No toxic substances | Asbestos contained |
/ |
Cost | Normal cost | High cost |
Low cost |
II. Fire Resistance
MgO Board | Calcium Silicate Board | Gypsum Board | Details |
Grade A1 | Grade A1 | Grade B |
The MgO board and the calcium silicate board are both incombustible materials, while the gypsum board begins to carbonize at 200°C. |
III. Water Resistance
MgO Board |
Calcium Silicate Board | Gypsum Board | Details |
Can be dried after soaking for 100 days, with little change in physical properties | Can be dried after soaking for 30 days, with little change in physical properties | Decompose with water and the strength decreases |
The waterproof performance of MgO board and the calcium silicate board is basically the same. The gypsum and the kraft paper are not waterproof. |
IV. Physical Properties
|
MgO Board | Calcium Silicate Board | Gypsum Board | Details |
Density | 0.9—1.3 g/cm2 | 1.3—1.5 g/cm2 | 1.2—1.3 g/cm2 |
The glass fiber in MgO board is cloth-like, which has low density and high strength, so it is light and strong. Calcium silicate board has short fibers, which means it is strong only with high density. |
Impact Strength |
≥4.5KJ | ≥3.5KJ |
≤1KJ |
The glass fiber in MgO board is cloth-like, which has more advantages in bending and impact resistance. The alkalic calcium silicate board will corrode the glass fiber and we can only use asbestos and pulp short fibers. |
Bending Strength |
≥20MPa | ≥14MPa |
≤9MPa |
|
Thermal Conductivity |
0.64W/m2(W/m2·k) | 0.53W/m2(W/m2·k) |
0.61W/m2(W/m2·k) |
All three kinds of boards are inorganic, and there is no significant difference in terms of thermal conductivity and thermal expansion. |
Thermal Expansion | 2.6×10-7MM/C(MM/K) | 7.5×10-7MM/C(MM/K) |
6×10-7MM/C(MM/K) |
V. Facing Material Compatibility
MgO Board |
Calcium Silicate Board | Gypsum Board | Details |
Able to paste paper, cloth, PVC, veneer, aluminum board, tile and other decorative materials | Able to paste paper, PVC, veneer, aluminum board, tile and other decorative materials | Cannot be painted, tiled and affixed directly |
Gypsum board has kraft paper, and it is not fireproof or waterproof. The high-grade MgO board has high strength and good flatness and is suitable for deep processing. |
VI. Construction Convenience
MgO Board |
Calcium Silicate Board | Gypsum Board | Details |
Pneumatic nails and screws can be used. Wallpaper cutter or saw blade can be used for cutting. | Pneumatic nails cannot be used. Only saw blade can be used for cutting. | Only screws can be used instead of pneumatic nails. Wallpaper cutter or saw blade can be used for cutting. |
Calcium silicate board has high density and brittleness, which make it easy to collapse and only tapping screws can be used. The MgO board is strong and wear-resistant. Gun nails, iron nail and screws can be used. |
VII. Environmental Protection
MgO Board |
Calcium Silicate Board | Gypsum Board | Details |
No toxic substances | Asbestos-containing | There is pulverization and no toxic substances |
Calcium silicate board fibers contain asbestos, waste paper fibers, and pulp fibers. Asbestos boards are not environmentally friendly and have low prices. Pulp fiber board is environmentally friendly and the price is pretty high. |
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