I. Overview

Items

MgO BoardCalcium Silicate BoardGypsum Board

Fire Resistance

A1A1B

Water Resistance

ExcellentExcellentBad

Physical Properties

ExcellentExcellentNormal
Facing Material CompatibilityExcellentExcellent

Bad

Construction ConvenienceExcellentNormal

Normal

Environmental ProtectionNo toxic substancesAsbestos contained

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CostNormal costHigh cost

Low cost

II. Fire Resistance

MgO BoardCalcium Silicate BoardGypsum BoardDetails
Grade A1Grade A1Grade 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 BoardGypsum BoardDetails
Can be dried after soaking for 100 days, with little change in physical propertiesCan be dried after soaking for 30 days, with little change in physical propertiesDecompose 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 BoardCalcium Silicate BoardGypsum BoardDetails
Density0.9—1.3 g/cm21.3—1.5 g/cm21.2—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 Expansion2.6×10-7MM/C(MM/K)7.5×10-7MM/C(MM/K)

6×10-7MM/C(MM/K)

V. Facing Material Compatibility

MgO Board

Calcium Silicate BoardGypsum BoardDetails
Able to paste paper, cloth, PVC, veneer, aluminum board, tile and other decorative materialsAble to paste paper, PVC, veneer, aluminum board, tile and other decorative materialsCannot 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 BoardGypsum BoardDetails
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 BoardGypsum BoardDetails
No toxic substancesAsbestos-containingThere 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.