Exterior Mgo Board2023-06-09T18:47:13+08:00
magnesium cement backer board

Magnesium Cement Sheathing Board

ROCKMAX magnesium cement sheathing board is pure inorganic building board that formulated with magnesium oxide cement and mineral aggregate. It is dimensional stable with super low water absorption, the durability has been tested to EN 12467(cement board standard). Highly recommend it for ETICS, decorative veneer backer board, exterior paint wall etc.

A1 FireproofWill not release toxic gas when it is burning
High StrengthBending strength 12mm > 16 Mpa
DurableTested to BS EN 12467 category A for exterior sheathing
Dimension stableDimension changes <0.2% in exterior wall
Low water absorptionWater absorption is lower than fiber cement board
Cut easilyScore and snap cut by utility knife
Material Safety meet EN REACH requirement, exclude 191 kind of harmful substance

Fire Resistance

Mold Resistance


Easy cut and work with

Impact Resistance

Heat Resistance


Building Safe

Moisture Resistance

Insect Resistance


Health Safe

Magnesium Cement Sheathing Board Technical Data Sheet

ParameterResultTest Standard
Density>1050kg/m3BS EN 12467 -2012
Bending strength12mm> 16 MpaBS EN 12467 -2012
Water absorbing by weight/24 hours< 10%BS EN 12467 -2012
Water impermeability  after 24h, water gauge 5 cmLack of leakageBS EN 12467 -2012
Shrinkage and expansion rate(outdoor)<0.2%ASTM C 1186-08
Thermal conductivity<0.22W/(m·K)ASTM C 518-10
Asbestos or formaldehydeNoneEN REACH
Fire ResistantA1EN ISO1182 &1176
Chloride content<0.1%ASTM C 871
Wet – dry          50 cycles
Heat rain          50 cycles
Freeze-Thaw      100 cycles
Strength remain>75%EN 12467
Category A  Class 3
Surface burning and smokeClass A  Flame Spread<25
Smoke Develop<25
ASTM E 84-12

Magnesium Cement Sheathing Board Applications:

ApplicationEIF & Stucco boardETICS backer board
Exterior backer board for brick veneerExterior backer board for curtain wall
Exterior backer board for aluminum composite panelExterior backer board for tile
Exterior fire resistant envelop system
Accessory(exterior wall)Steel frame or wood frameSelf drilling screw
Self adhesive mesh tapeFlexible jointing compound(Sika,Knauf grey)
Drained cavity batten,wall warpInsulation, mortar, mesh net, waterproof primer
LimitationCan not use as exterior claddingThickness no less than 9mm
Can not serve extreme high temperature >70’c

Magnesium Cement Sheathing Board Loading Capacity



Quantity 1 x Pallet

Loading capacity in 20ft CNT

Bulk Load In 20ft CNT

12mm x 1220 x 2440


67 pieces

550 pieces

 650 pieces

12mm x 1220 x 2750


67 pieces

540 pieces

 600 pieces

12mm x 1220 x 3050


65 pieces

520 pieces

 600 pieces

● Other thickness and dimension can be customized

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