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Not all the mgo board suit for external wall!

Views:529     Author:Frank Lin     Publish Time: 2016-12-13      Origin:Site

Today mgo board plays an important role in fireproof building materials industry.


The reason is:

Mgo has better fireproof than fiber cement board and gypsum board at same thickness,meanwhile its heat transfer is less than half,bending strength and flexibility even better. Mgo is termite resistant and mildew proof,better than wood,and price is similiar.


In recently,we found more and more negative informations about mgo board for external wall

it may involved panel bending or cracking at joint,decoration material such as tile,marble fall off.

People is afraid and want to make sure of mgo board for exterior use?

Most of producers would say their mgo board can be use for both interior and exterior wall.

In fact,it is not that simple!


Exterior grade mgo board is a technical product.

It is base on scientific formula design,selected raw material and climate resistant treatment.

In China,only quite few of producers have ability to produce exterior grade mgo board.

Normal mgo without reinforcement can not use for exterior wall.


However magnesium oxide board,looks like the same. 

Most of producers do not have concept of technical requirement for exterior wall panel

Someone get business by using weak mesh fiber,less magnesium oxide,weak formula.

of course,this kind of panel would be aging fast when use in outsite.

When builder install this type of mgo board for exterior wall whitout any notice,became a disaster.



In order to rebuild market confidence,ROCKMAX suggest


1,Distributor need to have a deep understanding the technical level of your mgo factory

make sure of what level of mgo you are selling,and what kind of application is going to use.

because mgo board has different type and different quality level

Basiclly has 3 type,

-magnesium oxychloride hydrate

-magnesium oxysulfate hydrate

-magnesium oxyphosphate hydrate

The difference is they are fomulated with different kind of salt.

Different quality level mgo should put in appropriate place.


2,The designer,should understand exterior wall panel need strength remain above 0.75 and low water absorption rate,

There is no exception for mgo board.If they can't meet international standard,do not suggest to use as exterior render.


3,The builder need to check durability and chloride content report before installtion.

Some branded high density mgo board has full certificate,but they don't have chloride content report.

It may corrode steel,especially in wet environment,we suggest to use wood frame and stainless screw instead.

otherwise hold the bag and don't know why.


4,The end users should understand mgo board without full durability certificate,can't be use for exterior wall.

No matter how attractive for price and physical performance you got.


The mgo board with full certificate,recommend for such exterior applications:

a-The render system has insulation material laminated on outsite,great performance.

b-Underlayment for exterior decoration,such as tile,marble, aluminium composite panel,curtain wall,good performance..

c-In direct paint system,try to decrease moisture exchange as less as possible,good performance.
d-replace MDF or Gypsum board in exterior system,save a layer of water barrier,meanwhile increase waterproof and fireproof.

e-other exterior application,need to consult with mgo factory and paint factory.


ROCKMAX MAGNESIUM CEMETN BOARD  is one of the leading MGSO panel in China,it is chlorie free, climate resistant.

we have passed climate resistant test in Stuttgart,Germany and full durability test has been done in SGS Shanghai,

durablity test  to EN ISO 12467 -2012, Grade A class 3.

rockmax board before.png

rockmax board after.png


Conclusion is

After the completion of 50 heat-rain cycles the wall was inspected for damage. 

The complete wall surface exhibited no cracks, delamination, deformation or bending, see Figure 2, 

Enclosure 2. One of the boards exhibited slight lime efflorescence, as shown in Figure 2, Enclosure 2. 

Based on these results it can be concluded that the tested product meets the requirements of EN 12467, 5.5.3.

50 times is top degree for fiber cement board.

Find more durability test for Rockmax magnesium cement board,please contact our sales:marketing@rockmaxpan.com




About  RockMax™

Kunshan Boda Building Material Co.,Ltd.is a new company established in 2010, which is professional producer of magnesium cement boards, our...
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