Not all the mgo board suit for external wall!

Views:619     Author:Rockmax     Publish Time: 2016-12-13 

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

Because fireproof,impact and flexibility performance of mgo board is better than fiber cement board and gypsum board, moisture,termite and mildew resistant is better than wood panel.

In recently,we found many negative informations regarding mgo board for external applications, it may involved panel deformation(bulging) or cracking at joint. Internet has misrepresented MGO BOARD’s perforamance, mislead end user use MGO replace of fiber cement board for cladding use, when builder install and treat it in the same way as fiber cement which cause problems.Actually fiber cement board and MGO Board are very different product.

Rockmax has been research and design magnesium oxide cement over 11 years,there are some experiences for share:

  • Most of mgo board are limit to use in low humidity environment, because original mgo board is air harden materials,it’s water safe, but not waterproof
  • Mgo board’s product category belongs to cement bonded wood particle board(CBPB), and all the CBPB’s wet expansion rate is larger than fiber cement,lower than wood panel in heat and wet recycle environment. Mgo board is next generation CBPB,lighter,higher strength and better fireproof.
  • Only few of reinforced mgo board has been tested and approval to use in wet application, but still need to check wet expansion before design.

In order to help buyer purchase and use MGO board correctly, here are information for share:

How many kinds of mgo board?

  • magnesium oxychloride hydrate(corrosive to steel components)
  • magnesium oxysulfate hydrate(less waterproof without modification)
  • magnesium oxyphosphate hydrate(release ammonia during production)

They are fomulated with different kind of salt, in different level of quality. Only few of companies has technical to produce modified high quality mgo board

for wet application.

How to certain a mgo board can use in wet application?

  • Need to check durability result under En 12467/ASTM C 1186, strength remain should > 0.75
  • Minimize wood particle volume, make sure of low water absorption and wet expansion rate close to fiber cement.

How to aviod risks of purchasing wrong MGO board?

  • Purchase from certified distributor or factory, which got BBA/ CE or UL/ETL/CCRR approval
  • Find a professional MGO board consutant company,control manufacturing process and final inspection.

ROCKMAX is one of the leading MGSO4 panel in China.

ROCKMAX passed climate resistant test in Stuttgart,Germany and SGS Shanghai in 2017. durablity test  to EN ISO 12467 -2012, Grade A class 3.

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

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


Original mgo board is air harden material, product category belong to cement bonded wood particle board(CBPB),customer need to take care of wet strength and wet expansion in heat and wet recycle environment. Don’t purchase uncertified mgo board with cheap price.

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