The M4-Exterior Sheathing is Fiber reinforced,produced with composite materials of pure Magnesium Sulphate, expanded Perlite, other agents and strong alkali free glass fiber mesh. It is 100% Silica free. The board appears in its natural off white color as standard and has a hard and durable surface.
RESISTANT TO MOLD AND TERMITES
According ASTM D3273 resistance to growth of Mold, the M4-Exterior Sheathing achieved a rating of 10 on a scale of 0 – 10 where 10 is the best possible result. Thus concluding the PH value makes the M4 board very resistant to attack by Termites, and Mold.
M4 1/2″ Sheathing passed the ASTM E119 1-hour load bearing fire resistance rating on 2″x4″ wood studs at 100% design load, determined in accordance with the NDS.
CHLORIDE, MOISTURE ABSORPTION
The M4-Exterior Sheathing has limited moisture absorption from air humidity, compared to normal MgO boards, as the M4 board does not contain chloride, resulting in moisture absorption and more importantly NO corrosion of fasteners,
aluminium windows, etc.
Tested according to ASTM E72, M4 1/2″ is a racking shear wall. Governed by a 0.200″ drift limit its allowable load is 458 plf on wood studs and 243 plf on steel studs.
The board can absorb and release moisture an unlimited number of times, without changes in the board strength properties and the board has less than 0.15% moisture movement according ASTM D1037. The board is vapor permeable.
Exterior Sheathing, SIPs, Modular Construction. For commercial and residential construction, it is a single material replacement for walls requiring racking shear, fire rating and weather barrier. At only 1/2″ it affords more interior square footage space by eliminating material layers. M4 does not rot, warp, expand or contract, is eco-friendly,non-toxic and VOC free.