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Post by ronyon on Nov 9, 2014 0:02:57 GMT -8
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Post by Dan (Upstate NY, USA) on Nov 9, 2014 4:16:54 GMT -8
Magnesium oxide is the primary ingredient, not the only one. It won't hold up to high heat. Still uses paper or glass fiber to hold it all together...
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Post by ronyon on Nov 10, 2014 18:14:00 GMT -8
I wonder...there are plenty of videos showing these boards being blow torched, but all of them are by the companies that are making/selling the product.
I guess I will have to test it myself, since I want to know for sure.
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Post by pinhead on Nov 11, 2014 8:26:05 GMT -8
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Post by patamos on Nov 11, 2014 21:55:48 GMT -8
I've used it a few times as an alternative to drywall. There are a range of products out there varying in rigidity and surface sheen. They all tend to have fiberglass mesh on one or both surfaces. Tons of it coming out of china. The Building Biology Institute based in Germany advocates for its use as a wall board because it has excellent hygroscopic (breathability) characteristics. The building engineer i collaborate with tends to be very skeptical of manufacturer claims re fire retardant. And in this case he is spot on. I've subjected 2 varieties of 1/2" Mag O board to as little as 5 minutes of heat atop a 16" CSA heat riser and they have begun to disintegrate badly. There went my hopes of using it in anything close to high heat applications.
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Post by ronyon on Nov 11, 2014 22:29:14 GMT -8
Thanks Patamos.
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Post by patamos on Nov 13, 2014 9:44:29 GMT -8
Your welcome.
Hardi backer board or other cement boards might work better. Not that i am a fan of inhaling that dust.
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