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Old 04-11-2008, 12:18 PM   #1
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Techniques on coating plywood with flame retardant


I have to fire proof 500 sheets of 3/4" 4' X 8' plywood with a non-toxic flame retardant. It has the consistency of water. Does anybody know how the pros do it? It can be sprayed or dipped, but must be both sides must be covered so warping does not occur. Any advice? What type of system would you set up?

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Old 04-11-2008, 02:17 PM   #2
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Techniques on coating plywood with flame retardant


wouldn't it be easier to buy fire resisitant plywood? They make it in all kinds and species.

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Old 04-11-2008, 02:20 PM   #3
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Techniques on coating plywood with flame retardant


We are coating bamboo plywood and we are the distributor of this material. No one offers this service and we are trying to figure it out.
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Old 04-13-2008, 09:41 PM   #4
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Techniques on coating plywood with flame retardant


Here's your problem...

Fire treaters such as Hoover spend big money to get NFPA and UL approvals on their fire treating practices. They're definately not applying fire treatment with a pump sprayer, they're pressure treating to a certain retention of treatment per cubic foot of material.

Typically, fire treated lumber and plywood are made from non-refractory species such as southern pine. These species absorb enough treatment to gain approval as "fire treated." Refractory species such as oak, fir, and most other hardwoods must be incised in order to get the treatment to penetrate deep enough.

There is no way that you can apply typical fire treatment to a material as hard/refractory as bamboo.

If you somehow find a way or product to do it without compromising the pywood's nice looks, you still might have one more hurdle.
You can't sell it as "fire retardant" without the appropriate testing by a listing agency and the documentation to prove it. The product must also carry a stamp identifying it as fire treated, and that will show flame and smoke spread characteristics. If you're selling it for a project that will involve inspections, you'd better have your ducks in a row, because you're in for a battle and a heck of a lot of liability.
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Old 04-15-2008, 02:20 PM   #5
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Techniques on coating plywood with flame retardant


Thanks for the advice! We are finally putting together the puzzle.
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