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#188943 - 09/11/09 01:50 PM UL Listed Plywood
maintenanceguy Offline
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Registered: 12/02/01
Posts: 303
Loc: Southern NJ, USA
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How can you tell if this plywood is UL listed?

(Click on thumbnail image)



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#188946 - 09/11/09 05:08 PM Re: UL Listed Plywood [Re: maintenanceguy]
HotLine1 Offline

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Registered: 04/03/02
Posts: 6804
Loc: Brick, NJ USA
Perhaps a flame spread test?
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#188947 - 09/11/09 05:16 PM Re: UL Listed Plywood [Re: HotLine1]
renosteinke Offline
Cat Servant
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Registered: 01/22/05
Posts: 5305
Loc: Blue Collar Country
A very ... interesting .... way to remodel a bath! Perhaps the last panel rusted apart?

Irreverent comment follows: There actually IS such a thing as "UL Listed plywood!" UL does list some plywood for surface fire resistance, as evaluated by a flame-spread test (E-84).

Still ... the UL standard for panels states plainly at its' beginning (materials) that wood shall not be used in the construction.

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#188969 - 09/13/09 06:14 PM Re: UL Listed Plywood [Re: renosteinke]
HotLine1 Offline

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Registered: 04/03/02
Posts: 6804
Loc: Brick, NJ USA
Reno:
What you are refering to is 'FRP" rated/labeled plywood. That's the designation 'grade stamp on each sheet, I do not know if 'FRP' is the UL nomenclature.
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#188973 - 09/13/09 08:11 PM Re: UL Listed Plywood [Re: HotLine1]
gfretwell Offline

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Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
The only FRP I know about is "Fiberglass Reinforced Panel". The stuff I saw was more of a plastic thing than plywood.
They use it in commercial kitchens and public bathrooms in tough spots. It handles hosing down well. I am not sure about flame.
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#188975 - 09/13/09 08:22 PM Re: UL Listed Plywood [Re: gfretwell]
electure Offline

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Registered: 12/24/00
Posts: 4226
Loc: Fullerton, CA USA

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#188976 - 09/13/09 09:16 PM Re: UL Listed Plywood [Re: electure]
JoeKP Offline
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Registered: 03/29/08
Posts: 144
Loc: Berkley, MA
that second link looks like what they make those industrial freezers out of
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#188977 - 09/13/09 11:04 PM Re: UL Listed Plywood [Re: JoeKP]
renosteinke Offline
Cat Servant
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Registered: 01/22/05
Posts: 5305
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No, Hotline, I am NOT referring to FRP, or the partitions they have inside gear.

I am describing actual, ordinary plywood that has been pressure-treated for fire resistance. It does exist - good luck finding it, though!

The UL label oneach sheet will contain numbers representing ratings for flame spread and smoke developed. You can find similar labels on rolls of household insulation.

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#188983 - 09/14/09 08:43 AM Re: UL Listed Plywood [Re: renosteinke]
electure Offline

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Registered: 12/24/00
Posts: 4226
Loc: Fullerton, CA USA

Reno,

The first link I posted above leads to all the information on type FRS fire resistant plywood, including a picture of the labeling.

It's commonly required for telco backboards in the 3/4" size, as well as specified for the mounting of electrical equipment & is readily available.

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#188984 - 09/14/09 10:21 AM Re: UL Listed Plywood [Re: electure]
renosteinke Offline
Cat Servant
Member

Registered: 01/22/05
Posts: 5305
Loc: Blue Collar Country
Yes, it does, Scott! And, yes, telco backer boards is exactly where I have encountered the specification.

I had inferred that the other comments thought I was referring to the red-fiber stuff you find in switchgear. That "FRP" stuff commonly found in commercial kitchens is another material altogether.

Thanks for the good links!

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