Repirator masks????

[dick b]

I think that Hardiee cement tile backer board is a good substitute for the old Transite board that is no longer available. I'm going to spray paint the inside if mine with white epoxy appliance paint and it should work just fine.
Plus it doesn't cost a lot to buy and can be cut with a standard carbide circular saw blade. I'm gluing my fume hood together with polyurethane adhesive to keep from having metal parts that will corrode or rust. Then using clear polycarbonate for the windows.

 

[Harold_V]

My last two generations of hoods were made entirely of asbestos, but that day has passed. It would border on the impossible for anyone to procure the material today.

Harold

Hi,
there are still huge hills of free asbestos in Cassiar, BC Canada. Cassiar was the biggest asbestos manufacturer in N.America. It is a ghost town now. So, if U need it, just come and take as much, as U need.
Regards,
Hugo

Hugo,
It likely goes without saying that the asbestos I used was not raw. It had been commercially processed in various forms. One of them was Transite. It was very much a part of the hood I built, as well as the exhaust system. In this case, it formed the top of the fume hood, as well as the entire exhaust stack.

I also used an asbestos product that was bonded by some kind of plastic. I have no knowledge of its commercial name. I found it to be rather robust, resisting acids well, as well as heat, although it slowly degraded with repeated heating (red heat). I was given a large number of sheets, 1¼" thick, 18" wide x 8' long. I used them to make the sides of my fume hood, and the base on which it sat. The third type of asbestos used was Colorlith. All indications are that the material I used was made of asbestos, and it is still available, although no longer made of asbestos. It is routinely used in labs. This material was used for the front and back sides of the hood. I used what I could get at the time, when asbestos was quickly being phased out.

Piles of asbestos, eh? Sounds dangerous! :shock:

Harold

 

[capt_dugout]

am using a old surplus mil.gas mask with an old cpap machine to creat an on demand pressurized air supply for the mask. This eliminated the need to replace cartridges and changes in cartridges for diferent chemicals, it also helps reduce the fogging of the face shield from sweat due to the cooling effect of the forced air. I initialy used a air pump for filling air matresses but had trouble controling air flow pressure.

 

[Geo]

am using a old surplus mil.gas mask with an old cpap machine to creat an on demand pressurized air supply for the mask. This eliminated the need to replace cartridges and changes in cartridges for diferent chemicals, it also helps reduce the fogging of the face shield from sweat due to the cooling effect of the forced air. I initialy used a air pump for filling air matresses but had trouble controling air flow pressure.

i use a cpap at night and the hose is relatively short. if you adjust the settings to the maximum pressure how much hose can you play out before the pressure drops too much to be effective? most chemical fumes are heavier than air and stay close to the ground, i would assume the machine would need to be a good distance from the work area.