PVA glue will this prevent water from entering the MDF by high humidity or a small amount of water being splashed onto it(evaporating soon after)
MDF primer will this prevent water from entering the MDF by high humidity or a small amount of water being splashed onto it(evaporating soon after)
will the above prevent poisonous gases escaping from the wood?
Full Version: Mdf And Water Resistance
there aint any dangerous gases inside MDF, its when you chop it up the dust particals, I wouldnt worry unless you work with it everyday of the week.
QUOTE
A 1999 Health and Safety Executive (HSE) study found no difference in respiratory function and pathology between groups of workers machining MDF and those working with other types of wood. The HSE concluded: "Based on the available data for workers receiving exposures arising from machining MDF, although limited in its extent and scope, there is no evidence that these exposures produce health effects that are different in nature to the effects seen in workers receiving similar exposures arising from machining particle board and hardwood."
The HSE recommends that people should not be exposed to more than 5mg per cubic metre of dust from either MDF, softwood or hardwood - something you should bear in mind next time you sand the floor. "Most people at home doing floor sanding are going to be exposed to concentrations way, way in excess of that," Hay says. What's more, there is some evidence that a huge, one-off exposure could be enough to trigger illness.
"Above a certain level, peak exposure is more important than chronic exposure," he adds. "Peak exposure causes a huge insult to the lungs, which the body cannot deal with, triggering the response that ends up as asthma. So high dust exposures are not advisable."
Still, Woolley insists, the risk must be seen in context. "There is the possibility that if you were exposed to a dust that could be shown to cause cancer, then you might get cancer later on. But if you go into smoky pubs regularly, what's the origin of your cancer? It's going to be very, very difficult to attribute that to MDF exposure," he says.
The HSE recommends that people should not be exposed to more than 5mg per cubic metre of dust from either MDF, softwood or hardwood - something you should bear in mind next time you sand the floor. "Most people at home doing floor sanding are going to be exposed to concentrations way, way in excess of that," Hay says. What's more, there is some evidence that a huge, one-off exposure could be enough to trigger illness.
"Above a certain level, peak exposure is more important than chronic exposure," he adds. "Peak exposure causes a huge insult to the lungs, which the body cannot deal with, triggering the response that ends up as asthma. So high dust exposures are not advisable."
Still, Woolley insists, the risk must be seen in context. "There is the possibility that if you were exposed to a dust that could be shown to cause cancer, then you might get cancer later on. But if you go into smoky pubs regularly, what's the origin of your cancer? It's going to be very, very difficult to attribute that to MDF exposure," he says.
QUOTE(established1976 @ Dec 10 2007, 05:55 PM) 
there aint any dangerous gases inside MDF, its when you chop it up the dust particals, I wouldnt worry unless you work with it everyday of the week.
QUOTE
A 1999 Health and Safety Executive (HSE) study found no difference in respiratory function and pathology between groups of workers machining MDF and those working with other types of wood. The HSE concluded: "Based on the available data for workers receiving exposures arising from machining MDF, although limited in its extent and scope, there is no evidence that these exposures produce health effects that are different in nature to the effects seen in workers receiving similar exposures arising from machining particle board and hardwood."
The HSE recommends that people should not be exposed to more than 5mg per cubic metre of dust from either MDF, softwood or hardwood - something you should bear in mind next time you sand the floor. "Most people at home doing floor sanding are going to be exposed to concentrations way, way in excess of that," Hay says. What's more, there is some evidence that a huge, one-off exposure could be enough to trigger illness.
"Above a certain level, peak exposure is more important than chronic exposure," he adds. "Peak exposure causes a huge insult to the lungs, which the body cannot deal with, triggering the response that ends up as asthma. So high dust exposures are not advisable."
Still, Woolley insists, the risk must be seen in context. "There is the possibility that if you were exposed to a dust that could be shown to cause cancer, then you might get cancer later on. But if you go into smoky pubs regularly, what's the origin of your cancer? It's going to be very, very difficult to attribute that to MDF exposure," he says.
The HSE recommends that people should not be exposed to more than 5mg per cubic metre of dust from either MDF, softwood or hardwood - something you should bear in mind next time you sand the floor. "Most people at home doing floor sanding are going to be exposed to concentrations way, way in excess of that," Hay says. What's more, there is some evidence that a huge, one-off exposure could be enough to trigger illness.
"Above a certain level, peak exposure is more important than chronic exposure," he adds. "Peak exposure causes a huge insult to the lungs, which the body cannot deal with, triggering the response that ends up as asthma. So high dust exposures are not advisable."
Still, Woolley insists, the risk must be seen in context. "There is the possibility that if you were exposed to a dust that could be shown to cause cancer, then you might get cancer later on. But if you go into smoky pubs regularly, what's the origin of your cancer? It's going to be very, very difficult to attribute that to MDF exposure," he says.
phew a weight of my mind
anyone know about the water proofness of MDF primer and PVA glue? would these be sufficent in preventing water being absorbed (if droplets splashed onto the surface?)
I've been priming and painting all of the mdf bits in my cupboard recently. Using international mdf primer and a satin paint overcoat. I did this because I was worried about any absorbtion of water and warping of the mdf. But like you am guessing it helps, but am unsure.
I would guess that my 2 layers of primer and one layer of overcoat would prevent any splashes. However please don't quote me on that.
I would guess that my 2 layers of primer and one layer of overcoat would prevent any splashes. However please don't quote me on that.
Gloss paint is your friend. Its liquid plastic so once you've put on one coat, the MDF will be sealed.
pva glue is water based mate, if moisture it present constanly then pva would just simply disolve!!
gloss paint definelty as its acrilic based (or oil, too stoned carnt remember
)
gloss paint definelty as its acrilic based (or oil, too stoned carnt remember
)
QUOTE(twatrec @ Dec 10 2007, 07:09 PM)
pva glue is water based mate, if moisture it present constanly then pva would just simply disolve!!
gloss paint definelty as its acrilic based (or oil, too stoned carnt remember )
gloss paint definelty as its acrilic based (or oil, too stoned carnt remember
)Painted my old room with gloss paint. Small room + no ventilation (before the fan was installed) + gloss paint = giggling like twats for hours, with a horrendous hangover the next day! So, to summarise gloss paint is solvent based. I think its oil based.
MDF unless you buy medite formaldehyde free which costs double standard MDF, MDF will release formaldehyde gas for at least 20 years, cannabis reacts badly to this gas, so do humans. Even painting all surfaces only slows the release.
QUOTE(Uglykittens @ Dec 11 2007, 07:19 AM)
QUOTE(twatrec @ Dec 10 2007, 07:09 PM)
pva glue is water based mate, if moisture it present constanly then pva would just simply disolve!!
gloss paint definelty as its acrilic based (or oil, too stoned carnt remember )
gloss paint definelty as its acrilic based (or oil, too stoned carnt remember
)Painted my old room with gloss paint. Small room + no ventilation (before the fan was installed) + gloss paint = giggling like twats for hours, with a horrendous hangover the next day! So, to summarise gloss paint is solvent based. I think its oil based.which is a good thing
I really hope the same cant be said of chipboard 
QUOTE(oldtimer1 @ Dec 10 2007, 07:33 PM)
MDF unless you buy medite formaldehyde free which costs double standard MDF, MDF will release formaldehyde gas for at least 20 years, cannabis reacts badly to this gas, so do humans. Even painting all surfaces only slows the release.
I didnt know that, I guess its because its safe levels?
I mean do the levels of this gas released really cause any danger to humans and any noticable difference when growing plants inside a cabinet made from mdf (bear in mind the air is changed every few minutes anyway)
e2a : a quick google found this
I mean do the levels of this gas released really cause any danger to humans and any noticable difference when growing plants inside a cabinet made from mdf (bear in mind the air is changed every few minutes anyway)
e2a : a quick google found this
QUOTE
10. Formaldehyde emissions from finished wood-based panels
Thirty years ago, particleboard emitted 10 times more formaldehyde than today's E-1 board produced with modern UF resins. Since formaldehyde emissions from board increases with temperature and humidity, it is suggested that half of E-1 is a standard that provides a safe level to avoid allergic reactions. This level is not much greater than formaldehyde emissions from green wood and can be obtained by using new types of binders or by spraying the board with a substance to absorb the formaldehyde.
11. VOC emissions from finished board
Several studies show that VOCs in indoor air can cause irritation and allergic reactions. Other studies show that there is no direct correlation and that emissions from MDF are no higher than from kiln-dried lumber. In Europe, a method of analyzing indoor VOC has been proposed as a first step in continued studies of the health effects of VOC emissions
Thirty years ago, particleboard emitted 10 times more formaldehyde than today's E-1 board produced with modern UF resins. Since formaldehyde emissions from board increases with temperature and humidity, it is suggested that half of E-1 is a standard that provides a safe level to avoid allergic reactions. This level is not much greater than formaldehyde emissions from green wood and can be obtained by using new types of binders or by spraying the board with a substance to absorb the formaldehyde.
11. VOC emissions from finished board
Several studies show that VOCs in indoor air can cause irritation and allergic reactions. Other studies show that there is no direct correlation and that emissions from MDF are no higher than from kiln-dried lumber. In Europe, a method of analyzing indoor VOC has been proposed as a first step in continued studies of the health effects of VOC emissions
UK MDF holds the the most, about 9 or 10% by weight, its increased use for making things including modern kitchens and furniture as well as in modern house builds combined with central heating is thought to be one of the main reasons for increased child asthma and allergies of people of all ages and the good old sick building syndrome, it is also thought to be a carcinogen.
Seeing its a billion pound industry in the uk, vested interest means the uk government is resisting any changes vis the eu on VOC’s, aint that just typical, even the usa are doing something about it because the problem is so bad.
As far as the dust created when machining, a high portion of the dust is in the 2 and 3 micron range, unlike most real wood, ordinary dust masks give little or no protection, it goes straight through them.
Seeing its a billion pound industry in the uk, vested interest means the uk government is resisting any changes vis the eu on VOC’s, aint that just typical, even the usa are doing something about it because the problem is so bad.
As far as the dust created when machining, a high portion of the dust is in the 2 and 3 micron range, unlike most real wood, ordinary dust masks give little or no protection, it goes straight through them.
i wonder what percentage in houses are made from mdf.
painting will slow the release, i guess i'll have to give numerous coats
painting will slow the release, i guess i'll have to give numerous coats
QUOTE(a_lover_not_a_grower @ Dec 10 2007, 02:16 AM)
PVA glue will this prevent water from entering the MDF by high humidity or a small amount of water being splashed onto it (evaporating soon after)
Yes, I have effectively sealed MDF with several coats of thinned PVA.
well being carpenter i work with MDF alot there 3 type on MDF ,the standard which is just [browm] ,MR MDF which is Moistuer resistant[green] and FR MDF which is fire resistant[red] ,now with all 3 you need a face mask when cutting it and to be outside at the time ,this is when MDF dose all its damage,old MDF use to have sionide mix with the glue to speed up bonding,hence its be banned from most countries,also its pourous,tho not much .also PVA dont stick that well to edge and face of MDF ,tbh your better off use high grade ply wood
RB
RB
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