Respirator suggestions for rattle-can 2k paint?

[Jelly_Sheffield]

Type A2 protects against organic gases and vapors, eg solvents, whose boiling point exceeds +65 ° C.

An A2 filter won't give adequate protection against most of the solvents used in paints and adhesives, but does have a higher capacity than type A1 (protects against 5000ppm Vs 1000ppm contamination levels)

A1 & A2 are suitable for 2K paints unless thinned with a low-boiling solvent (bearing in mind the HSE guidance that spraying 2K indoors requires air-fed), and less volatile solvent paints (usually those with traditional drying-oil paint chemistries and long open times).

For the vast majority of solvent based 1K paints (almost all modern quick drying film-deposition chemistries), a type AX filter would be required to get full protection, with the individual filter manufacturer specifying the number of hours it will protect against different solvents.

When using solvents etc they have time limits. But if you leave them for a few days they clear themselves.

Once spent they won't properly regenerate at room temperature and pressure, even if left for a long time.

If it appears to have a marked improvement when you leave them to air out, that's probably a sign that your getting fully saturated and experiencing breakthrough during use.

Whilst we call them "filters" they work on the principle of adsorption, meaning that the solvent (or other contamination) forms a weak chemical bond to the media in the filtered.

To break that bond and regenerate the media, either:

- Heat & Clear Airflow
- Heat & Vacuum
- High Pressure Dry Steam

Is required, which isn't something that a user can do to the filter cartridge.

Ultimately for proper protection during regular use, LEV and/or Air-Fed RPE is orders of materials cheaper, because filters are going to last at most a week of use, in many applications, possibly only one 8hr shift before there's a risk of breakthrough.

 

[Parm]

A PAPR hood, or a fit-tested full face, negative pressure filter mask, with A1BEK filter (which generally last 8 hrs of use or 30 days from opening the packet), is deemed suitable for outdoor spraying, indoor handling, and indoor brush/rollering.

This is not correct, i work at the pointy end of what you say is complicated, i very regularly see incorrect advice being given in all sorts of industries

 

[Jelly_Sheffield]

This is not correct,

It's there in the guidance on the HSE's website.

You can disagree with their assessment of the risk or appropriate controls... But factually that's part of their advice.

i work at the pointy end of what you say is complicated, i very regularly see incorrect advice being given in all sorts of industries

I don't disagree that poor advice on safely managing chemical exposure is extremely common, and that frequently leads to inappropriate or ill informed RPE selection.

But your implication that it's somehow not a complex field, doesn't give much credence to trying to invoke an argument from authority.

 

[Parm]

It's there in the guidance on the HSE's website.

You can disagree with their assessment of the risk or appropriate controls... But factually that's part of their advice.


I don't disagree that poor advice on safely managing chemical exposure is extremely common, and that frequently leads to inappropriate or ill informed RPE selection.

But your implication that it's somehow not a complex field, doesn't give much credence to trying to invoke an argument from authority.

I didn’t say it wasn’t complex

Anyway I’m not on here to argue with anyone,, carry on as you wish

 

[Dcal]

Anyway I’m not on here to argue with anyone,,

Or add anything useful.

 

[KemppiFrog]

Humm. I needed to spray my van and the available paint was 2part icocyanate. Having used marine 2K paint a while before, I was well aware of the problems. So, I rigged up a blower from my dentist friend (ex vacuum pump). Air from outside the workshop to a mask that I made really sure sealed on my (well shaved) face, plus good sealed goggles. Flow rate was multiples of what I needed to breath, so the exhaust was constant.
Worked fine. BUT, I AM NOT RECOMMENDING THIS TO PEOPLE WHO MIGHT NOT GET IT RIGHT.
Sprayed the van one evening, then just shut the door and went home.
It was 24 yrs ago, but I would do it again and might have to, as the Twingo needs the front wings and bonnet repainted. Paint looks 2K. But maybe not Icocyanate.
KF

 

[Jelly_Sheffield]

Humm. I needed to spray my van and the available paint was 2part icocyanate. Having used marine 2K paint a while before, I was well aware of the problems. So, I rigged up a blower from my dentist friend (ex vacuum pump). Air from outside the workshop to a mask that I made really sure sealed on my (well shaved) face, plus good sealed goggles. Flow rate was multiples of what I needed to breath, so the exhaust was constant.
Worked fine. BUT, I AM NOT RECOMMENDING THIS TO PEOPLE WHO MIGHT NOT GET IT RIGHT.
Sprayed the van one evening, then just shut the door and went home.
It was 24 yrs ago, but I would do it again and might have to, as the Twingo needs the front wings and bonnet repainted. Paint looks 2K. But maybe not Icocyanate.
KF

That's some Sub-Saharan Africa levels of ingenuity right there.

As discussed elsewhere, there are commercially available supplied air systems working on that principle.

 

[KemppiFrog]

That's some Sub-Saharan Africa levels of ingenuity right there.

As discussed elsewhere, there are commercially available supplied air systems working on that principle.

True, but my solution cost nothing more than what I had handy. Not to mention that where I was then, systems were not so available.
Friend was visiting Zambia... Noticed them welding with sunglasses as eye protection.......

 

[rcx132]

For those who are using passive filters with Isocyanate, be aware that the filters don't last long with this chemical.

 

[Jelly_Sheffield]

True, but my solution cost nothing more than what I had handy. Not to mention that where I was then, systems were not so available.

That was very much meant as a compliment, what I respect about it is the directness and ingenuity:

- Need thing,
- Have some items,
- Make a more or less working facsimile of thing from what you have,
- ???
- Profit!

Friend was visiting Zambia... Noticed them welding with sunglasses as eye protection.......

Less ideal, but still better than the foundries and forges in India and Pakistan where everyone wears sandals and salwar kameez whilst swinging yellow-hot steel about.