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Old 29th Jun 2019, 12:55 pm   #1
bobbyd123
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Default Bush DAC90 Asbestos Problem

I recently picked up this bush DAC90 The case is in good condition

I already have a Bush DAC10 Waiting for parts (Capacitors resistors)

I am not sure how or what to do with what may be asbestos around the dropper resistor (Photos attached)
I have not touched the radio so I don't no if the dropper is okay

I am hoping that you will be able to instruct me as to what is the best way forward to do this job Thank you!
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Old 29th Jun 2019, 1:26 pm   #2
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Default Re: Bush DAC 90 Asbestos Problem

If it is ok (the dropper) I might be tempted to hold a vac near it to suck up any loose fibres and then leave it.

To replace it I would wet it carefully first outside before touching.
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Old 29th Jun 2019, 1:33 pm   #3
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Default Re: Bush DAC 90 Asbestos Problem

Holding a vac near it would spread the asbestos fibres instead of containing them. It would be much better to do nothing if the only alternative is using a normal vac.

The vac should not only have industrial HEPA filtering, but also be constructed in a way that no fibres can escape or stay behind when emptying the bag.
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Old 29th Jun 2019, 2:28 pm   #4
crackle
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Default Re: Bush DAC 90 Asbestos Problem

Paint all the asbestos with diluted PVA glue, trying not to get any on the dropper.

Mike
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Old 29th Jun 2019, 2:34 pm   #5
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Default Re: Bush DAC 90 Asbestos Problem

Quote:
Originally Posted by HamishBoxer View Post
If it is ok (the dropper) I might be tempted to hold a vac near it to suck up any loose fibres and then leave it.

To replace it I would wet it carefully first outside before touching.
With all due respect, this is bad advice. They will pass straight through a standard cleaner and then be sprayed around the room.

Moving all the fibres around with a vacuum cleaner is the last thing you should be doing!

Disturb the asbestos as little as possible!
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Old 29th Jun 2019, 2:57 pm   #6
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Default Re: Bush DAC 90 Asbestos Problem

Soak it in fast setting step and sill repair cement.
Never disturb or remove asbestos unless you have the training, certification, insurance and equipment.

It's perfectly safe stabilised with cement as long as not subsequently cut, drilled, sawed, filed or disturbed.

Same applies to radium based glow in in the dark paint. Put FRESH luminous paint (it's the pigment that wears out) and then acrylic or polyurethane varnish. Never try to remove it.

In both cases it's the inhaled dust that is the hazard.
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Old 29th Jun 2019, 4:48 pm   #7
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Default Re: Bush DAC 90 Asbestos Problem

I had no Idea that they could be so dangerous
It's a shame because I am new to this hobby
Looks like there is no solution
I suppose I will have to bag it and send it off to the dump
Thanks anyway
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Old 29th Jun 2019, 5:08 pm   #8
HamishBoxer
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Default Re: Bush DAC 90 Asbestos Problem

No, don't dump it. As suggested PVA glue watered down across it, then leave alone.

I have one sat here and I certainly will not be disposing through asbestos.
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Old 29th Jun 2019, 5:19 pm   #9
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Default Re: Bush DAC 90 Asbestos Problem

No! Definitely don't dump it. Many things are dangerous if incorrectly handled, including electricity. If you follow the advice about sealing it and then don't poke about with it unnecessarily all will be fine.
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Old 29th Jun 2019, 5:30 pm   #10
M0FYA Andy
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Default Re: Bush DAC 90 Asbestos Problem

Don't get paranoid! Follow the advice to soak it in dilute PVA glue.

Andy
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Old 29th Jun 2019, 7:37 pm   #11
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Default Re: Bush DAC 90 Asbestos Problem

It 's bonded asbestos. There is not one iota of documented evidence that anyone has ever been harmed by the stuff. I speak as a retired health and safety professional.
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Old 29th Jun 2019, 7:51 pm   #12
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Default Re: Bush DAC 90 Asbestos Problem

Bits of it don't look very bonded to me

Lawrence.
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Old 29th Jun 2019, 8:22 pm   #13
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Default Re: Bush DAC 90 Asbestos Problem

I'd love to see a definition of 'bonded asbestos'. Would old Artex be classed as such? If so, there is plenty of evidence that when the stuff is drilled, scraped, prodded or, worst of all, sanded asbestos fibres can become airborne with obvious potential risk. Painted and left alone it should be fine however.

Back to the DAC 90 though, I certainly wouldn't give up on it either. It's really case of understanding the risk and acting accordingly.

Alan
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Old 29th Jun 2019, 8:48 pm   #14
HamishBoxer
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Default Re: Bush DAC 90 Asbestos Problem

Yes I had Artex tested at the last house prior to sale and no it was clear.
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Old 29th Jun 2019, 9:39 pm   #15
bobbyd123
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Default Re: Bush DAC 90 Asbestos Problem

Thanks to you all
So my first job
Pick up some PVA Glue and do as instructed to seal the asbestos
I can do this out side in my remote garage. The roof sheets are also asbestos
Warning Sign (Danger Do not climb Asbestos Roof! ) that's it

How long after treatment should I leave it before I can start my restoration I would guess around a couple of weeks
(Thanks again.)
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Old 29th Jun 2019, 9:55 pm   #16
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Default Re: Bush DAC 90 Asbestos Problem

I would be wary about using PVA glue because it's not heat resistant. If it flakes or peels you could have more trouble on your hands.

David
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Old 29th Jun 2019, 10:13 pm   #17
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Default Re: Bush DAC 90 Asbestos Problem

Hi

I've read in many places of using diluted PVA applied to asbestos to hold together the fibres which seems to be very effective. This applies particularly to out buildings which have asbestos roofs.
My only concern in its use in a valve radio is how well will it cope with the heat being close to the voltage dropper?
The suggestion of using repair cement by Mike. Watterson is a good idea which should cope with heat very well.

Regards,
Symon
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Old 29th Jun 2019, 10:54 pm   #18
Philips210
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Default Re: Bush DAC 90 Asbestos Problem

Quote:
Originally Posted by ajgriff View Post
I'd love to see a definition of 'bonded asbestos'. Would old Artex be classed as such? If so, there is plenty of evidence that when the stuff is drilled, scraped, prodded or, worst of all, sanded asbestos fibres can become airborne with obvious potential risk. Painted and left alone it should be fine however.
Hi.

Reading about asbestos in Artex a few years back came as quite a shock to me. Back in the early 1990s, I decided to install plaster coving to all the ceilings in our bungalow. When it was new in 1984, the bungalow had Artex ceilings with a smooth border close to the walls. To maintain the smooth border after fitting the new coving, I scraped off the Artex 1.5 inches in from the coving. I dread to think how much asbestos I've inhaled but I'm not going to lose any sleep over it. I wonder about how much exposure the builders had when mixing the stuff.
My late father told me when he was about 17, how he and his work mates used to knock through ceilings in bomb damaged properties during WW2. Apparently, many of these properties had asbestos in them. People were oblivious to the potential dangers.

Regards,
Symon
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Old 30th Jun 2019, 7:55 am   #19
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Default Re: Bush DAC 90 Asbestos Problem

I also have a DAC90 availing attention. When I get around to it I intend to take the same approach as coopzone, replacing rather than stabilising removing the asbestos once and for all.
https://vintage-radio.net/forum/showthread.php?t=148000

It’s a very small amount and a one off job so I believe the risk is minimal but I’ll still do it outside and bag it up.

Our NHS site talks about the risk and says.
When the dust is breathed in, the asbestos fibres enter the lungs and can gradually damage them over time. But you would need prolonged exposure to asbestos fibres, usually over many years, before you develop asbestosis. I’ve only got one so my risk assessment concludes don’t worry just get it out.
https://www.nhs.uk/conditions/asbestosis/

The official view of procedures for removal from a ‘period’ appliance is here:
http://www.hse.gov.uk/pubns/guidance/a32.pdf


John
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Old 30th Jun 2019, 8:27 am   #20
stevehertz
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Default Re: Bush DAC 90 Asbestos Problem

Quote:
Originally Posted by bobbyd123 View Post
Looks like there is no solution
Are you not reading the same replies as I am?!
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