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  #21  
Old 08-20-2012, 02:47 AM
jack39 jack39 is offline
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Also found these on Ebay which look to be Sellstrom Shade # 6.
http://www.ebay.com/itm/170770695989...84.m1497.l2649
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  #22  
Old 08-27-2012, 01:17 PM
David Gardiner David Gardiner is offline
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Looking at your link Jack I found just the lenses which would possibly be better for us non- USA residents.

http://www.ebay.com/itm/IR-PC-Polyca...05%26rk%3D3%26

long link but I hope it works.

I read somewhere (can't remember where) that cobolt blue lenses do not offer proper protection, anyone got any views?

David
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  #23  
Old 08-27-2012, 08:53 PM
ferguson ferguson is offline
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just got to be careful which cobalt blue lenses you buy!basic ones cut the glare very effectively-but have minimal protection from ultraviolet and infra red light.trouble with infra red is it doesn't hurt if you get too much-just damages eyes slowly.you only find out too late that damage done.good blue cobalt lenses cut out both uva and uvb light as well as blocking infra red .suggest you look for glass furnace workers glasses because they meet all the required criteria
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  #24  
Old 08-27-2012, 09:50 PM
Richard-S Richard-S is offline
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I have used Kent White's aluminum lens for maybe 10 years now. I buy supplies from him, even when the price is higher, because I trust him. I value my eyes over a few dollars. I know Kent by telephone and e-mail only. Any time I hit a hard place in my metal shaping or welding he answers my questions immediately. Sometimes in four or five e-mails as I feed back my progress to him. He is a real asset.
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  #25  
Old 08-27-2012, 11:39 PM
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mwilliams mwilliams is offline
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Is anyone using Didymiun Glasses? I have had a pair for years and they work great. I think that they are primarialy used in the glass blowing industry.
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  #26  
Old 08-28-2012, 04:36 AM
jack39 jack39 is offline
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Quote:
Originally Posted by David Gardiner View Post
Looking at your link Jack I found just the lenses which would possibly be better for us non- USA residents.

http://www.ebay.com/itm/IR-PC-Polyca...05%26rk%3D3%26

long link but I hope it works.

I read somewhere (can't remember where) that cobolt blue lenses do not offer proper protection, anyone got any views?

David
Thanks David , (and everyone else)

My understanding is the Cobalt Blue glass lens filters out the InfraRed rays , and the clear poycarbonate protective lense at the front of the goggles filters out the UVB and UVC rays.

I used to work in the NDT field in Aviation, and Black Light ( UV ) was used in fluorescent penetrant inspections. The light source was checked daily with a light intensity meter to ensure the correct amount of wattage was being used during inspection. If a piece of polycarbonate (clear polycarbonate saftey glasses for example)was placed between the light source and the light meter , the UV light measured was zero.

The ebay add for the goggles with the shade 6 Cobalt IR lens , also comes with the polycarbonate clear lens for the UV filtering ( even though it is clear)
I have purchased a set of the goggles in my link and will post any other standards included with the goggles when they arrive.

I think if you just used the cobalt blue lenses without a clear polycarbonate then the UV light may be damaging to your eyesight.

http://www.cutlikeplasma.com/qs30/pr...66&detail=true
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Last edited by jack39; 08-28-2012 at 04:44 AM.
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  #27  
Old 08-28-2012, 10:43 AM
ferguson ferguson is offline
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uv damaging eyes is a hassle but at least you know it is happening-because it hurts.infra red more sneaky because you are totally unaware of it happening and its accumulative!
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  #28  
Old 08-28-2012, 03:41 PM
jack39 jack39 is offline
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This link is the sellstrom info for there cobalt blue range.

http://www.sellstrom.com/Websites/se...ue%20Flyer.pdf
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  #29  
Old 08-28-2012, 06:14 PM
David Gardiner David Gardiner is offline
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Cheers Jack I just thought the lense would be cheaper to ship and no import duty 'cos its less that thirty quid, the goggles are available in the UK. Thanks for the info.

David
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  #30  
Old 08-28-2012, 06:52 PM
hotrodder hotrodder is offline
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The Sellstrom cobalt blue flyer... the lenses pictured look a green-blue colour to me. I thought the traditional cobalt blue lenses were actually blue? Heading more into general rambling territory...

as i understand it green lenses are naturally good at blocking/absorbing light from the red end of the spectrum. Maybe one of the reasons green is the traditional colour for welding lenses?

Amber/yellow lenses are naturally good at blocking light from the blue end of the spectrum. They improve contrast and detail on overcast days snowboarding, cycling etc because light from the blue end of the spectrum scatters more easily making details harder to pick out. Blue lenses block yellow light which is obviously handy when fluxes or something else is producing a yellow - orange glare

I'm thinking (alright, guessing ) that modern materials and lens coatings may change things a lot regarding protection from IR and UV i.e. things like the warnings about cobalt lenses probably only apply to the origional flavour/old stock etc?

I've no idea whether these are any good from an optical clarity perspective or with regards to IR as they only mention that the oxy fuel glasses don't provide enough UV protection for plasma cutting but FWIW... http://www.plasmatech.co.uk/page/safety-glasses They are cheap but then cheap is no good if you can't see what you're doing properly and/or aren't protected properly

There's a crude non-quantitive way of testing for IR along the same lines as Jack's comments about polycarbonate and UV... TV remote 'light' can be seen by digital cameras for example. The same TV remote will also switch my Speedglas to it's dark state while sunlight/light bulbs/strip lights don't. Bizarrely it also reacts to LCD screens
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