Subject: Re: Eye protection

From: Dave B <[email-masked]>
Date: Tue, 21 May 1996 09:10:32 -0500

At 07:07 5/21/96 -0400, you wrote:
>UV protection is provided by the plastic lens.  It's my understanding 
>that the only effective IR protection is provided by gold-coated lenses.  
>There are glasses with dydimium or cobalt blue lenses and a gold 
>coating available which cost about $45.  If anyone is interested, I can 
>post the source.  The dydimium and cobalt lenses do help one "see" into 
>the fire, but are rather dark when looking elsewhere.
>
>D.C. Hufford
>
>
>
Yes, please post source info about the IR protecting glasses.

Dave B

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From: "daryl (d.a.) bender" <[email-masked]>
Date: Tue, 21 May 1996 16:13:00 -0400 [/PRMD=BNR/ADMD=TELECOM.CANADA/C=CA/;bcars520.b.664:21.04.96.20.14.12]

Lets see if I understand this. When welding one is concerned with;

IR
UV
Sodium Flare
"bright light"

If UV is not an issue and standard welding glasses provide IR & "bright 
light" protection. The only remaining issue is sodium flare. Do they 
work for that?

Daryl
[email-masked]

In message " Eye protection", [email-masked] writes:

>Standard welding glasses provide protection against IR as detailed in
>ANSI Z87.1 on eyewear (I don't have a copy unfortunately). Gold lenses
>work, but they are expensive and fragile (scratches). 
>
>--
>Steve Smith
>[email-masked]
>

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From: [email-masked] (John & Cynthia/ MidLife Crisis Ent.)
Date: Tue, 21 May 1996 19:21:58 +0200

>> Gold is a bit expensive and a bit fragile.  However, I have a lens that is
>> 15 yrs old and as long as it is kept behind clear protective lens covers
>> and the paper/cardboard/gasket like material spacers are in place between
>> the protective covers and the lense, it will last and last and last.  I now
>> use my electronic hood most of the time but I have 2 other hoods for
>> teaching, helpers or what ever.
>
>Thanks for your 2 cents. The piece I'm missing is what advantage does
>gold have? It seems like a welding lens gets you to the same place
>cheaper and more rugged.
>
>
>--
>Steve Smith
>[email-masked]

More or less yes you are correct.  The lens gives a different color, and to
me seems brighter than the standard green lenses.  Try one at your local
welding supply and see if you like it better.

John Dach and Cynthia Thomas
Maiden Metals
a div. of
MidLife Crisis Enterprises
PO BX 44
Philo, CA  95466           We see much, observe little and perceive less.
707-895-2635(phone/fax)
800-749-1981

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From: Ralph Snel <[email-masked]>
Date: Wed, 22 May 1996 11:34:03 METDST

> "bright light"

If I remember my spectroscopy right and understand what didydium does, the
following protection could be considered:

IR: gold. Won't do much good for anything else.
UV: almost any plastic and glass will do. Quartz will specifically not.
Sodium flare (line emission in orange light): didydium. If I understand right
this will not protect against much else, maybe UV.
Bright light (continuum emission): gray filter. These may let through IR and
UV, check the specs.

Disclaimer: this is an attempt to summarise things, I may be wrong, check
with someone who _realy_ knows.

Ralph Snel
[email-masked]
Sweden

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From: "[email-masked] 415.855.5707" <[email-masked]>
Date: Wed, 22 May 1996 06:48:02 -0800 (PST)

Standard welding glasses provide protection against IR, UV and bright light. 
They do nothing for sodium flare - except possibly make you realize how
annoying it is.  The old "Cobalt Blue" and Dydimum lenses work to reduce sodium
flare but offer little if any protection against UV and IR.  The ONLY lens that
I know of that has UV, IR, Sodium Flare and bright light protection is the
TM-2000 from TM-Technologies.  You can get the same protection by layering
cobalt blue lenses with a ANSI shade 4 welding lens but you won't be able to
see anything.

Joe