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Glassbower's glasses info
Aura Lens Products, Inc. 1996 Glass Workers Catalog 2
02/05/96
General Information
This information is offered as a guideline to your choice of material, and is
not meant to make or offer recommendations. Always consult with your eye care
professional before using any protective eyewear.
Aura Lens Products, Inc. manufactures five different glass lens types to
absorb ultraviolet and infrared radiation when working with hot glass and high
temperature furnaces or ceramic kilns. When using this equipment, in almost all
cases, infrared radiation is generated and in some cases, ultraviolet radiation
is also generated This is particularly the case when working with temperatures
in excess of 1,000 degrees F., the higher the temperature, the higher the
radiation.
Using gas torches and particularly torches using propane/oxygen,
hydrogen/oxygen, and natural gas/oxygen, much higher temperatures are needed to
work borosilicate, Pyrex, quartz, and Vicor, high amounts of radiation are
generated on these glass types.
When working with materials high in sodium and using any combination of gases
and oxygen, a condition called "Sodium Flare" is generated. It is noticed by a
pronounced yellow ball around the material being worked. This flare is located
at the center of the visible spectrum from 570nm to 590nm, and this area is most
perceived by the eye. All of the five lens types that Aura Lens manufactures
will filter out this flare.
All of our lenses are supplied in a variety of frames, dress, industrial, as
well as clip-on's. Most of the lenses can be supplied with a single vision
prescription, some in bifocals, all can be supplied in piano (non-prescription).
On a custom basis, we can design special notch filters to eliminate specific
wavelengths of light. These filters are quoted on a special order basis only.
Rose Didymium
This is the classic filter that has been used for many years in all types of
hot glass applications, as well as kiln working. The lens is dichroic (exhibits
different colors under various light sources). Under incandescent light, the
lens is a pronounced red color, but changes to greenish blue under fluorescent
light.
The spectral analysis of this glass at 3.2 mm thick indicates that it has good
protection against ultraviolet radiation up to 360 nm, has excellent filtration
at the sodium line, and excellent overall visible transmission from 400 nm to
725 nm. The glass does not offer much protection in the near or mid infrared
ranges.
In general, this lens is adequate for many glass working applications where the
amount of radiation generated is low.
Suggested usage is occasional examination of small kilns, jewelry work, bead
making using a propane torch, and enameling in low volume.
AUR-92
This material was originally developed for enhancement of the primary colors
Red, Green, and Blue. The spectral analysis of this glass filter shows it to be
very efficient in eliminating the sodium flare, along with very good ultraviolet
protection to 390 nm, and much improved infrared protection in the 750 nm to
1000 nm range.
A side benefit of this filter is the apparent improvement in judging the color
temperature of the glass while working it.
Suggested uses are: lamp working of beads and small sculptures, as well as
gazing into a kiln while fusing glass or enameling.
Green Didymium, Shades 4 and 5
These glass filter types were originally developed to offer protection and
filtration in gas welding of aluminum and other light to medium cutting and
welding applications where gas is used.
It offers good filtration of the sodium flare. The major drawback of these
filters is that they are quite dark, and should be used only at the bench or at
the glory hole while doing gathers. The shade 4 filter averages about 13%
visible light transmission, and the shade 5 filter averages about 5% visible
light transmission. Both shades offer excellent ultraviolet and infrared
radiation protection.
Note that the total transmission for both of these filters is reduced in
comparison to the other filters in this catalog.
AWG-186
This filter is an enhanced version of the AUR-92. It has added infrared
absorption that the AUR-92 does not have.
The AGW-186 filter was designed for hot glass workers that are working at the
furnace doing gathers and gazing into firepots. The AGW-186 consists of a base
lens of AUR-92 with an additional filter of infrared absorbing glass laminated
to it. This lens is heavier than AUR-92 and does not lend itself well to
corrective eyewear. The filter has very good visible light transmission,
averaging 60 to 70%, with excellent absorption of the sodium flare.
The filter is laminated with a high quality optical cement and cannot be
tempered to improve impact resistance. This lens DOES NOT meet the requirements
of ANSI Z87.1 1989 for occupational eye protection. WE STRONGLY RECOMMEND THE
USE OF A FACE SHIELD WHEN USING THIS FILTER. The filter does meet the ANSI
Z80.1 1987 section 4.6.2 and 4.6.3 for custom made laminates and cemented
assemblies.
AGW-200
The AGW-200 lens was developed to answer requests for even better ultraviolet
and infrared radiation protection while also reducing the light level perceived
by the eye.
It consists of a base lens of AUR-92 with a thin layer of either shade 4 or
shade 5 Green Didymium cemented to the lower half of the base lens. This unique
assembly gives the wearer the ability to see by raising the eye to look over the
top of the darker lens, and still have improved filtering characteristics of the
dark glass on the lower half. This is very desirable when working with high
pressure torches and glass requiring very high temperatures.
The filter is laminated with a high quality optical cement and cannot be
tempered to improve impact resistance. This lens DOES NOT meet the requirements
of ANSI Z87.1 1989 for occupational eye protection. WE STRONGLY RECOMMEND THE
USE OF A FACE SHIELD WHEN USING THIS FILTER. The filter does meet the ANSI
Z80.1 1987 section 4.6.2 and 4.6.3 for custom made laminates and cemented
assemblies.
ORDERING INFORMATION
Aura Lens
Products, Inc. ALL PRICES INCLUDE FRAME OF YOUR CHOICE
Rose Didymium Green Didymium
Plano $110.00 Plano
$135.00
Single Vision Prescription 145.00 Single Vision Prescription
165.00
Bifocal Prescription 170.00 Bifocal Prescription
185.00
Trifocal Prescription 200.00 Trifocal Prescription
215.00
Aur-92** AGW - 200
Plano $145.00 Plano
$235.00
Single Vision Prescription 175.00 Single Vision Prescription
265.00
Bifocal Prescription 205.00
Trifocal Prescription 230.00
* When ordering the Clip-On frames, please deduct $20.00.
** Enhanced AGW-186 (To remove 98% of Infra Red - Plano and SV only) Additional
$60.00
TO ORDER
Fill out the order form below and either mail it with a check or charge by
American Express (please include number and expiration date).
Patient Name:
Address:
Telephone Number:
Frame: Lens Type:
Check #: American Express #: Exp.:
Complete the following section only if you are ordering Prescription Eye Wear I
Sphere Cylinder Axis Prism
Right Eye
Left Eye
Pupiliary Distance (Far):
Pupiliary Distance (Near):
Complete for Bifocals only:
Add Power: Segment Size:
Segment Height:
Pupiliary distance(s) are REQUIRED for all prescription eye wear. We cannot
make prescription eye wear without your PD's ! If your current prescription does
not have your PD written on it, please take your prescription to any optometrist
or dispenser and have your PD measured. Prescription eye wear and special
orders are not returnable. Prices effective June 1. 1995.
Copyright 1995 by Aura Lens Products, Inc.
Post Office Box 763 . St. Cloud . MN - 56302-0763
330 1 st Avenue SE . Rice. MN 56367
(612) 393-3182 . FAX (612) 393-3188 . WATS (800) 281-2872
E-mail from: Tom Biebel, 15-Feb-1996
- Neoman
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