I.P.V.
 Specialty Sight and Gage Glass 

Sight, Gage and Specialty Glasses and FabricationTrust the experts at IPV for selection and fabrication of custom sight, gage and specialty glasses.

From prototypes and specialty quantities to large volume production, every order passes through several extensive levels of quality control, from first-piece inspection, to random sampling, to final checks just before shipment.


IPV's precision fabrication services include:

  • Chemical Strengthening
  • Convexing and Bending
  • Cutting
  • Decorating
  • Drilling
  • Edge Grinding
  • Milling
  • Surface Lapping and Polishing
  • Tempering
  • Waterjet Cutting
Corning MACBETH® Gage Glasses Schott Duran® Tubular Gage Glasses

Corning MACBETH Gage GlassesDrawing on more than 150 years of materials science and process engineering knowledge, Corning Incorporated is the world leader in specialty glass and ceramics.

Used as original glass in new gage assemblies as well as replacement glass in both steam and process applications, the MACBETH Brand Gage Glasses are considered by many to be the "Standard of the Industry."

These glasses are designed for use in armored-type liquid level gages. They are manufactured of borosilicate glass under carefully controlled conditions to provide a high-strength tempered glass with the greatest degree of visibility.

The three basic Corning MACBETH® gage glass types:

Type A, Plain, is designed for moderate pressure steam boilers and for liquid level indicators.

Type A, High Pressure will take non-steam pressure up to 5000 psi

Type B, Reflex, is made for extra ease in locating liquid levels. This gage glass has vertical prisms extending the full viewing length of the glass. The prism side faces the liquid reflect light brilliantly. Thus the liquid level stands out very clearly from a great distance away.

Schott Duran Tubular Gage GlassesMany years of experience allow SCHOTT to provide Duran 8330 tubular gage glasses that are preferred in a wide variety of industrial and commercial applications.

Duran tubular gage glass is offered as Red Line, Standard, Heavy Wall, High Pressure, and Heavy Wall Red Line.

Duran Tubular Gage GlassesDiameters range from 1/2" OD to 1 1/2" OD. End finishes may be cut, ground, or fire polished depending on application.

Pressure ratings up to 600 psi depending on end finish, diameter, and length required.

Specialty Glass



Annealed Borosilicate - Clear
Good for normal service where one surface is heated to a maximum temperature of 446°F (230°C), using 1/4" or thicker glass. The temperature difference between ambient and process should not exceed 150°F.

Tempered Borosilicate - Clear
Recommended for use where higher pressures are required than can be obtained with Annealed Borosilicate. Maximum service temperature is 500°F (260°C). No corrosion to surface, nor severe chill can be tolerated.

Cobalt Blue Furnace - Blue
Used to reduce glare when observing flame, smoke, and ash intensity in power plants and marine boilers. Thickness up to 1/4".

Vycor - Clear
Can be used continuously at 1652°F (900°C). The temperature difference between ambient and process surfaces should not exceed 600°F. Thickness up to 1/2". Excellent optical properties.

Fused Quartz - Clear
For industrial and laboratory applications. Can be used continuously at 1742°F (950°C). Commercial Grade is standard. Optical Grade is available.

Pyroceram - Amber Tint
This transparent glass-ceramic material will not delaminate at elevated temperatures. Available in 5mm thickness only. Mainly used in furnaces.

Glass For:
  • Furnaces, Ovens
  • Observation Equipment
  • Flow Indicators
  • Pressure Vessels/Tanks

Tempering
Tempering greatly increases the strength of glass and helps it overcome the damaging effect of scratches and other surface defects. Glass is heated to a specified point above its annealing temperature, then quickly quenched causing the surface to shrink and harden. While the interior cools more slowly it tries to shrink, putting itself in tension and creating a compressive stress on the surface. When completed, the surface compression must be overcome and a tensile stress introduced before the glass can be harmed. Thus, the mechanical and impact strength as well as the thermal shock resistance are improved greatly.

Pressure Chart for Circles

Unsupported Diameter - inches

  Note: All Glass should be protected from thermal shock, and shielding is recommended.
Pyrex Borosilicate Glass Circles - Blasted Edge
Pyrex Borosilicate


This glass has outstanding Quality and Clarity characteristics. It has a standard thickness of 3/4" and is made of borosilicate.

Annealed
This glass is used for the lower pressure applications

Tempered
This tempered glass is used for higher pressure applications.

Diameter PSIG
4"
5"
6"
6-3/4"
8-3/8"
150
100
60
45
30
4"
5"
6"
6-3/4"
8-3/8"
450
300
180
135
90
Flat Gauge Glass - Reflex & Transparent

Pyrex Borosilicate

Also available is 30mm wide
Reflex and Transparent
Gauge Glass and Almax II
Aluminosilicate.


Reflex
Width: 1.300-1.339"
Thickness: .661"-.689"
Flatness: .005"

Transparent
Width: 1.300-1.339"
Thickness: .661"-.689"
Flatness: .005"

HP Transparent.
Same as above except
Flatness: .002"

Our Flat Gauge Glass is manufactured from a special 8488 formulated borosilicate glass, characterized by low coefficient of expansion, high chemical durability, and exceptional homogeneity.

These glasses are used in armored gauges.

Pressure and Temperature Ratings
  Glass Size   Length Inches Steam Boiler, No Mica, Max Pressure at 470°F Steam Boiler, Mica Protected Max Pressure at 608°F Non-Steam Service Max Max Pressure at 100°F
1
2
3
4
5
6
7
8
9
4-1/2
5-1/2
6-1/2
7-1/2
8-5/8
9-7/8
11
12-5/8
13-3/8
500
PSIG
    Mica Not used with Reflex Gauge Glass   4000
PSIG
1
2
3
4
5
6
7
8
9
4-1/2
5-1/2
6-1/2
7-1/2
8-5/8
9-7/8
11
12-5/8
13-3/8
500
PSIG
1000
SIG
4000
PSIG
1
2
3
4
5
6
7
8
9
4-1/2
5-1/2
6-1/2
7-1/2
8-5/8
9-7/8
11
12-5/8
13-3/8
500
PSIG
1500
PSIG
5000
PSIG
 
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