Optical Windows

Optical windows with parallel flat faces. Optical Windows should be selected based on the material transmission and mechanical properties of the window material.


Quartz Windows, GE 124

Quartz windows for circular sight glasses. The windows are made from GE Type 124 fused quartz. Flat sides are polished to 60-40 S-D optical clarity, typical of commercial quality. Edges are chamfered, the round surface is as ground.

Window Dia.ThicknessWindow MaterialMfg. P/N.Encole P/N.Price
1.000 inch0.260 inchQuartz100832327A1000$188.30each
2.000 inch0.500 inchQuartz100833327A1001$242.90each
3.000 inch0.820 inchQuartz100834327A1002$299.40each
4.000 inch1.350 inchQuartz100835327A1003$387.65each
6.000 inch2.150 inchQuartz100836327A1004$442.50each
Papenmeier - F. H. / Lumiglas

Lumiglas Sight Glass Discs, Borosilicate

Toughened borosilicate round windows. Edges are chamfered, cylindrical surface is ground and polished. Flat faces have optical finish 40-60 S-D. This window is designed to fit Lumiglas sight glass fittings meeting DIN 28120 with weld-on pads, and also DIN 11851 sight glasses with a screwed on cover flange.

For safety compliance in accordance with DIN 7080 the window must be replaced every time a sight glass assembly is disassembled during scheduled or unplanned maintenance. Once the sight glass disc is removed it should be discarded and not reused, especially on vessels under pressure or vacuum. The glass and the gaskets should be replaced during every time the assembly is taken apart.

Maximum operating pressure can be achieved only when the window is properly installed and tightened with the torque setting and criss-cross tightening pattern recommended for the sight glass assembly. Max operating temperature is 280 degrees C, no lower temperature limit. The window provides distortion-free viewing inside process chambers, mixers, pipelines, silos, food processing vessels. Not recommended for prolonged use with demineralized water.

Nominal SizeWindow Dia.ThicknessMfg. P/N.Encole P/N.Price
ISO-225250.00 mm30.00 mmNot Available317A1025$571.00each
ISO-225250.00 mm25.00 mmNot Available317A1024$578.00each
ISO-175200.00 mm30.00 mmNot Available317A1023$524.00each
ISO-175200.00 mm25.00 mmNot Available317A1022$510.00each
ISO-175200.00 mm20.00 mmNot Available317A1021$492.00each
ISO-150175.00 mm25.00 mmNot Available317A1020$479.00each
ISO-150175.00 mm20.00 mmNot Available317A1019$425.00each
ISO-150166.00 mm15.00 mmNot Available317A1018$354.00each
ISO-125150.00 mm25.00 mmNot Available317A1017$320.00each
ISO-125125.00 mm20.00 mmNot Available317A1016$318.00each
ISO-125142.00 mm15.00 mmNot Available317A1015$183.00each
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L.J. Star, Inc

Window, Obround Weld Pad Gage

Replacement glass for L.J. Star obround weld pad gauges. This safety glass is suitable for ASME code requirements. The tempered borosilicate window has optical finish on the flat sides without anti reflective coating, edges are ground.

LengthThicknessWidthWindow MaterialMfg. P/N.Encole P/N.Price
25.187 inch0.750 inch5.187 inchBorosilicate020049-014356A1014$975.00each
19.187 inch0.750 inch5.187 inchBorosilicate020049-011356A1013$879.80each
13.187 inch0.750 inch5.187 inchBorosilicate020049-008356A1012$824.90each
7.187 inch0.750 inch5.187 inchBorosilicate020049-004356A1011$378.20each
25.187 inch0.625 inch4.187 inchBorosilicate020049-013356A1010$576.50each
19.187 inch0.625 inch4.187 inchBorosilicate020049-010356A1009$612.50each
13.187 inch0.625 inch4.187 inchBorosilicate020049-007356A1008$485.50each
7.187 inch0.625 inch4.187 inchBorosilicate020049-003356A1007$348.70each
25.187 inch0.375 inch3.187 inchBorosilicate020049-012356A1006$458.90each
19.187 inch0.375 inch3.187 inchBorosilicate020049-009356A1005$405.90each
13.187 inch0.375 inch3.187 inchBorosilicate020049-006356A1004$275.80each
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Auer Lighting

Level Gage (Gauge) Transparent Glass

Obround glass for rectangular and obound level gauges glasses. The material is SUPRAX® 8488 high purity borosilicate glass, a trademark of Schott AG, offering excellent chemical compatibility and high resistance to thermal shock. This window is transparent allowing for unobstructed view into the pressure vessel. Manufactured by Auer Lighting GmbH under MAXOS® name.

LengthThicknessWidthWindow MaterialMfg. P/N.Encole P/N.Price
340.00 mm17.00 mm34.00 mmBorosilicateT-340-34-17356A1029$72.38each
320.00 mm17.00 mm34.00 mmBorosilicateT-320-34-17356A1028$68.48each
280.00 mm17.00 mm34.00 mmBorosilicateT-280-34-17356A1027$65.08each
250.00 mm17.00 mm34.00 mmBorosilicateT-250-34-17356A1026$61.73each
220.00 mm17.00 mm34.00 mmBorosilicateT-220-34-17356A1025$60.03each
190.00 mm17.00 mm34.00 mmBorosilicateT-190-34-17356A1024$58.38each
165.00 mm17.00 mm34.00 mmBorosilicateT-165-34-17356A1023$55.16each
140.00 mm17.00 mm34.00 mmBorosilicateT-140-34-17356A1022$53.68each
115.00 mm17.00 mm34.00 mmBorosilicateT-115-34-17356A1021$48.88each
508.00 mm15.00 mm25.00 mmBorosilicateT-508-25-15356A1020$83.35each
457.00 mm15.00 mm25.00 mmBorosilicateT-457-25-15356A1019$76.50each
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