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KF Sight Glasses
KF sight glasses designed for vacuum hygienic applications. The glass is fused to the metal conforming to DIN 7079 where the glass is Borosilicate per DIN 7080. These sights are sealed to the process vessel with an elastomer gasket. Use standard KF clamps to mount the sight windows to the process vessel. For hygienic applications use Tri Sanitary Clamps. KF sight glasses are manufactured to high tolerances with electropolished metal surfaces for improved cleanliness.
Metaglas, Herberts Industrieglas GmbH & Co. KG
KF Sight Glasses for MetaClamp(R), Borosilicate Fused to Duplex Steel Housing

KF sight glass for high vacuum and hygienic applications. Simple to install with no risk of breakage, this is a single-piece part ideal for use on food processing equipment (A3-Standard). Reliable against total failure - possibility of sudden unexpected rupture is totally excluded. This sight glass has a trade name MetaClamp(R) designed to be sealed to the process vessel with an elastomer gasket using a Tri Sanitary clamp. Standard KF clamps will also work but with less precision in clamping and without compliance for hygienic applications.
This KF sight glass is manufactured to high tolerances and comes standard with surface finish 10 Ra microinches, with optional electropolish for improved cleanliness. Borosilicate glass DIN 7080 is fused to metal conforming to DIN 7079. Housing is made from Duplex Stainless Steel 2205 (1.4462), with material certificate traceable to the metal manufacturer. Manufactured and tested in conformance with A.D. Standard Series H.P. & A.D. standard WO/TRD 100.
The sight glass has an uninterrupted surface from glass to metal, with no crevices trapping bacteria. No epoxies, no internal seals, just pure borosilicate glass-to-metal fusion. Supplied with Certificate of Conformity to EN 10204-3.1B or 3.1A.
KF Size | Aperture Dia. | Flange OD | Max Operating Pressure | Housing Material | Window Material | Max Operating Temp. | Mfg P/N | Encole P/N | Price | |
---|---|---|---|---|---|---|---|---|---|---|
1/2, 3/4 | 10 mm | 25 mm | 230 psi | Duplex 2205 | Borosilicate | 232 C | METACLAMP-.50S | 773E1101 | $ 269.00 each | |
1, 1-1/2 | 25 mm | 51 mm | 230 psi | Duplex 2205 | Borosilicate | 232 C | METACLAMP-1S | 773E1102 | $ 269.00 each | |
2 | 30 mm | 64 mm | 230 psi | Duplex 2205 | Borosilicate | 232 C | METACLAMP-2S | 773E1103 | $ 284.00 each | |
2-1/2 | 35 mm | 78 mm | 230 psi | Duplex 2205 | Borosilicate | 232 C | METACLAMP-2.5S | 773E1104 | $ 340.00 each | |
3 | 40 mm | 91 mm | 150 psi | Duplex 2205 | Borosilicate | 232 C | METACLAMP-3S | 773E1105 | $ 376.00 each | |
3-1/2 | 50 mm | 106 mm | 150 psi | Duplex 2205 | Borosilicate | 232 C | METACLAMP-3.5S | 773E1106 | $ 482.00 each | |
4 | 55 mm | 119 mm | 150 psi | Duplex 2205 | Borosilicate | 232 C | METACLAMP-4S | 773E1107 | $ 540.00 each | |
6 | 75 mm | 167 mm | 85 psi | Duplex 2205 | Borosilicate | 232 C | METACLAMP-6S | 773E1108 | $ 1093.00 each | |
8 | 100 mm | 218 mm | 85 psi | Duplex 2205 | Borosilicate | 232 C | METACLAMP-8S | 773E1109 | $ 1420.00 each | |
10 | 120 mm | 268 mm | 85 psi | Duplex 2205 | Borosilicate | 232 C | METACLAMP-10S | 773E11010 | $ 1966.00 each | |
12 | 140 mm | 319 mm | 85 psi | Duplex 2205 | Borosilicate | 232 C | METACLAMP-12S | 773E11011 | $ 2933.00 each |
Metaglas, Herberts Industrieglas GmbH & Co. KG
KF Sight Glasses for MetaClamp(R), Borosilicate Fused to Hastelloy C-22 Housing

KF sight glass for high vacuum and hygienic applications. Simple to install with no risk of breakage, this is a single-piece part ideal for use on food processing equipment (A3-Standard). Reliable against total failure - possibility of sudden unexpected rupture is totally excluded. This sight glass has a trade name MetaClamp(R) designed to be sealed to the process vessel with an elastomer gasket using a Tri Sanitary clamp. Standard KF clamps will also work but with less precision in clamping and without compliance for hygienic applications.
This KF sight glass is manufactured to high tolerances and comes standard with surface finish 10 Ra microinches, with optional electropolish for improved cleanliness. Borosilicate glass DIN 7080 is fused to metal conforming to DIN 7079. Housing is made from Hastelloy C-22 (UNS N06022), with material certificate traceable to the metal manufacturer. Manufactured and tested in conformance with A.D. Standard Series H.P. & A.D. standard WO/TRD 100.
The sight glass has an uninterrupted surface from glass to metal, with no crevices trapping bacteria. No epoxies, no internal seals, just pure borosilicate glass-to-metal fusion. Supplied with Certificate of Conformity to EN 10204-3.1B or 3.1A.
KF Size | Aperture Dia. | Flange OD | Max Operating Pressure | Housing Material | Window Material | Max Operating Temp. | Mfg P/N | Encole P/N | Price | |
---|---|---|---|---|---|---|---|---|---|---|
1, 1-1/2 | 25 mm | 51 mm | 230 psi | Hastelloy C-22 | Borosilicate | 232 C | METACLAMP-1HC22 | 1128E801 | $ 391.00 each | |
2 | 30 mm | 64 mm | 230 psi | Hastelloy C-22 | Borosilicate | 232 C | METACLAMP-2HC22 | 1128E802 | $ 426.00 each | |
2-1/2 | 35 mm | 78 mm | 230 psi | Hastelloy C-22 | Borosilicate | 232 C | METACLAMP-2.5HC22 | 1128E803 | $ 576.00 each | |
3 | 40 mm | 91 mm | 150 psi | Hastelloy C-22 | Borosilicate | 232 C | METACLAMP-3HC22 | 1128E804 | $ 647.00 each | |
3-1/2 | 50 mm | 106 mm | 150 psi | Hastelloy C-22 | Borosilicate | 232 C | METACLAMP-3.5HC22 | 1128E805 | $ 973.00 each | |
4 | 55 mm | 119 mm | 150 psi | Hastelloy C-22 | Borosilicate | 232 C | METACLAMP-4HC22 | 1128E806 | $ 1172.00 each | |
6 | 75 mm | 167 mm | 90 psi | Hastelloy C-22 | Borosilicate | 232 C | METACLAMP-6HC22 | 1128E807 | $ 2038.00 each | |
8 | 100 mm | 218 mm | 90 psi | Hastelloy C-22 | Borosilicate | 232 C | METACLAMP-8HC22 | 1128E808 | $ 2635.00 each |