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High-Temperature Silicone O-Rings — Furnace Tube Sealing

High-Temperature Silicone O-Rings — Furnace Tube Sealing

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High-temperature silicone O-rings designed for sealing laboratory tube furnaces, vacuum flanges and quartz or alumina furnace tubes. Available for tube outer diameters from 25 to 150 mm, with selected dimensions optimized for reliable elastic sealing in thermal processing and controlled-atmosphere systems. Supplied as a pair.

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S4R High-Temperature Silicone O-Rings are designed for sealing laboratory tube furnaces, vacuum flanges and furnace tubes used in thermal processing systems. Their elastic silicone construction provides a practical sealing interface for quartz, alumina and compatible laboratory tubes. A broad selection of sizes is available for furnace tubes from 25 to 150 mm outer diameter.

Key Features

✓ High-temperature silicone rubber construction
✓ Designed specifically for laboratory tube furnace sealing
✓ Elastic sealing interface for vacuum flange assemblies
✓ Suitable for quartz, alumina and compatible furnace tubes
✓ Wide selection for 25 to 150 mm tube outer diameters
✓ Supplied as a pair for convenient furnace maintenance

Typical Applications

• Laboratory tube furnaces
• Quartz furnace tube sealing
• Alumina furnace tube sealing
• Vacuum flange assemblies
• Controlled-atmosphere thermal processing
• Furnace maintenance and replacement sealing
Technical Specifications
Material High-Temperature Silicone Rubber
Cross-Section Circular
Primary Application Tube Furnace & Vacuum Flange Sealing
Tube Compatibility Quartz, Alumina and Compatible Laboratory Tubes
Sales Unit Pair of 2 O-rings
Available Sizes & Dimensions
Furnace Tube OD O-Ring ID Cross Section O-Ring OD
25 mm 24 mm 5.0 mm 34 mm
30 mm 28 mm 5.0 mm 38 mm
40 mm 38 mm 5.0 mm 48 mm
50 mm 48 mm 5.0 mm 58 mm
60 mm 58 mm 5.0 mm 68 mm
70 mm 68 mm 5.0 mm 78 mm
80 mm 78 mm 5.0 mm 88 mm
90 mm 88 mm 5.0 mm 98 mm
100 mm 97.5 mm 5.3 mm 108.1 mm
120 mm 118 mm 5.3 mm 128.6 mm
130 mm 128 mm 5.3 mm 138.6 mm
150 mm 148 mm 5.3 mm 158.6 mm
Furnace Tube OD indicates the nominal compatible tube diameter. O-ring dimensions are nominal values. Selected intermediate sizes are based on the dimensional progression of the furnace sealing series and should be verified for critical flange installations.
Package Contents
2×
High-Temperature Silicone O-Rings
Installation & Temperature Notice
Silicone O-rings used on tube furnace flanges should be installed outside the direct heated zone and protected from excessive thermal radiation. Actual operating capability depends on the silicone formulation, flange geometry, vacuum conditions, compression and installation. Verify compatibility and dimensions before use in critical sealing applications.

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