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PTFE/Silicone Septa & Cap Liners

PTFE/Silicone Septa & Cap Liners

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PTFE/silicone septa and cap liners designed for laboratory sample vials, reagent bottles and analytical containers. A chemically resistant PTFE contact face is combined with a compressible silicone backing to provide reliable closure sealing while limiting direct sample contact with the elastomer. Supplied in selected diameters from 8 to 27 mm in packs of 100.

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S4R PTFE/Silicone Septa & Cap Liners provide a practical sealing solution for laboratory sample vials, reagent bottles and analytical containers. The PTFE contact face provides broad chemical resistance, while the silicone backing supplies the compressibility required for reliable closure sealing. Selected diameters from 8 to 27 mm are available in laboratory packs of 100.

Key Features

✓ PTFE-faced silicone composite construction
✓ Chemically resistant PTFE contact surface
✓ Compressible silicone backing for reliable closure sealing
✓ Flat circular format for laboratory caps and closures
✓ Selected diameters from 8 to 27 mm
✓ Supplied in packs of 100

Typical Applications

• Laboratory sample vials
• Chromatography and analytical sample containers
• Reagent and chemical storage bottles
• Electrochemistry and battery research samples
• Solvent and electrolyte sample storage
• Replacement liners for compatible laboratory closures
Technical Specifications
Materials PTFE / Silicone
Construction PTFE-Faced Silicone
Format Solid, Non-Pre-Slit
Profile Flat Circular Disc
Size Designation Diameter × Thickness (Ø × T)
Color May vary by size; color does not define the product specification
Sales Unit Pack of 100 Septa / Liners
Available Sizes & Dimensions
Diameter Thickness
Ø8 mm 1.5 mm
Ø9 mm 1.0 mm
Ø12.5 mm 1.5 mm
Ø14.5 mm 1.5 mm
Ø17.5 mm 1.5 mm
Ø20 mm 3.0 mm
Ø22 mm 3.0 mm
Ø27 mm 3.0 mm
Dimensions are nominal values. Verify liner diameter, thickness and cap compatibility before use with a specific vial or closure system.
Package Contents
100×
PTFE/Silicone Septa & Cap Liners
Chemical & Closure Compatibility
The PTFE face provides broad chemical resistance while the silicone backing supplies sealing compression. Compatibility depends on the stored chemical, concentration, temperature, cap geometry and required sealing pressure. Verify septum dimensions and closure compatibility before use in critical analytical or chemical applications.

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