Turnover Flange Septa
Product Code : EL-TT-10184
Quick answer: A Turnover Flange Septa is a rubber sealing disc with a turned-over flange edge, used to stopper and reseal test tubes, sample vials and similar glassware, often for repeated needle penetration in sampling work.
Turnover Flange Septa — Available Options
| Material | Surface |
|---|---|
| Natural rubber | Non-serrated |
| Natural rubber | Serrated |
| Silicone rubber | Non-serrated |
| Silicone rubber | Serrated |
Sizes available: 12mm, 15mm, 18mm, 25mm.
Choosing a Septa Material and Finish
Natural rubber is a cost-effective general-purpose choice; silicone rubber offers better chemical inertness and heat resistance where the septa will see repeated autoclaving or contact with reactive samples. A serrated surface grips a needle tip more securely on repeated puncture, while a non-serrated (smooth) surface is the simpler option for single or infrequent access. Confirm tube or vial neck diameter against the 12-25mm size range when ordering.
Frequently Asked Questions
What materials are Turnover Flange Septa available in?
Two rubber materials are available — natural rubber and silicone rubber — each offered in serrated or non-serrated surface finish.
What sizes are available?
Four sizes are available: 12mm, 15mm, 18mm and 25mm.
What is the difference between serrated and non-serrated septa?
A serrated surface grips a needle tip more securely for repeated puncture, while a non-serrated surface is a simpler option for single or infrequent access.
Related Products
Other test tube closures and related items from Lab Glassware Manufacturer: Test Tubes Closure Cap, Test Tube with Joint and Stopper, and the full Test Tube range under Laboratory Test Tubes.
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Last updated: September 2026.