Description
Septum, 20 mm diameter, silicone blue transparent/PTFE transparent is a laboratory septum intended for analytical vial sealing and sample introduction. The construction pairs blue transparent silicone with a transparent PTFE facing, offering resilient sealing from the elastomer layer and a chemically resistant sample-contact surface from the PTFE film. Diameter is 20 mm, thickness is 3,0 mm and hardness is specified at 45° Shore A, providing a defined mechanical profile for compatible closures in chromatography and general laboratory use. Supplied as 1000 pieces per pack from manufacturer Altmann Analytik, the septum supports standardised workflows in GC, LC and headspace applications where operators prefer a transparent blue silicone/PTFE combination for visual distinction on the bench. The dual-material design balances needle penetrability and reseal behaviour with reduced interaction at the PTFE interface, helping laboratories maintain consistent sealing performance across large sample series without altering established 20 mm vial formats.
This article is part of Vial caps & septa, in Vials, caps & septa.
Key features
- Pack size: 1000 pc(s)
- Product type: Septum
- Diameter: 20 mm
- Material: Silicone blue transparent/PTFE transparent
- Hardness: 45° Shore A
- Thickness: 3,0 mm
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Questions about Septa, 20 mm diameter, silicone blue transp./PTFE transp., 45° shore A, 3,0mm
What is this article?
Septa, 20 mm diameter, silicone blue transp./PTFE transp., 45° shore A, 3,0mm is the article on this page. Luminix Health distributes Altmann Analytik for laboratory use. It sits in Vial caps & septa, inside Vials, caps & septa, in Chromatography equipment.
A vial cap and a septum have to match the vial neck: crimp, screw or snap, and the diameter. The septum material, PTFE/silicone or rubber, decides chemical resistance and how many times a needle can pierce it. A septum that sheds into the solvent becomes ghost peaks.
An autosampler vial is the small closed bottle a chromatograph picks up. The neck is crimp, screw or snap, and the cap and the septum have to be that neck. The septum is the part the needle pierces. A soft septum reseals. A septum that is wrong for the solvent swells or sheds particles into the sample. Inserts reduce the volume when the sample is scarce. The separation they feed is described with IUPAC names and PubChem data.
Which category should I open next?
The category is Vials, caps & septa. The sub-category is Vial caps & septa. The catalogue is Chromatography equipment.
Shelves beside this one are Chromatography accessories, Autosampler vials, Crimpers & decappers and Vial inserts.
What should I check before I order?
When this page shows a safety data sheet, use that manufacturer file. Hazard text does not belong in the sales description. For a pack size, a grade or a certificate that is not on the page, send a quote request or contact the team.
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Luminix Health distributes this article from the heart of Europe. Articles in stock ship within 2–5 business days. Standard delivery is free from €250 excl. VAT. Cold-chain goods and dangerous goods under ADR are never included in that free delivery. The terms are in the Shipping Policy. The full brand index is on shop by brand. Who we are is on about us.
Which other categories should I open?
The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.