Description
ND20 polypropylene screw cap in white is a closed-top closure fitted with a 1,3 mm silicone white / PTFE red septum for secure sealing of compatible 20 mm neck vials. The PP cap body offers a lightweight, chemically practical housing for laboratory sample storage and chromatographic preparation, while the dual-layer septum combines silicone elasticity with a PTFE sample-facing surface to limit analyte interaction and support clean needle penetration. Packaged as 10 × 100 pieces per pack (1 000 caps total), the configuration suits busy analytical environments that consume large numbers of uniform closures. This screw cap from manufacturer Altmann Analytik is specified as closed (non-open-hole), making it appropriate where a full septum barrier is preferred until piercing. Typical applications include headspace-related sample handling, volatile organic analysis, and general vial-based workflows that standardise on ND20 geometry. White cap colour aids visual organisation on the bench, and the defined 1,3 mm septum thickness supports predictable sealing force and autosampler compatibility within ND20 screw systems.
This article is part of Screw caps & closures, in Stoppers, caps & closures.
Key features
- Pack size: 10 × 100 pcs (1 000 pc(s))
- Product type: ND20 screw cap, closed
- Cap material: Polypropylene (PP), white
- Septum: 1,3 mm silicone white / PTFE red
- Neck finish: ND20
- Closure style: Closed top
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Questions about ND20 PP screw cap, white, closed, 1,3mm, 10 x 100 pc
What is this article?
ND20 PP screw cap, white, closed, 1,3mm, 10 x 100 pc is the article on this page. Luminix Health distributes Altmann Analytik for laboratory use. It sits in Screw caps & closures, inside Stoppers, caps & closures, in Labware.
A screw cap has a thread and a liner. The thread has to match the bottle. The liner has to survive the liquid: a pulp liner fails in a solvent that a PTFE-faced liner ignores. The colour of the cap is not the specification.
A closure is the part that decides whether a bottle stays shut and whether the contents attack the seal. A ground-glass stopper matches a ground neck. A screw cap needs the right thread and a liner that survives the liquid. Rubber and silicone stoppers push into a mouth. The liner, not the colour of the cap, is the chemical choice. The vessels they close are indexed under ISO laboratory glassware.
Which category should I open next?
The category is Stoppers, caps & closures. The sub-category is Screw caps & closures. The catalogue is Labware.
Shelves beside this one are Rubber & silicone stoppers, Ground-joint glass stoppers, Lids & seals and Closures (other).
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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The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.