Description
BOLA Cap Seals S 40 are dual-layer laboratory sealing inserts for S 40 threaded closures, combining a PTFE contact face with a silicone elastomer backing. Each seal measures 38,0 mm in diameter with an approximate thickness of 3,3 mm, dimensioned for S 40 threads. The PTFE upper side delivers the chemically resistant surface that meets the medium, while the silicone underside compensates for unevenness on the sealing face and ensures elastic, reliable seating. In service, only the PTFE layer contacts the process medium, helping shield the elastomer from aggressive chemicals and support sample integrity. These BOLA seals from manufacturer Bohlender suit laboratory bottles, vessels and apparatus fitted with S 40 connections where inert, dependable closure is required. Material on the media side is polytetrafluoroethylene (PTFE), with silicone elastomer on the reverse for compliance and fit. They are supplied in packs of 20 pieces, with a net weight of 0,006 kg per seal, for routine laboratory sealing tasks that call for PTFE-facing chemical resistance and flexible compensation on the thread sealing surface.
This article is part of Screw caps & closures, in Stoppers, caps & closures.
Key features
- Pack size: 20 pc(s)
- Thread size: S 40
- Seal diameter: 38,0 mm
- Seal thickness: approx. 3,3 mm
- Material: PTFE / silicone elastomer
- Media contact side: PTFE only
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Questions about BOLA Gaskets for caps, S 40, Ø 38,0 x 3,3 mm PTFE/silicone
What is this article?
BOLA Gaskets for caps, S 40, Ø 38,0 x 3,3 mm PTFE/silicone is the article on this page. Luminix Health distributes Bohlender 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.
How does ordering and shipping work?
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.