Magnetic Headspace Caps: Aluminium & Bimetal Options

Our closures for Headspace vials are packed in clear screw-top PET jars for an easy and contamination free handling in the laboratory.

Available aluminium caps with centre hole:

10 mm centre hole
magnetic bimetal, 8 mm centre hole for CTC Combi PAL
with pressure release covering the injection site, 8 mm centre whole
with centre tear-off covering the injection site for quality assurance, 8 mm centre hole
with complete tear-off covering the injection site for quality assurance, 8 mm centre hole
FlipOff^® with plastic FlipOff^® button covering the injection site for quality assurance, 8 mm centre hole

Polyethylene caps lined with silicone/PTFE septum to be used with wash vials

Find a detailed description of the available septum material in the taps below:

ms-Pure septum: non-pigmented silicone/PTFE septum

With the increasing sensitivity of the analytical instruments, extractable substances from the septum may contaminate the sample. The ms-Pure silicone/PTFE septum is produced from a natural non-pigmented silicone/PTFE. Tests show that it is 60 % cleaner than „standard“ silicone/PTFE septums on the market.

non-pigmented silicone of highest qualitylow bleeding
low bleeding
resists coring
excellent re-seal ability
intended for multiple injections
low compression set for storage reliability

Butyl rubber and Butyl rubber/PTFE septum

Butyl is a synthetic caoutchouc, which is temperature resistant from -40° C to 120° C.

Without the PTFE layer this septum is an economic alternative for non-critical analysis (eg. in breweries or for blood alcohol analysis).
With a PTFE layer this septum is also suitable for critical analysis.

Pharma-Fix septum
The PTFE liner of the Pharma-Fix septum does not cover the complete butyl surface. A small circular rim is left in the width of the crimp head rim. The elastic butyl resting on the crimp head rim seals far better than the slippery surface of the PTFE.

High temperature septum

pigmented silicone/aluminium
suitable for temperatures above 170° C
alternative to a PTFE lined septum, when the PTFE interferes with the analysis

ZeroSept^® Air - phthalate free Septum

The ZeroSept^® Air septum gains its excellent sealing qualities from an air cushion trapped between two layers of high-purity PTFE foil which makes it also ideal for multiple injections.

When using a silicone or rubber septum, the needle piercing the septum will always carry some septum material into the sample which may lead to interfering peaks in the chromatogram. The ZeroSept^® Air septum eliminates the risk of interfering peaks through coring.

Tests proofed that the ZeroSept^® Air septum also shows adequate sealing qualities over a period of 24 hours when used with multiple injections.