Due to the difficulties and inconveniences with crimping hard magnetic caps tightly, the market asked for a safe and more easy to use solution. Aside from the range of crimp neck vials for the CTC and their appropriate magnetic crimp closures, screw neck vials N 18 with a precision thread were introduced. They have a more convenient, consistent, and safer sealing process compared to crimping (better reproducibility). With their introduction the risk of inaccurate or inconsistent crimp results has been elliminated ensuring a safe run in the autosampler and reliable analysis results. Furthermore endusers save the costs for additional crimping tools. The non-standardized precision thread design with the increased number of threads achieves a firm contact pressure of the septa with the glass rim of the vial even under internal vial pressure (tightness). The thinner septum (1.5 mm instead of 3 mm with crimp caps) guarantees a safe penetration of the needle and less fragmentation which is especially important for SPME applications. The screw caps offer an always flat surface for the magnet; so that the filled vial cannot drop from the magnet (in case of over-crimped vials, this may happen due to the convexity of the cap).
MN now has now expanded the product line of their screw neck vials N 18 for headspace analysis by an amber 10 mL version (MN REF 702866.2) and a 20 mL one with writing patch (MN REF 702826.0). We offer open top as well as closed top magnetic screw closures N 18 with a broad variety of septa materials. Please note that all these screw neck vial N 18 cannot be used in combination with PP screw closure 702115 or any other plastic screw closures with 18-400 thread design.
An overview of suitable GC consumables for the CTC autosampler and identically constructed devices from other instrument manufacturers, such as Shimadzu, Agilent, PerkinElmer, Gerstel etc. can be found here.
