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Autosampler Vial

9mm 2ml Short Tread HPLC Autosampler Vial 9mm Short Thread Caps with Septa 8-425 2ml Screw Neck HPLC Autosampler Vial Screw Caps with Septa for 8-425 Screw Neck Vial 10-425 Screw Neck 2ml HPLC Autosampler Vial 10-425 Screw Caps with Septa 11mm Crimp Top 2ml Autosampler Vial 11mm Crimp Top Caps with Septa 11mm Snap Ring 2ml Autosampler Vial 11mm Snap Top Caps with Septa

20mm Crimp Top Aluminum Caps with Septa 18mm Screw Headspace Vial 20ml Headspace Vials Butyl Rubber Stopper for 20mm Crimp Vials 20mm Crimp Top Aluminum Caps 20mm 20ml Crimp Headspace Vial 18mm 20ml Screw Headspace Vial 20mm 10ml Crimp Top Headspace Vial 18mm 10ml Screw Headspace Vials 20mm 6ml Crimp Top Headspace Vials for Karl Fischer

EPA VOA TOC Vials

15-425 Screw Sample Storage Vial 15-425 Thread Caps with Septa 40ml TOC Vial EPA VOA Vials 24-400 Screw Neck PP Caps with Septa

Glass Sample Cell with Cap 25mm 16mm COD Digestion Test Tube Glass Test Tube with Screw Cap 13mm & 16mm

Micro Vial Insert

0.3ml 11mm Glass Crimp Vial with Fused Insert 9mm 0.3ml Glass Micro vial Integrated with Insert Micro Inserts for Hplc Vials 1ml Shell Vial 300ul Micro Insert, Flat Bottom, 100/pk 250 μL 9, 10, 11mm Conical Bottom Vial Insert, 100/pk Aijiren 250ul Vial Insert, Glass Spring Bottom for 9, 10, 11mm Vials 250ul Micro Insert, Flat Bottom for 8-425 Vials 150 μL 8mm Conical Bottom Vial Insert Vial Insert, 150ul, Glass with Polymer Feet for 8-425 Screw top Vial

Amber Reagent Bottle for Laboratory Clear Reagent Bottle for Laboratory GL45 Reagent Bottle 100ml GL45 Reagent Bottle 250ml GL45 Reagent Bottle 500ml GL45 Reagent Bottle 1000ml Clear Reagent Bottle 100ml Clear Reagent Bottle 250ml Clear Reagent Bottle 500ml Clear Reagent Bottle 1000ml

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Non-sterile Disposable Syringe Filter Syringe Filter PTFE for HPLC Syringe Filter Nylon for Laboratory Syringe Filter PVDF for Sale Sterile Syringe Filters Wholesale Syringe Filter MCE for Lab Use 0.22μm Pore Syringe Filters for Sale 25mm Syringe Filter for Sale 13mm Syringe Filters Wholesale 0.45μm Syringe Filtre Wholesale Price

Hand Crimper for 11mm, 20mm Crimp Caps Hand Decrimper for 11mm, 20mm Crimp Caps 4ml Vials Rack 2ml Vial Rack

All Consumables

Comprehensive Guide to Headspace vials:Features, Selection, Price, and Usage Comprehensive Guide to Reagent Bottle Encyclopedia of HPLC vials All About Vial Crimpers: A Detailed 13mm & 20mm Guide Comprehensive Guide to Syringe Filters: Features, Selection, Price, and Usage HPLC Vial Inserts: Enhancing Precision and Sample Integrity Premium PTFE and Silicone Septa: Reliable Sealing Solutions Wholesale COD-V50 16mm 100mm cod tube for water analysis V945 Cheap 2ml 9mm amber HPLC vials for sale V935 Wholesale 2ml amber HPLC vials from China

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Is screw cap or crimp cap of headspace vial right for you(2)?

Dec. 31st, 2019

By calculating the percentage of relative loss within 6 hours, the average compound area from T0 to T6 is compared. The relative percentage difference for each Headspace vial is shown in below.

headspace vial experiment result

As we can be seen from the picture, the 18mm 20ml screw headspace vial cap’s seal from T0 to T6 are not as good as the 20mm 20ml crimp headspace vial cap. It is also worth that in six hours screw cap and crimp cap had very little change in ISTD.

18mm screw cap

After looking at the data and taking everything into account, I think if you do Headspace analysis of highly volatile compounds (gases) in the lab, you should use crimp headspace vial. However, even with use of crimp headspace vials, we still need to be aware of the fact that lighter, more volatile compounds, can still escape the Headspace vial.

Now, having said that, I don't want to give the impression that screw caps are worthless. Screw top Headspace vial can certainly be used for Headspace analysis, especially if the compound being analyzed is less volatile, or if it takes you 3-5 minutes to prepare sample to analysis. For many customers analyzing the standard list of solvents and volatiles a screw cap may be appropriate. Please choose the suit 20ml headspace vial in your experiment.

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