Autosampler Vial and Closure Selection Guide

Match Vial Neck Type To Your Autosampler

The 8-425 and 9-425 neck types are standard for HPLC and GC autosamplers from Agilent, Shimadzu, and Waters. Using the wrong neck size causes misalignment, needle mispierce, or sample loss. 8-425 fits most standard 8 mm neck systems; 9-425 is for 9 mm systems. Confirm your instrument's neck specification before ordering.

Glass Vials Resist Extractables And Thermal Stress

Borosilicate glass vials (9-425) offer high chemical resistance and low extractables, making them suitable for volatile solvents and trace analysis. Clear glass is standard for most applications; amber glass protects light-sensitive analytes. Both have flat bottoms for stable placement in autosampler inserts.

PP Vials For Low-Cost, Single-Use Applications

They are available in 0.3, 0.7, and 2 ml volumes with graduated markings. PP vials are not recommended for aggressive solvents or high-temperature runs due to potential leaching.

Septum Material Affects Needle Penetration And Sample Integrity

PTFE/Silicone septa are standard for HPLC due to low extractables and good needle penetration. Red PTFE/white silicone offers higher durability. Pre-slit septa reduce needle wear and improve piercing consistency. White PTFE septa (0.25 mm) are for low-volume, high-purity applications where minimal septum material enters the sample.

Cap Design Controls Seal Integrity And Handling Risk

Black PP caps provide a secure seal for glass vials. Magnetic caps are used in high-throughput systems for faster placement. Pre-assembled caps and septa reduce handling and contamination risk. Avoid loose components when working with trace-level samples.

Volume And Size Constraints For Sample Loading

All vials are 12*32 mm in size. The 2 ml volume is standard for most injections. Smaller volumes (0.3, 0.7 ml) are available in PP for limited sample applications. The 8-425 and 9-425 vials are designed to fit standard autosampler inserts and maintain consistent positioning.

Pre-Assembled Kits Reduce Contamination And Setup Time

Pre-assembled caps and septa minimize handling and reduce the risk of particulate or chemical contamination. This is critical in trace analysis where even small amounts of foreign material can affect HPLC baselines or GC peaks.