Optimize your laboratory workflow with these premium 8mm 8-425 screw caps and septa. Engineered specifically for autosampler vials, this closure system ensures maximum sealing integrity and chemical resistance, protecting your valuable samples from contamination and evaporation.
Double-Layer Septa Technology: Features a PTFE protective layer facing the chemical sample for superior chemical resistance, bonded with a flexible silicone layer that provides excellent resealing properties after needle penetration.
Designed for Autosamplers: The 5.5mm open-top (centre hole) allows smooth, effortless needle penetration from autosamplers without tearing the septa or damaging the needle.
Standard 8-425 Thread: Provides a perfect leak-proof seal specifically for all standard 8-425 screw top chromatography vials (not compatible with 9mm vials).
Premium Materials: Durable polypropylene (PP) caps paired with high-purity septa to prevent sample leaching or background interference during analysis.
| Parameter | Specification |
| Product Type | Screw Cap with Septa |
| Thread Size / Neck Finish | 8-425 / 8mm Screw Thread |
| Cap Color | Black |
| Cap Material | High-Quality Polypropylene (PP Plastic) |
| Top Type | Open top with 5.5mm Centre Hole |
| Septa Material | Nature PTFE / White Silicone |
| Septa Size | 8mm x 1.5mm |
| Application | For Chromatography / Laboratory Use Only |
These caps are widely used in analytical chemistry, research, quality control, and testing laboratories. They are ideal for:
HPLC (High-Performance Liquid Chromatography) autosamplers.
GC (Gas Chromatography) sample preparation.
Secure storage of volatile samples and organic solvents.
Choose the quantity that fits your lab's demands:
300 pcs
500 pcs
1000 pcs
Note on Compatibility: These caps are designed only for 8-425 screw top vials. Please verify your vial thread size before purchasing. Does not fit 9mm vials.
Package Contents: This listing is for caps and septa only. Vials are sold separately unless purchased as part of a bundle.
Usage Disclaimer: For laboratory, research, and scientific use only. Not for medical, injection, or hypodermic applications.