24-400 EPA Vial Screw Caps & 22mm Septa

Description

Feature

Specification

Application

Product

FAQ

Packing and Delivery

Introduction

We utilize pharmaceutical-grade Polypropylene for our caps and high-purity PTFE/Silicone for the septa. This combination ensures that even under long-term storage or aggressive solvent exposure, there is zero risk of sample contamination or liner degradation.

Each 24-400 thread is molded to exact tolerances to ensure a smooth, secure fit. The 3mm thick septa is designed to withstand multiple needle punctures while maintaining its resealability, protecting the vacuum integrity of your volatile organic samples.

Technical Excellence

Engineered for perfect compatibility with 40ml EPA/VOC storage vials.

Ultra-Pure Materials: We use virgin PP and medical-grade silicone to eliminate ghost peaks in chromatography.

Standardized Thread: The 24-400 thread design ensures a tight seal without the risk of over-tightening or cap cracking.

Thermal Stability: Septa maintain elasticity and sealing integrity even under temperature fluctuations.

Center Hole Precision: 15mm openings are optimized for automatic sampler needles, preventing needle bending.

Chemical Barrier: PTFE lining provides a robust barrier against aggressive solvents and acidic samples.

Related products

24-400 EPA screw neck vials for laboratory sample storage

24-400 EPA Vials for Sample Storage

Technical Catalog & Configuration Guide

22mm Individual Septa

24-400 Polypropylene Screw Caps

Pre-Assembled Sealing Kits

Part No.	Septa Material	Feature	Pcs/Pack
S221-I	Nature PTFE / Nature Silicone	Ultra-Pure	100
S223	Gray PTFE / Red Rubber / Gray PTFE	Economical	100

Part No.	Cap Color	Type	Hole Size
C221/223/225	White / Black / Red	Open-top	15mm Centre Hole
C222/224	White / Black	Closed-top	N/A

Part No.	Cap Style	Septa Type	Application
SC221221	White Open Top	Nature PTFE/Silicone	Autosampler VOC Test
SC221222	White Closed Top	Nature PTFE/Silicone	Field Sampling
SC221224	Black Closed Top	Nature PTFE/Silicone	Light-sensitive Storage

Application Scenarios

Our 24-400 closure systems are engineered for uncompromising seal integrity across diverse analytical sectors, meeting the stringent requirements of EPA and ISO protocols.

Environmental Water Analysis

Optimized for VOC and TOC testing in drinking water and industrial effluent, ensuring zero volatile analyte loss

Soil & Sediment Testing

Robust sealing for headspace analysis of volatile organic compounds in solid environmental samples.

Pharmaceutical Stability

Chemically inert PTFE liners protect sensitive drug intermediates and active ingredients from contamination.

Petrochemical Sampling

Resistant to aggressive solvents and hydrocarbon-based samples, maintaining seal under pressure.

Food & Flavor Research

Low-bleed septa ensure that no plasticizers interfere with delicate aroma and flavor profiles during GC-MS.

Critical Knowledge for Lab Sealing Solutions

Our 24-400 closures are compatible with all major 40ml EPA vial brands. Engineered for VOC soil and water analysis, we guarantee strict lot-to-lot consistency to safeguard your analytical integrity and SOP stability.