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.

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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.

Are these caps compatible with all standard EPA vials?

Yes, these are standard 24-400 thread finishes. They perfectly fit 20ml, 40ml, and 60ml vials used in VOC and TOC analysis across all major laboratory brands.

What is the temperature tolerance for the PTFE/Silicone septa?

Our septa can withstand temperatures from -40°C to 200°C, making them suitable for both cryogenic storage and high-temperature incubation.

Can I use these with highly acidic samples?

Absolutely. The PTFE lining provides an inert barrier that resists most acids, alkalis, and organic solvents, protecting the cap material from corrosion.

Can these PP caps be autoclaved?

Polypropylene caps are generally autoclavable at 121°C; however, we recommend testing for specific dimensional stability requirements.

Difference between Nature and Bonded septa?

These are non-bonded liners for easy replacement. Bonded versions are available for applications requiring zero liner fallout.

Feb

Packing and Delivery

Packing

Each vial is individually protected in shrink-wrapped trays, 100–200 pcs per inner box, then packed into corrugated export cartons.

Labeling

Each carton includes lot number and product information for traceability.

Delivery Time

Normally 7–15 working days after order confirmation.

Shipping Options

Air freight, sea freight, or express (DHL/UPS/FedEx) available upon request.

Storage Condition

Store in a clean, dry environment at room temperature.

Company Profile

Zhejiang Aijiren Technology Co., Ltd.

A dedicated original manufacturer of chromatography and laboratory consumables.

10,000+ m² modern facility with Class 100,000 cleanrooms
Automated production lines and rigorous in-house quality control
High-volume capacity, fast lead times, and reliable global supply
OEM/ODM customization with full batch traceability
Trusted by laboratories and analytical instrument brands worldwide

VR Showroom

OEM/ODM Custom Laboratory Consumables

Aijiren turns your customized requirements—size, material, color, logo, or packaging—into reliable, ready-to-use products.

OEM/ODM

Precise manufacturing based on your drawings and specifications, with one-stop development support

Confidentiality

Full protection of all commercial information, molds, and designs

Stable Supply

Automated production ensures consistent quality and fast lead time

Technical Support

Dedicated team ensures smooth communication and hassle-free delivery

FAQ From Customers (VR Display)

What certificates do you have?

Aijiren is certified to ISO 9001:2015 by SGS, ensuring controlled manufacturing processes and stable, fully traceable product quality.

With continuous investment in R&D and multiple independent patents, we deliver high-performance and reliable consumables to laboratories worldwide.

Some of the certificates of Aijiren are displayed

What’s the MOQ? Do you accept small orders?

Aijiren supports both standard and small batch orders. While MOQ varies by product type, we are happy to accommodate smaller quantities for trial, testing, or special projects. Please contact us for specific requirements. aijiren Quality control

Is the quality guaranteed?

All Aijiren products undergo random sampling and multiple in-house quality tests. Each batch is fully traceable, ensuring stable and reliable performance for your laboratory work.

What kind of after-sales support does Aijiren provide?

Aijiren provides practical after-sales support:

● Returns & replacements: Any product affecting use or sales can be returned or replaced.

● Technical support: Assistance with product use and troubleshooting.

● Order tracking & follow-up: We monitor shipments and follow up to ensure timely delivery.

● Dedicated contact: Aijiren provides a direct contact for after-sales inquiries.

This ensures your laboratory work runs smoothly with minimal disruption.

How long will it take for orders?

The delivery time depends on the order quantity and whether customization is required:

In-stock products: shipped within 3–7 days after payment
Standard bulk orders: shipped within 2–4 weeks
OEM/ODM customized products: shipped within 3–5 weeks (depending on mold, logo, color, packaging, etc.)
Aijiren has automated production lines and a 100,000-class cleanroom, ensuring stable lead times and reliable supply.