20mm Aluminum Crimp Caps & Septa Supplier

Description

Feature

Specification

Application

Product

FAQ

Packing and Delivery

The Gold Standard for Secure Headspace Sealing

The 20mm crimp-top system is the best in the business for volatile analysis and provides the best sealing for Headspace GC. Our aluminium caps make sure that the seal is even all the way around, so that samples don't get lost during high-temperature incubation. They fit perfectly with the vial rim.

Specialised Magnetic and Safety Options: Our magnetic caps make sure that robotic systems like CTC PAL can be moved safely. Our Pressure Release Caps work like safety valves. They open at 3.0 ± 0.5 bar to keep vials from breaking when they get too hot.

Advanced Engineering for Robotic & Manual Systems

Engineered for chemical resistance and robotic precision.

Robotic Optimized: Magnetic versions ensure zero-drop transport in CTC PAL and Gerstel systems.

Ultra-Pure Septa: Thermal conditioning removes siloxanes, ensuring clean baselines in GC/MS.

Pressure Safety: Pressure-release bridges prevent accidental vial explosions during over-heating.

Chemical Inertness: High-grade PTFE liners provide a robust barrier against aggressive solvents.

Karl Fischer Fit: Specialized 10mm hole caps designed for seamless needle entry in KF titrators.

Related products

20mm Crimp Top Headspace Vials

18mm Magnetic Screw Caps with Septa

18mm Precision Screw Thread Headspace Vials for GC

18mm Screw Thread Headspace Vials

Technical Support & Selection

Septa Selection & Chemical Resistance

Cap Type & Autosampler Compatibility

Application Troubleshooting

Septa Material	Temp Range	Shore A Hardness	Chemical Compatibility	Recommended For
PTFE / Silicone	-60°C to 200°C	45° - 50°	High resistance to most acids and alcohols	Routine GC Headspace / VOCs
Pharma-Fix (PTFE/Sil)	-60°C to 200°C	50° - 55°	Best for trace analysis, lowest bleed	High-Sensitivity GC/MS Analysis
PTFE / Butyl	-40°C to 120°C	55°	Excellent gas barrier, prevents evaporation	Long-term Sample Storage / Pharma
Moulded Butyl	-40°C to 120°C	60°	High seal integrity, budget-friendly	General Gas Sampling / Low Pressure

Cap Type	Material	Center Hole	Robotic Pickup	Compatible Instruments
Standard Aluminum	High-Grade Alum.	9.5mm	No (Manual)	Agilent 7694, Waters Headspace
Magnetic (Blue/Red)	Steel Insert	8.0mm	Yes (High Flux)	CTC PAL, Gerstel, Shimadzu AOC
Pressure Release	Alum. w/ Bridge	9.5mm	No (Manual)	High-Pressure/High-Temp Incubation
Karl Fischer Spec.	High-Grade Alum.	10.0mm	No (Manual)	Metrohm, Mettler Toledo (KF Vials)

Lab Problem (Pain Point)	Root Cause	Recommended Solution	Technical Advantage
"Ghost Peaks" in MS	Septa siloxane bleed	Switch to Ultra-Low Bleed Septa	Vacuum-baked conditioning removed siloxanes
Vial Bursting @ High Temp	Internal pressure > 5 bar	Use Pressure Release Caps	Caps open at 3.0±0.5 bar for safety
Needle Bending/Coring	Hole size too small	Use 10mm Center Hole Caps	Easier needle entry, reduces coring
Sample Loss/Evaporation	Poor crimp seal	Check Cap Ductility	Our Alum. alloy ensures 360° uniform seal
Robot Drop Events	Low magnetic flux	Use High-Carbon Magnetic Caps	Stronger attraction for robotic magnets

Application Scenarios

Reliable Sealing Solutions Across Critical Applications

High-Throughput Automation

Magnetic steel caps for reliable transport by CTC PAL and Agilent robotic arms.

Karl Fischer Titration

10mm center holes for easy needle entry in specialized KF titrators.

VOC & Residual Solvents

Low-bleed PTFE/Silicone septa prevent siloxane interference in trace analysis.

Safety-Critical Heating

Pressure-release caps act as a safety fuse to prevent vial bursts during incubation.

Pharma Stability Storage

Molded Butyl septa offer the lowest gas permeability for long-term preservation.

Technical Superiority

Precision Manufacturing & Stringent Quality Assurance

CNC Hole Precision

Every center hole is CNC-verified for perfect alignment with autosampler needles

Thermal Conditioning

Septa undergo vacuum-baking to eliminate outgassing in MS detectors.

Consistent Crimp Force

Optimized aluminum alloy ductility ensures a perfect seal without cracking.

Adhesive-Free Bonding

PTFE is molecularly bonded to silicone without glues, preventing contamination.

Magnetic Flux Optimization

High-carbon steel inserts provide maximum grip for robotic pickup tools

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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.