Buy 11mm Crimp Aluminum Caps & PTFE/Silicone Septa

Sealing Engineering & Mechanical Integrity

The 11mm crimp system is the preferred choice for volatile sample analysis because it creates a permanent physical barrier. Unlike screw caps that rely on torque, the aluminum seal uses a mechanical crimp to distribute 360-degree pressure, compressing the septa uniformly against the vial rim to eliminate evaporation paths .

Constructed from 0.25mm thick high-purity aluminum, our caps offer the necessary ductility for a hermetic seal without the risk of splitting under the force of a crimper. The 5.5mm center hole is precision-beveled to maximize the target area for autosampler needles while preventing septa displacement during high-pressure injections .

Material Science & Chemical Inertness

The septum is the only component in direct contact with your sample. Our PTFE/Silicone septa utilize advanced lamination technology to permanently bond a micro-thin PTFE film to a high-elasticity silicone engine.

Polytetrafluoroethylene (PTFE) provides a nearly universal chemical barrier, resisting aggressive acids, bases, alcohols, and organic solvents . Its stable carbon-fluorine molecular structure prevents solvent-induced degradation of the silicone matrix, ensuring no plasticizers or monomers leach into the sample.

The internal high-purity silicone layer offers exceptional resealing capabilities. Upon needle withdrawal, the silicone’s molecular memory quickly closes the puncture site, preventing air ingress or sample evaporation—vital for sequence analysis involving multiple injections .

For ultra-trace analysis (LC-MS/MS), our S113 Red PTFE/White Silicone/Red PTFE (TST) septa provide a dual-barrier system. The back-side PTFE layer locks in potential siloxane bleed, making it the cleanest sealing option for sensitive mass spectrometry workflows.

The S1111 and S1122 pre-slit septa are engineered for delicate, thin-gauge needles. By utilizing a "Y" or cross-slit design, the required penetration force is reduced by over 60%. This extends needle life and prevents the formation of a vacuum inside the vial during large-volume sample withdrawal .

These septa maintain physical integrity across a wide temperature spectrum from -60℃ to 210℃. They are equally stable in liquid nitrogen storage and high-temperature headspace heating environments .

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Product Matrix Selection Tables

Septa Material & Application Matrix

Aluminum Cap Color Management

Workflow Efficiency Kits

Part No.	Septa Configuration	Best Use Case	Chemical Resistance
S111	White PTFE/Red Silicone	Routine HPLC/GC Analysis	High (Standard)
S112	Red PTFE/White Silicone	High-sensitivity GC-FID	Ultra-High
S113	Red PTFE/Silicone/Red PTFE	Ultratrace Analysis (LC-MS/MS)	Maximum (TST)
S115	Nature PTFE/Red Rubber	Economical Routine QC	Moderate

Part No.	Cap Color	Purpose in GLP	Material Type
C111	Silver (Standard)	General Inventory & Large Batches	Anodized Aluminum
SC112112	Red	Urgent Samples / Hazard Identification	Anodized Aluminum
SC112113	Blue	Calibrators / Blanks Identification	Anodized Aluminum
SC112114	Gold	Specified Control Samples	Anodized Aluminum

Part No.	Configuration	Efficiency Benefit	Target System
S1111	Pre-slit Septa Only	Prevents Vacuum, Protects Needles	High-Throughput
SC111111	Pre-assembled (Cap+Septa)	Eliminates Lab Handling Contamination	Certified Robotics
SC1111111	Pre-assembled + Pre-slit	Maximum Convenience & Safety	MS/MS Systems

Performance Validation & Empirical Data

Simulated 2025 laboratory stressors demonstrate that our 11mm crimp system outperforms generic alternatives across several key metrics

Leak-Proof Excellence

Pressure decay tests confirm that after $50$ injections, vial pressure retention remains above $95\%$. The rapid self-healing of our high-density silicone ensures that volatile solvents like acetonitrile show negligible concentration shifts over 48-hour sequences.12

Zero-Coring Puncture Technology

By optimizing the PTFE film’s molecular cross-linking, our septa exhibit high toughness. This prevents rubber fragments (coring) from entering the sample and clogging expensive capillary columns, a critical factor in proteomics and environmental water analysis .

Precise Needle Guidance

The 5.5mm aperture provides a physical guide, ensuring the needle always strikes the geometric center of the septum. This precision significantly reduces the incidence of needle bending during high-speed automated transfers .

Advanced Color-Coded Management

Available in silver, red, blue, and gold, our color-coded caps facilitate modern Good Laboratory Practice (GLP). Technicians can visually distinguish between standards, blanks, and high-risk samples at a glance

Ultra-Low Extractable Background

In GC-MS and LC-MS total ion chromatograms (TIC), our septa demonstrate virtually zero siloxane leaching. This high purity level allows for clear peak identification in complex qualitative analysis, effectively eliminating the risk of false positives caused by consumable contamination