18mm Magnetic Precision Screw Caps & Septa Supplier

Description

Feature

Specification

Application

Product

FAQ

Packing and Delivery

Product Overview

The septa are the heart of your analytical integrity. Our 17.5mm septa utilize high-purity, MS-certified silicone bonded to a chemically resistant PTFE liner without adhesives. This ensures a stable, inert barrier that prevents sample degradation and solvent interaction.

Through a specialized thermal conditioning process, we remove siloxanes that cause "ghost peaks" and baseline noise. Whether you use our standard PTFE/Silicone or our specialized SPME soft-entry septa, you are guaranteed a contamination-free seal for sensitive GC/MS detectors.

Product Features

Precision engineered for flawless autosampler performance.

Robotic Optimized: Strong magnetic properties for reliable transport by CTC PAL systems.

Ultra-Low Bleed: High-grade silicone septa minimize background interference.

Chemical Resistance: PTFE liners provide an inert barrier against aggressive solvents.

Temperature Stability: Maintains seal integrity during high-temp headspace heating.

Pre-assembled Convenience: Caps and septa arrive ready to use, saving lab time.

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ND18 Technical Specs & Ordering

Detailed Ordering & Specs

Septa Technical Performance

System Integration

Part No.	Septa Material	Thickness	Hardness (Shore A)	Features	Pcs/Pack
SACA001	Blue PTFE / White Silicone	1.5mm	45°	Standard bleed, High resealing	100
SACA002-II	Red PTFE / White Silicone	1.3mm	45°	Thinner for easier penetration	100
SACA003-II	White PTFE / Blue Silicone	1.3mm	35° (Soft)	Optimized for SPME Fibers	100
SACA004	Gray PTFE / Red Butyl	1.6mm	55°	High chemical resistance	100
SACA001002	Blue PTFE / White Silicone	1.5mm	45°	Closed-top for storage	100

Septa Material	Temp. Range	Resealing	Chemical Compatibility	Best For
PTFE / Silicone	-60°C to 200°C	Excellent	High purity, Alcohols, Ethers	GC/MS, Trace Analysis
PTFE / Butyl	-40°C to 120°C	Good	Acids, Bases, Low VOCs	Routine GC, Industrial
SPME Silicone	-60°C to 200°C	Superior	Specialized for SPME needle	Solid Phase Microextraction

Autosampler System	Drive Method	Required Feature	Compatibility	Operational Benefit
CTC PAL (RTC, RSI)	Robotic Arm	High Magnetic Flux	100%	Stable pick-up & high-speed move
Agilent (7697A/G1888)	Tray / Carousel	Precision Threading	100%	Prevents carousel jamming
Shimadzu (HS-20/10)	Mechanical Gripper	Precise Outer Dia.	100%	Airtight sampling, no leakages
Gerstel MPS	Multi-Tool	Magnetic Steel	100%	Reliable tool-change transitions

Application

For a wide range of analytical problems, our ND18 magnetic screw system is the best solution. These caps are flexible and dependable enough for current high-throughput labs to use for everything from important pharmaceutical purity tests to complicated environmental VOC monitoring. Find out how our unique septa solutions can make your chromatographic operations operate better for you.

Standard Headspace GC Analysis

Reliable sealing for routine gas chromatography and residual solvent testing.

SPME Specialized Application

Ultra-soft septa (SACA003-II) designed to protect fragile SPME fibers and needles.

Environmental VOC Monitoring

Low-bleed PTFE/Silicone septa ensure high sensitivity for volatile organic compound analysis.

Food & Fragrance Testing

Excellent chemical inertness for capturing delicate aroma profiles without contamination.

Sample Storage (Closed-top)

Closed-top magnetic caps (SACA001002) prevent sample evaporation during long-term storage.

ND18 Technical Advantages

Our ND18 system redefines precision in chromatography. By combining metallurgical excellence with polymer purity, we provide a sealing solution that withstands the rigors of modern high-throughput laboratories.