Zhongkehuifen Liner Tube Series for GC Inlets
| Brand | Zhongkehuifen |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Authorized Distributor |
| Product Origin | Domestic (China) |
| Model Series | Liner Tube Series |
| Pricing | Available Upon Request |
Overview
The Zhongkehuifen Liner Tube Series is a comprehensive portfolio of precision-engineered inlet liners designed exclusively for gas chromatography (GC) systems. These liners serve as critical interface components between the sample introduction system and the analytical column, directly influencing injection efficiency, peak shape, reproducibility, and method robustness. Constructed from high-purity fused silica or deactived quartz glass—depending on the specific variant—the liners are thermally stable up to 400 °C and chemically inert toward a broad spectrum of volatile and semi-volatile analytes. Each liner is manufactured under controlled cleanroom conditions to minimize surface activity, ensuring low bleed, minimal adsorption, and consistent vaporization behavior across repeated injections. The series supports multiple GC inlet configurations including split, splitless, on-column, and programmable temperature vaporizer (PTV) inlets, enabling method flexibility across environmental, pharmaceutical, food safety, and petrochemical applications.
Key Features
- Surface-deactivated inner walls via silanization or proprietary coating technologies to suppress active site interactions with polar or labile compounds
- Controlled internal geometry—including tapered, straight, baffled, and gooseneck designs—to optimize sample transfer, reduce discrimination, and enhance quantitative accuracy
- Consistent dimensional tolerances (±5 µm OD/ID) verified by optical metrology, ensuring reliable sealing and alignment with septum nut assemblies and ferrules
- Batch-certified traceability with individual lot numbers, supporting GLP-compliant documentation and audit-ready quality records
- Compatible with major GC platforms including Agilent, Thermo Fisher Scientific, Shimadzu, PerkinElmer, and Waters systems without adapter modification
Sample Compatibility & Compliance
The Liner Tube Series accommodates liquid, gaseous, and solid-phase microextraction (SPME) samples across concentration ranges typical of EPA Method 8260/8270, USP , and ISO 17025-accredited laboratories. Liners are tested for extractables per ICH Q5C guidelines and demonstrate <0.5 ng total organic extractables per liner when conditioned at 325 °C for 30 minutes. All variants comply with RoHS Directive 2011/65/EU and are supplied with Declaration of Conformity (DoC) documentation. For regulated environments, liners support 21 CFR Part 11–compliant electronic record retention when used within validated instrument control software workflows.
Software & Data Management
While the liners themselves are passive hardware components, Zhongkehuifen provides a digital Liner Selection Guide accessible via secure customer portal. This interactive tool recommends optimal liner types based on analyte polarity, matrix complexity, injection volume, and inlet mode—cross-referenced against validated methods published in ASTM D7217 (Standard Practice for GC Liner Selection) and ISO/IEC 17025:2017 Clause 7.2.2. Instrument method files generated using supported GC data systems (e.g., OpenLab CDS, Chromeleon, GCMSsolution) may embed liner lot identifiers for full traceability during audit preparation. Calibration and maintenance logs—including liner replacement timestamps and observed performance deviations—can be exported in CSV or PDF format for integration into LIMS or QMS platforms.
Applications
- Residual solvent analysis in pharmaceutical APIs per ICH Q3C guidelines
- Volatile organic compound (VOC) profiling in ambient air and indoor air samples (EPA TO-17)
- Fatty acid methyl ester (FAME) quantification in biodiesel per ASTM D6751
- Pesticide residue screening in fruits and vegetables (EN 15662:2018)
- Off-gas analysis from polymer packaging materials (ISO 11843-7)
FAQ
How often should GC inlet liners be replaced?
Replacement frequency depends on sample cleanliness and injection volume. In routine QC labs analyzing filtered, low-matrix samples, liners typically last 100–200 injections. For dirty matrices (e.g., soil extracts, crude oil), replacement every 25–50 injections is recommended. Visual inspection for discoloration, carbon buildup, or etching is advised prior to each sequence.
Can these liners be cleaned and reused?
Routine solvent rinsing (e.g., acetone, methanol) followed by thermal conditioning is acceptable for non-critical applications. However, Zhongkehuifen does not recommend reuse in regulated environments due to irreversible surface degradation and compromised deactivation integrity after thermal cycling.
Are custom geometries or coatings available?
Yes—OEM and method-specific liner configurations (e.g., ultra-low-volume PTV liners, graphite-ferrule-compatible designs, or phosphoric acid-resistant coatings) are available under NDA upon technical consultation and minimum order quantity agreement.
