Cleanroom-Grade Stainless Steel Coil Tube with Liquid Particle Counter (LPC) Certified Purity
Product Overview
The Cleanroom-Grade Stainless Steel Coil Tube produced by Wenzhou Jixing Metal Materials Co., Ltd. represents the pinnacle of ultra-clean tubing technology, engineered specifically for applications demanding the highest levels of internal surface cleanliness and particle control. Unlike conventional coil tubes, this product line incorporates a rigorous Liquid Particle Counter (LPC) verification protocol as a mandatory batch-release criterion, ensuring that every coil tube meets stringent cleanroom-grade contamination thresholds.
The Liquid Particle Counter (LPC) testing methodology employed is a non-destructive, statistically robust inspection method that provides quantitative particle characterization across three critical size classifications: ≥0.1μm, ≥0.2μm, and ≥0.5μm. This multi-tier particle counting approach enables precise identification of particulate contamination levels that directly impact the performance and longevity of downstream systems in semiconductor, pharmaceutical, biotechnology, and ultra-pure fluid handling applications.
Material & Properties
These coil tubes are manufactured from premium austenitic stainless steel grades selected for their superior corrosion resistance, chemical inertness, and compatibility with ultra-clean processing environments.
- Available Grades: 304L, 316L, 316Ti, 904L, and custom alloy compositions
- Internal Surface Finish: Electropolished to Ra ≤ 0.25μm (typical), achieving a smooth, non-reactive interior surface that minimizes particle adhesion and facilitates thorough cleaning
- Chemical Resistance: Excellent resistance to acids, alkalis, and chlorides; suitable for CIP (Clean-In-Place) and SIP (Sterilize-In-Place) protocols
- Mechanical Properties: High tensile strength with excellent ductility, enabling reliable forming and welding without compromising structural integrity
- Weldability: Superior weld performance with minimal sensitization risk, particularly in low-carbon grades (304L, 316L)
- Temperature Range: Operational from cryogenic temperatures up to 870°C (1600°F) depending on grade
Specifications
| Parameter | Specification | Notes |
|---|---|---|
| Outer Diameter (OD) | 3.00 – 32.00 mm (0.118" – 1.260") | Custom sizes available upon request |
| Wall Thickness | 0.20 – 2.00 mm (0.008" – 0.079") | Tight tolerances maintained throughout |
| OD Tolerance | ±0.02 – ±0.05 mm (±0.001" – ±0.002") | Consistent dimensional accuracy |
| Wall Thickness Tolerance | ±0.01 – ±0.03 mm (±0.0004" – ±0.0012") | Uniform wall for reliable flow characteristics |
| Internal Surface Roughness | Ra ≤ 0.25μm (typical); Ra ≤ 0.10μm (available) | Electropolished interior finish |
| Particle Count ≥0.1μm | Verified per batch via LPC | Primary contamination indicator |
| Particle Count ≥0.2μm | Verified per batch via LPC | Secondary classification threshold |
| Particle Count ≥0.5μm | Verified per batch via LPC | Critical particle size for cleanroom compliance |
| Coil Length | 5 – 100 meters (16 – 328 ft) per coil | Custom coil lengths available |
| Material Grade | 304L / 316L / 316Ti / 904L | Mill certificates provided |
| End Condition | Plain / Beveled / Formed | Custom end preparation available |
| Packaging | Protective caps + desiccant + sealed cleanroom packaging | Prevents post-manufacturing contamination |
Manufacturing Process
The production of cleanroom-grade coil tubes follows a meticulously controlled multi-stage process designed to minimize contamination at every step:
- Raw Material Selection: Virgin stainless steel strip sourced from certified mills with full traceability documentation. Incoming material undergoes spectroscopic verification (PMI) to confirm alloy composition.
- Precision Cold Forming: High-precision roll-forming equipment shapes the strip into seamless coil tube geometry with tight dimensional control. Forming occurs in a controlled environment to prevent particulate introduction.
- Seam Welding: TIG (Tungsten Inert Gas) welding or seamless drawing is employed depending on the specific OD and wall thickness requirements. Weld parameters are precisely controlled to ensure metallurgical integrity.
- Heat Treatment: Solution annealing in a protective atmosphere eliminates residual stresses and ensures uniform microstructure and optimal corrosion resistance.
- Acid Pickling: The tube is subjected to controlled acid pickling to remove oxide scale and surface contaminants, exposing a fresh, clean metal surface.
- Electropolishing: Electrochemical polishing removes the outermost surface layer, achieving the specified Ra ≤ 0.25μm internal finish. This process removes up to 10-20% of wall thickness, eliminating surface defects and embedded contaminants.
- Ultrasonic Cleaning: Tubes are cleaned in an ultrasonic bath using deionized water and approved cleaning agents to remove any residual particles or chemical residues.
- Final Rinse & Drying: A final rinse in high-purity deionized water (resistivity ≥18.2 MΩ·cm) followed by controlled drying in a cleanroom environment.
- Liquid Particle Counter (LPC) Testing: Each batch undergoes mandatory LPC testing where a known volume of ultra-pure fluid is circulated through the tube, and the effluent is analyzed for particle counts at ≥0.1μm, ≥0.2μm, and ≥0.5μm classifications.
- Batch Release: Only batches meeting all specified particle count thresholds are released for shipment. Non-conforming batches are rejected and reprocessed or scrapped.
- Protective Packaging: Approved tubes are fitted with protective end caps, sealed in cleanroom-grade packaging with desiccants to maintain cleanliness until installation.
Applications
The LPC-verified cleanliness of these coil tubes makes them indispensable in the following critical applications:
- Semiconductor Manufacturing: Ultra-pure chemical delivery systems, wafer processing lines, and CVD/PVD equipment requiring particle-free fluid transport
- Pharmaceutical & Biotechnology: Bioreactor tubing, sterile fluid transfer lines, HPLC systems, and cleanroom piping where particulate control is GMP-mandated
- Food & Beverage Processing: High-purity water systems, CIP/SIP loops, and sterile product transfer lines
- Medical Devices: Implantable device manufacturing, dialysis systems, and hospital-grade fluid handling equipment
- Optical & Photonics: Laser cooling systems, optical fluidics, and high-purity coolant circuits
- Chemical & Petrochemical: Ultra-pure solvent delivery, catalyst transport, and sensitive chemical processing
- Heat Exchangers & Cooling Systems: High-efficiency heat transfer applications where internal cleanliness directly impacts thermal performance and longevity
Quality Certifications & Testing Protocols
Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management system that underpins every aspect of production:
- ISO 9001:2015 – Quality Management System certification ensuring consistent product quality and customer satisfaction
- ISO 14644 Compliance – Manufacturing and testing conducted in accordance with cleanroom classification standards
- Material Certificates (EN 10204 3.1/3.2) – Full mill traceability and chemical/mechanical property verification for every batch
- Liquid Particle Counter (LPC) Testing – Mandatory batch-release inspection using calibrated LPC instruments with traceable calibration standards
- Particle Counting Standards: Testing conducted per ISO 21501-4 and relevant industry specifications for liquid particle counting
- Surface Roughness Verification – Confocal microscopy or profilometry verification of internal surface finish (Ra values)
- Chromatography Analysis – Optional organic contamination testing to verify absence of hydrocarbon residues
- Visual Inspection – Borescope inspection of internal surfaces for weld quality, surface defects, and visual cleanliness
- Dimensional Inspection – 100% or statistical sampling of OD, wall thickness, and straightness per customer requirements
Unique Selling Point: The integration of Liquid Particle Counter (LPC) testing as a mandatory batch-release criterion — with graded particle counting at ≥0.1μm, ≥0.2μm, and ≥0.5μm — distinguishes these coil tubes as truly cleanroom-grade products. This provides customers with quantitative, objective evidence of internal cleanliness that exceeds conventional visual or weight-loss inspection methods, enabling confident qualification for the most demanding contamination-sensitive applications.
Why Choose Wenzhou Jixing Metal Materials Co., Ltd.
- Quantified Cleanliness Assurance: Every batch ships with documented LPC test results, providing measurable proof of particle cleanliness rather than subjective assessment
- Multi-Tier Particle Classification: The three-level counting (≥0.1μm, ≥0.2μm, ≥0.5μm) provides granular insight into contamination profiles, enabling customers to correlate particle data with their specific process requirements
- Full Traceability: From raw material mill certification through final LPC testing, complete documentation is provided for each batch
- Custom Engineering Support: Flexible specifications for OD, wall thickness, grade, coil length, and end preparation to meet unique application demands
- Cleanroom-Grade Packaging: Post-manufacturing contamination prevention through sealed, desiccant-protected packaging
- Technical Partnership: Dedicated engineering support for application qualification, system integration, and contamination control strategy