The EFST90W precision filter element is a high-performance filtration component designed as a direct replacement for the SMC EF Series precision filters. It is specifically engineered for critical compressed air systems where the removal of oil mist, water aerosols, and fine particulate contamination is essential for equipment reliability and product quality.
Constructed with high-quality filter media, the EFST90W precison filter delivers consistent filtration efficiency across a wide range of operating conditions. This filter is available in multiple micron ratings, allowing users to select the appropriate filtration precision for their specific application—from general industrial instrument air to ultra-clean air for sensitive processes. The reinforced design, featuring an anti-corrosion skeleton and high-strength end caps, ensures the element maintains its structural integrity even under challenging operating conditions, including high humidity, temperature fluctuations, and moderate pressure surges.
| Part number | EFST90W |
| Filter layer | Customized |
| End caps | Nylon |
| Working temperature | -20~+100℃ |
| Filtration rating | 1μm, 3μm, 5μm, 7μm, 10μm (custom ratings available) |
| Package | Neutral carton package |
| Manufacturer | Huahang Filter |
This is the specification of the standard part number. We can also provide customized service. If you have needs, please contact us.
Huahang Filter is a globally recognized manufacturer and supplier of high-performance filtration solutions. Unlike distributors who simply resell stock products, Huahang is a true manufacturing powerhouse with full control over design, material selection, production, and quality assurance. Our mission is to deliver precision-engineered filtration products at factory-direct prices.
20+ Years of Industry Expertise: We’ve spent over two decades specializing in hydraulic and industrial filtration. Our engineering team averages 20 years of experience, understanding the critical requirements of precision filtration across diverse applications.
True Manufacturer with Full Process Control – Huahang controls media sourcing, assembly, and final testing in‑house, eliminating the variability that comes with third‑party supply chains. This vertical integration ensures consistent product quality, full material traceability, and the ability to customize critical parameters without depending on external suppliers.
Built to Last, Priced for Reality: Through vertical integration and lean manufacturing, we deliver filters that meet premium quality standards at prices that make sense for industrial budgets. We use premium glass fiber media and heavy-gauge steel components because cutting corners on filtration always costs more in the long run.
Factory‑Direct Support: Customers receive direct manufacturer support from Huahang‘s engineering team, not through intermediaries. This means faster cross‑reference verification, quicker responses, and access to first‑hand product data for specification and troubleshooting purposes.
Quality Assurance: ISO 9001 certified manufacturing processes ensure consistent, reliable performance across all products.
The EFST90W Precision Filter Element is suitable for a wide range of compressed air and industrial gas applications where removal of oil mist, water aerosols, and fine particulate contamination is required. It is typically installed as a final polishing filter or as part of a multi-stage filtration cascade:
Compressed Air Systems – General industrial compressed air purification for pneumatic tools, cylinders, valves, and actuators. The EFST90W removes oil carryover from lubricated compressors, protecting downstream equipment from contamination-induced wear and seizing.
Pharmaceutical Manufacturing – Cleanroom compressed air and gas systems requiring high-purity, oil-free air for tablet coating, fermentation, packaging, and cleanroom ventilation. The fine micron ratings (1μm or finer) meet the stringent air quality standards required for GMP compliance.
Electronics and Semiconductor Manufacturing – High-purity compressed air for wafer handling, printed circuit board assembly, and cleanroom environments, where even trace oil or particle contamination can cause product defects and yield loss.
Automotive Manufacturing – Paint spray booths (preventing oil mist from causing paint defects), assembly line pneumatics, robotic systems, and pneumatic testing stations.
Plastics and Polymer Processing – Blow molding, injection molding, part ejection, and pneumatic conveying, where oil contamination can cause surface defects and adhesion problems in finished parts.
Q: Is this a genuine OEM filter?
A: This is a high-performance direct replacement element manufactured by Huahang Filter. It is engineered to provide equivalent fit, filtration efficiency, and performance to the original EFST90W part. The part number is for reference and identification purposes only.
Q: How do I confirm this filter will fit my specific housing?
A: Verify that the part number EFST90W is listed in your equipment manual or on the currently installed filter. Also check critical dimensions (OD, length, seal type) if possible. Our technical team can cross-reference with a drawing or sample.
Q: What is the micron rating of this precision element?
A: The exact micron rating depends on the original OEM specification. Typical precision elements in this series range from 1 to 10 microns absolute or nominal. For specific technical data, please consult the manufacturer’s datasheet or contact our support team.
Q: What is the recommended service interval?
A: Replacement intervals depend on system operating conditions, fluid type, and contamination levels. Always follow the equipment manufacturer’s recommended schedule. The most accurate method is to monitor the pressure differential across the filter housing – replace when delta-P reaches the specified limit.
Q: How do I store spare precision filter elements?
A: Store in a cool, dry environment away from direct sunlight, extreme temperatures, and chemical fumes. Keep in original packaging until ready for installation to prevent pre-contamination.
