Chemical engineers routinely face 0.1 micron particulate challenges in high-purity process streams operating at 2.5 bar differential pressure and 45 m³/h flow rates. These conditions demand consistent metallurgical integrity, gasket compatibility with aggressive solvents, and emission control verified against ISO. Our Ultra-High-Purity Stainless Steel range addresses this intersection directly — not as a catalog of options, but as an integrated system where housing geometry, membrane chemistry, and mesh specification are co-validated for chemical stability and fugitive emission performance.
Material Consistency Across the System
316L stainless steel is specified across all structural components: housings, cages, tubing, and mesh consumables. This eliminates galvanic coupling risks during extended exposure to chlorinated hydrocarbons or oxidizing acids. Unlike mixed-material assemblies, our unified alloy approach maintains passive film continuity even under thermal cycling between −20 °C and 150 °C. In practice, we typically observe no measurable chloride-induced pitting after 1,200 hours in 10% sodium hypochlorite at pH 11.5 when surface finish remains Ra ≤ 0.4 µm.
Membrane Cartridge Selection Criteria
Selection hinges on solvent polarity, particle morphology, and required retention. The Ultra High Purity 2.5 inch PES membrane filter cartridges suit aqueous and polar organic systems requiring low protein binding. Nylon variants offer broader chemical compatibility but exhibit higher extractables in strong bases. The 2.7 x 30 inch Ultra High Purity 0.1 micron PES membrane filter cartridge with DOE flat gasket end cap and Viton gasket (GFPES0_1A30C2V) delivers validated retention for submicron catalyst fines in hydrogenation loops.
Structural Housing Performance
The 10 and 20 inch Type 316L SS single cartridge sanitary housing with T style Tri-Clamp pipe fittings supports full ASME BPE alignment and repeatable torque application. Its internal weld profile minimizes crevice volume while maintaining pressure containment up to 10 bar. The SS316L and SS304 precision filter housing cartridge accommodates both standard and custom-length elements without compromising seal geometry. For flue-gas scrubber recirculation lines, the SIIC stainless steel bag filter provides mechanical stability where pulsating flow exceeds 3 Hz.
| Product | Max Operating Temp (°C) | Compatible With | Emission Compliance |
|---|---|---|---|
| Ultra High Purity 2.5 inch PES | 85 | Aqueous, alcohols, acetone | ISO Class A |
| Ultra High Purity 2.5 inch Nylon | 121 | Hydrocarbons, ethers, halogenated solvents | ISO Class B |
| GFPES0_1A30C2V cartridge | 85 | Oxidizers, amine solutions, H₂O₂ blends | ISO Class A |
| SS316 wire mesh filter bags | 450 | Dry powders, molten polymers | Not applicable |
This table shows clear operational boundaries.
Filtration Media Trade-offs
A key trade-off exists between absolute retention and flow capacity: reducing pore size from 0.22 micron to 0.1 micron sacrifices 35% nominal throughput at equivalent ΔP. That sacrifice is necessary only where catalytic metal leaching or microbial ingress must be excluded. Mesh-based filtration avoids that trade-off entirely but does not apply to colloidal suspensions below 5 micron. Chemical engineers should not select mesh media for emulsified systems — its limits are mechanical, not chemical.
- SS316L sanitary tubing selection enables seamless integration with existing BPE-compliant skids
- 108 inch and 144 inch SS316 filter cages provide axial rigidity for high-velocity liquid service
- All Ultra-High-Purity Stainless Steel products undergo passivation per ASTM A967 Nitric Acid Method
For applications involving flammable vapors or dust clouds, ATEX compliance requires verification of enclosure rating and surface temperature classification by the end user — KOSA Filtration supplies material certifications and dimensional data to support that review. The Ultra-High-Purity Stainless Steel product family integrates with both Liquid Filtration and Dust & Flue-Gas Filtration system architectures, though the latter requires separate validation of cage-to-bag interface integrity under cyclic thermal load.
Common questions on ultra-high-purity stainless steel
What does ultra-high-purity mean for a housing in practice?
It means the product contact surfaces, the welds and the dead legs are all specified, not just the alloy. A 316L body with an unpurged dead leg is not an ultra-high-purity housing, whatever the material certificate says.
Why offer both PES and Nylon membranes at 0.1 micron?
They differ in compatibility rather than in rating. The rating is the same; which one survives the process depends on the chemistry and on how the cartridge is cleaned between batches.
How do the sanitary housings differ from the standard vessels?
The sanitary range uses T style Tri-Clamp connections and comes in 10 inch and 20 inch single cartridge lengths, so it can be broken down and cleaned without tools. The standard vessels use NPT or flange connections and are normally cleaned in place.