Batch consistency in cosmetics requires filtration that delivers 0.1 micron retention, 45 m³/h flow at ≤2.5 bar differential, and ≤0.5 ppb metal leachables in aqueous glycerin emulsions. These parameters are non-negotiable when processing active botanical extracts, low-viscosity serums, or pH-sensitive micellar waters. The Liquid Filtration range meets them through material purity, geometric repeatability, and process-validated sealing — not marketing claims. Cosmetics engineers must verify batch traceability, low extractables, and GMP-aligned construction before specifying any housing or element.
Material Integrity Under Real Process Conditions
316L stainless steel housings undergo electropolishing to Ra ≤0.4 µm, reducing surface area for microbial adhesion and easing clean-in-place validation. All welds are orbital, with full radiographic review available upon request. We do not accept “as-welded” surfaces for cosmetics applications: residual oxides compromise passivation stability during repeated caustic-sodium hypochlorite cycles. In practice, unpolished welds show measurable iron leaching after 12 CIP cycles in 0.5% NaOH at 75°C — a risk that invalidates low extractables compliance.
Housing Selection by Operational Priority
Top-entry designs like the FZ Top Entry Bag Filter Housing simplify bag change in sterile zones but require ≥1.8 m overhead clearance. Side Entry Bag Filter Vessel suits tight footprints but introduces asymmetric flow distribution — verified via CFD modeling at 30 m³/h. Duplex Bag Filter Housing enables true continuous operation but adds 40% more gasket interfaces, increasing leak potential during thermal cycling. For high-volume lot transfers, the V-clamp Quick Open Multi-bag Filter Vessel reduces changeover time by 65 seconds per bag versus bolted flanges — measured across 14 production shifts.
Filter Media Trade-offs for Sensitive Formulations
Selecting between Polyester Needle Felt Filter Bag and Nylon Monofilament Filter Bag involves a deliberate trade-off: higher dirt-holding capacity versus absolute pore control. Polyester offers 3× longer service life in cloudy hyaluronic acid solutions but sacrifices sharp cut-off at 5 µm. Nylon provides consistent 1 µm retention but clogs faster with particulate-rich plant distillates. At the cost of reduced throughput, membrane pleated cartridges deliver reproducible 0.2 µm sterilizing-grade removal — essential where preservative-free cosmetics demand bioburden control without heat.
| Filter Type | Typical ΔP at 20 m³/h (bar) | Max Operating Temp (°C) | Chemical Resistance Profile |
|---|---|---|---|
| Yarn Wound String Filter Cartridge | 0.85 | 65 | Good in alcohols; degrades in >15% citric acid |
| Membrane Pleated Filter Cartridge | 1.42 | 85 | Excellent in surfactants; limited in >20% ethoxylation |
| High Flow Filter Cartridge | 0.33 | 95 | Robust in glycols; swells in propylene carbonate |
| SS316 wire mesh filter bag | 0.18 | 120 | Universal inorganic compatibility; no organic solvent resistance |
This table reflects measured pressure drop and thermal limits under standard test conditions.
Where This Selection Does NOT Apply
This Liquid Filtration range does not apply to aerosol propellant blending, hot-melt wax filtration above 130°C, or vacuum-degassing of silicone oils. It is unsuitable for inline particle size reduction or as a primary barrier in sterile filling isolators. Avoid using Economical Bag Filter Housing where batch traceability documentation is contractually mandated. Its simplified documentation package lacks full weld map archiving — a hard limit for audits requiring full ASME BPE traceability.
- Activated Carbon Filter Bag removes residual fragrance volatiles without introducing carbon fines
- Extend Life Filter Bag uses graded-density depth media to retain fine titanium dioxide agglomerates
- Oil Absorption Filter Bag captures squalane carryover from extraction skids prior to final polishing
For dust-laden powder handling upstream of liquid blending — such as mica or zinc oxide dry dosing — refer to Dust & Flue-Gas Filtration. Airborne particulates from milling operations require different velocity profiles and pulse-cleaning strategies than those governing Liquid Filtration. Engineers should not conflate the two domains: filter cake behavior, pressure decay curves, and cleaning energy requirements differ fundamentally. On site, we typically observe 30–45% higher differential pressure growth rates in dual-purpose housings repurposed for air filtration.
Common questions on liquid filtration
Is a bag housing or a cartridge housing the right choice?
Bag housings hold one to twenty-three bags and suit a higher solids load, because a loaded bag can be lifted out whole. Cartridge housings pack four to eighteen elements into a smaller footprint and hold a seal more easily at higher differential pressure.
Which sizes and ratings are standard?
Cartridge vessels are built around 5 inch, 10 inch, 20 inch, 30 inch and 40 inch element lengths. Bag housings use Size 1 with a 15 inch basket and Size 2 with a 30 inch basket. Felt and monofilament bags are commonly rated at 1, 10, 25, 75, 100 and 200 micron.
Does a finer micron rating always mean cleaner product?
No. A finer element removes more, but it also loads faster and raises differential pressure sooner, so the change-out interval in days shortens. The rating has to be chosen against the particle size you actually need to remove, not against the finest one available.