DISTRIBUTOR-FIRST SUPPLY PARTNER · SINCE 1999 Live · Compressed Air System
A coalescing filter is the middle stage of a compressed-air filtration train, the stage that removes liquid oil aerosol and water mist. As contaminated air passes through multi-layer borosilicate glass fiber media, fine airborne droplets collide and merge ('coalesce') into larger drops; those drops grow heavy enough to fall out of the air stream, drain down the inside of the housing, and collect in the sump for discharge through a condensate drain. The deeper the media grade, the smaller the droplet it can capture and the lower the oil carryover it leaves behind. It sits downstream of the dryer and a particulate pre-filter, and upstream of any activated-carbon vapor-removal stage.
Where coalescing earns its place in the filter train, and where it falls short. Review the points below.
The compressor's internal separator leaves 2-5 ppm oil carryover in the air; coalescing media takes it the rest of the way down. Regulators and particulate filters can't touch sub-micron liquid droplets.
The 0.01 micron deep-coalescing grade drops oil carryover to ~0.01 ppm; Class 1 territory. The 0.1 micron general-purpose grade gets to ~0.1 ppm (Class 2), right for typical plant and tool air.
Same collision-and-coalescing physics captures liquid water droplets after the dryer. The sump catches both oil and water; a condensate drain dumps them out together.
0.01 micron for paint, pharma, food packaging, instrumentation, anything specifying Class 1 oil. 0.1 micron for general plant air. Run both in series on critical installs: 0.1 first as a guard stage, 0.01 as the polish.
Pipe scale, rust flakes, and desiccant dust blind coalescing media in weeks. → Add upstream particulate at 5 micron, without it, the customer replaces $200 elements quarterly and blames the brand.
Glass fiber coalesces droplets; it has no mechanism for gaseous hydrocarbon. Customers specifying Class 0 total oil (liquid + vapor) need a downstream stage. → Step up to activated-carbon in series for food, pharma, breathing air, paint.
Coalescing removes oil and water, it doesn't address live bacteria. → Re-spec to medical-sterile as the final stage on NFPA 99 hospital medical-air, dental, and pharma fill lines, downstream of the full coalescing + carbon train.
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Each industry below uses this product across the listed areas. Open an industry to see how it fits the rest of its system.
Food & Beverage Processing → 
Pharmaceutical, Medical Device & Laboratory → 
Packaging & Printing → 
Metalworking & Fabrication → Also applies to Plant main-air headers · Paint shops and coating booths · Instrument and control air · Sandblasting and abrasive-blast breathing-air supply
Every entry is a real product on this site, linked to its page. Quote them on the same line item.
Stock two coalescing elements per main-line housing in the customer's MRO crib and one per point-of-use install; element supply-chain delay at change time is downtime on the line.
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