The insider tips on selecting primary filter that factory veterans won’t tell you: Just look at these three numbers

Recently, a major news story broke at a new energy battery factory—the production line suddenly shut down for three hours, and the culprit turned out to be a primary filter that had been skimped on to save 200 yuan. This caused a stir in the industrial sector, as it turned out that choosing the wrong primary filter could have such severe consequences.

Veteran procurement professionals now focus on three key numbers: first, filtration precision—semiconductor factories require 0.1-micron precision, but food factories only need 5 microns, with each increase in precision doubling the price; second, flow rate parameters—a car factory once selected a low-flow filter cartridge, causing the hydraulic system to malfunction like a “heart attack”; The most common pitfall is pressure rating. A chemical company executive complained, “A supplier provided a 10 MPa filter cartridge, but it deformed at 7 MPa. Now we require suppliers to provide burst test videos.”

However, experts also caution against blindly prioritizing parameters: using 316L stainless steel filter cartridges in mask production lines is pure waste, as 304 is sufficient; in the photovoltaic industry, “combination assemblies” are popular, with inexpensive PP cotton filter cartridges used upfront to block large particles, followed by high-cost glass fiber filter cartridges in the later stages, extending lifespan by three times. Remember, a good filter cartridge isn't about cost, but about compatibility!

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