Whatman 1004-930 Filter Sheets, 580 x 580mm, Grade 4, 100/pk (PN:1004-930)

These filter sheets are ideal for fast filtration of coarse particles and routine laboratory applications. They are commonly used in air pollution monitoring, biological sample cleanup, soil analysis, and general qualitative separations, where speed is more important than fine particle retention.

Whatman Grade 4 filter sheets offer a particle retention of approximately 20–25 µm with an extremely fast flow rate, making them perfect for filtering gelatinous precipitates or coarse materials quickly without clogging.

These sheets are made from high-quality cellulose fibers (cotton linters), providing consistent filtration performance, low ash content, and minimal contamination—critical for accurate analytical results in laboratory environments.

You should choose Grade 4 when you need rapid filtration and are working with coarse or gelatinous particles. If your application requires capturing very fine particles, a slower, finer grade (like Grade 5) would be more appropriate.