Need reliable filter paper for your lab? This is the Whatman Grade 597-1/2, a classic choice for tons of routine analytical jobs. Each pack comes with 100 sheets of folded (pleated) filter paper, each one 185mm in diameter. The key spec is its retention rate: it traps particles in the 4 to 7 micron range, making it a medium-fast paper with medium to fine retention. It's got a filtration speed of about 70 herzberg, a typical thickness of 180µm, and a basis weight of 85g/m². Where do you use it? All over the place! It's super common in food testing labs – like for determining fat content according to methods like the German LMBG. It's also a star in beverage analysis, especially for beer, where it helps remove carbon dioxide and turbidity following EBC or MEBAK standards. Whether you're in quality control, research, or production, having a box of these versatile, quantitative-grade filters on your shelf is always a smart move. They provide consistent, predictable results for your separations and clarifications.