Whatman Ashless Quantitative Filter Paper Grade 42, 18.5cm Diameter, 2.5 Micron, Pack of 100 | Critical Gravimetric Analysis

• Diameter: 18.5cm
• Retention: 2.5µm
• A world standard for critical gravimetric analysis
• A Whatman cellulose filter is manufactured from high quality cotton linters treated to achieve a minimum alpha cellulose content of 98%
• Typical analytical precipitates include barium sulphate, metastannic acid and finely precipitated calcium carbonate
• Material: Cotton Fiber
• Diameter (cm): 18.5
• Pore Size (micron): 2.5
• Description: 42 Ashless Quantitative Filter Paper, 2.5um, 18.5cm; 100/Box

• Prepare the Filter — Carefully remove one 18.5cm Whatman Grade 42 filter paper from its pack. For critical analyses, pre-wash the filter with distilled water to remove any residual manufacturing dust.
• Set up Filtration Apparatus — Fold the filter paper into a cone and place it into a suitable Buchner funnel or filter holder. Ensure a snug fit to prevent sample bypass. Connect the funnel to a vacuum flask or filtration system.
• Perform Filtration — Slowly pour the sample containing the precipitate onto the filter paper. Apply vacuum gently to draw the liquid through. Ensure the precipitate is evenly distributed on the filter surface.
• Dry and Weigh — Carefully remove the filter paper with the precipitate. Dry it thoroughly in an oven at the appropriate temperature until constant weight is achieved. Weigh the filter paper and precipitate accurately for gravimetric determination.

Typical situations where Whatman Ashless Quantitative Filter Paper Grade 42 helps — illustrative scenarios, not customer reviews.