Description

Specifications Table

Product Name – Whatman Ashless Clippings
Quantity/Pack Size – 100g | 250g | 500g
Form – Clippings (irregular cut pieces)
Grade – Ashless (acid-washed, <0.01% ash content)
Application – Gravimetric analysis, quantitative filtration, residue testing

Product Overview

Whatman Ashless Clippings are engineered from high-purity alpha-cellulose fibers, meticulously acid-washed to achieve an exceptionally low ash content of less than 0.01%. This grade is specifically processed to eliminate inorganic impurities, ensuring minimal interference in sensitive analytical procedures. The clippings are derived from Whatman’s renowned filter paper, maintaining consistent porosity and mechanical strength for reliable performance in demanding lab environments. Their irregular cut form provides flexibility for custom filtration setups, while the 98% alpha-cellulose composition guarantees superior chemical resistance to most acids and solvents. The material’s high wet strength prevents fiber shedding during filtration, preserving sample integrity. These clippings undergo rigorous quality control to meet international standards for laboratory consumables, with batch-to-batch consistency verified through particle retention testing. The absence of binders or additives ensures no leachable contaminants, making them suitable for trace analysis where background interference must be minimized. Their neutral pH and high purity also reduce the risk of catalytic reactions that could compromise experimental results. The clippings are packaged in resealable moisture-barrier bags to maintain their pristine condition during storage and handling.

FAQs

1. What is the maximum operating temperature for these ashless clippings?

These clippings can withstand continuous use up to 120°C in dry conditions and 100°C in wet filtration applications without structural degradation. Prolonged exposure above these temperatures may affect the cellulose fibers.

2. How do these compare to standard Whatman filter paper circles?

The clippings offer identical chemical purity and filtration efficiency as Whatman’s ashless filter circles but provide cost-effective flexibility for irregular filtration setups. They’re ideal when custom sizing is needed or for bulk applications where pre-cut circles would be impractical.

3. Can these be autoclaved before use?

Yes, the clippings can be autoclaved at 121°C for 15-20 minutes without compromising their structural integrity or ash content. Autoclaving is recommended when sterile filtration conditions are required, though they should be dried thoroughly afterward to prevent microbial growth during storage.

4. What’s the typical particle retention range for these clippings?

The clippings retain particles down to approximately 2-3 microns in standard filtration setups, though actual retention depends on the filtration apparatus and flow rate. For sub-micron particles, consider using them in conjunction with membrane filters.

5. Are these compatible with organic solvents like acetone or ethanol?

The alpha-cellulose composition provides excellent resistance to most organic solvents, including acetone, ethanol, and hexane. However, prolonged exposure to strong oxidizing agents like concentrated nitric acid may degrade the fibers over time.