Description
Specifications Table
Product Name – Whatman Grade 934-AH RTU Glass Microfibre Filter
Quantity/Pack Size – 24MM (Pack of 100) – 42.5MM (Pack of 100) – 47MM (Pack of 100) – 55MM (Pack of 100) – 90MM (Pack of 100)
Form – Circular discs
Grade – 934-AH (Glass Microfibre, High Retention)
Application – Gravimetric analysis, air monitoring, liquid clarification, particulate collection
Product Overview
The Whatman Grade 934-AH RTU Glass Microfibre Filter is engineered for demanding laboratory applications requiring superior particle retention and chemical resistance. Constructed from 100% borosilicate glass microfibres, this filter delivers exceptional thermal stability (up to 500?C) and mechanical strength, making it ideal for gravimetric analysis, air pollution monitoring, and liquid clarification tasks. The ready-to-use (RTU) design eliminates the need for pre-treatment, saving valuable lab time while ensuring consistent performance. Its high loading capacity and low extractables minimize sample contamination, providing reliable results even with aggressive solvents or corrosive substances. The uniform pore structure (1.5 ?m retention) effectively captures fine particulates without clogging, while the binder-free composition prevents interference in analytical procedures. Compatible with standard filtration apparatus, these filters are available in multiple diameters (24mm to 90mm) to accommodate diverse experimental setups. Their inert nature makes them particularly suitable for environmental sampling, pharmaceutical testing, and industrial process control where precision and reproducibility are critical.
FAQs
1. What is the maximum operating temperature for Whatman 934-AH filters?
These glass microfibre filters can withstand continuous exposure to temperatures up to 500°C, making them suitable for high-temperature applications like ashing procedures or thermal gravimetric analysis.
2. Can these filters be used with acidic or alkaline solutions?
The borosilicate glass composition provides excellent chemical resistance to most acids and alkalis, though prolonged exposure to hydrofluoric acid should be avoided as it can degrade the glass fibres.
3. How does the RTU designation affect filter performance?
The ready-to-use designation indicates these filters undergo a specialized washing process during manufacturing to remove surface contaminants, eliminating the need for pre-filtration rinsing while maintaining consistent weight for accurate gravimetric measurements.
4. What?s the typical flow rate for these microfibre filters?
Flow rates vary by application, but under standard conditions with water at 20°C, these filters typically exhibit a flow rate of approximately 15-20 mL/min per cm² at a pressure differential of 700 mbar.
5. Are these filters compatible with autoclave sterilization?
Yes, the glass microfibre construction allows for autoclaving at 121°C for 15-20 minutes without compromising structural integrity, making them suitable for sterile filtration applications when combined with proper aseptic techniques.
