Specifications Table

Product Name – Whatman PTFE Membrane Filter
Quantity/Pack Size – 25MM,0.2uM (Pack of 100), 25MM,1.0uM (Pack of 100), 47MM,0.2uM (Pack of 100), 47MM,0.5uM (Pack of 100), 47MM,1.0uM (Pack of 100)
Form – Membrane Disc
Grade – Laboratory Grade
Application – Filtration of aggressive solvents, air/gas sampling, HPLC sample prep

Product Overview

The Whatman PTFE Membrane Filter is engineered for superior chemical resistance and hydrophobic performance, making it indispensable for demanding laboratory applications. Constructed from pure polytetrafluoroethylene (PTFE), this filter exhibits exceptional inertness to acids, bases, and organic solvents, ensuring reliable filtration without leaching or degradation. Its uniform pore structure?available in 0.2?m, 0.5?m, and 1.0?m ratings?delivers consistent particle retention for critical processes like air/gas sampling, HPLC sample preparation, and venting applications. The membrane?s hydrophobic nature prevents moisture absorption, maintaining integrity even in high-humidity environments. Unlike cellulose or nylon filters, PTFE membranes withstand repeated autoclaving and extreme pH conditions, offering long-term durability. The smooth, non-stick surface minimizes sample loss during transfer, while the mechanically stable structure resists tearing under pressure. Available in 25mm and 47mm diameters, these filters are compatible with standard filtration setups, including syringe filters, vacuum manifolds, and in-line housings. Each pack contains 100 pre-cut discs, ensuring cost-efficiency for high-throughput workflows. The absence of binders or additives guarantees ultra-low extractables, making it suitable for trace analysis and sensitive assays. Whether used in environmental monitoring, pharmaceutical testing, or industrial QC, this filter combines precision engineering with unmatched chemical compatibility.

FAQs

1. What is the maximum temperature resistance of this PTFE membrane filter?

This filter can withstand continuous operation at temperatures up to 260?C, with short-term exposure tolerable up to 300?C without structural compromise.

2. Can this filter be used for aqueous solutions despite being hydrophobic?

While inherently hydrophobic, the membrane can be pre-wetted with alcohols like ethanol or isopropanol to enable filtration of aqueous solutions, though flow rates may be reduced.

3. How does the pore size affect filtration efficiency?

Smaller pore sizes (e.g., 0.2?m) capture finer particles and microorganisms but may clog faster, while larger pores (1.0?m) offer higher flow rates for less contaminated samples.

4. Is this filter compatible with organic solvents like acetone or dichloromethane?

Yes, PTFE?s chemical inertness makes it fully compatible with aggressive organic solvents, including ketones, halogens, and aromatic compounds, without swelling or dissolving.

5. What?s the shelf life of these filters under standard lab storage conditions?

When stored in original packaging at room temperature (15?30?C) and protected from direct sunlight, the filters retain performance for up to 5 years from the date of manufacture.