Description
Specifications Table
Product Name – Whatman PM 2.5 PTFE W/PP RING Membrane Filter
Quantity/Pack Size – 50MM (Pack of 50)
Form – Membrane Filter with PP Support Ring
Grade – Analytical/Laboratory Grade
Application – Air monitoring, solvent filtration, particulate analysis
Product Overview
The Whatman PM 2.5 PTFE membrane filter with polypropylene ring is engineered for high-performance particulate filtration in demanding laboratory environments. Constructed from pure polytetrafluoroethylene (PTFE), this 2.5µm pore-size filter combines exceptional chemical resistance with hydrophobic properties, ensuring reliable separation of fine particulates from gases or aggressive solvents. The integrated polypropylene support ring enhances structural integrity during handling and high-flow applications, preventing membrane deformation under pressure. Its uniform pore distribution guarantees consistent retention efficiency, while the inert PTFE material eliminates extractables that could compromise sensitive analyses. The filter’s thermal stability (up to 260°C) and compatibility with autoclavable processes make it suitable for sterile applications. Unlike cellulose-based alternatives, this PTFE membrane resists swelling in organic solvents and maintains dimensional stability across pH 0-14, offering versatility for diverse filtration protocols. The white opaque membrane provides clear visual contrast for particulate inspection, and its low protein-binding characteristics minimize sample loss during biological filtrations. Designed for single-use applications, each filter undergoes individual quality control to ensure pore size consistency and defect-free performance. The 50mm diameter format balances high throughput with compatibility for standard filtration apparatus, while the pack of 50 units offers cost-effective bulk provisioning for frequent users.
FAQs
1. What is the maximum operating temperature for this PTFE membrane filter?
This Whatman PTFE membrane filter maintains structural integrity and performance at continuous operating temperatures up to 260°C, with short-term exposure tolerance to 300°C, making it suitable for high-temperature gas filtration or sterilization processes.
2. Can this filter be used with aqueous solutions despite being hydrophobic?
The PTFE membrane’s inherent hydrophobicity prevents spontaneous wetting by water, but it can be pre-wetted with ethanol or isopropanol (30-50% solution) to enable aqueous filtration, though this may temporarily reduce flow rates until the membrane stabilizes.
3. How does the polypropylene ring affect filtration performance?
The polypropylene support ring serves as a rigid frame that prevents membrane sagging under vacuum or pressure differentials, maintaining uniform flow distribution across the entire filter surface while allowing full utilization of the 50mm filtration area without edge bypass.
4. What sterilization methods are compatible with these filters?
These filters support autoclaving at 121°C (15 psi) for 30 minutes, gamma irradiation (up to 50 kGy), and ethylene oxide sterilization without compromising pore integrity or introducing extractables, provided the polypropylene ring’s temperature limits are observed during autoclaving.
5. Are there detectable extractables from this PTFE membrane during solvent filtration?
Independent testing confirms this PTFE membrane exhibits negligible extractables (<0.1% by weight) when challenged with common organic solvents like acetone, methanol, or hexane, with the polypropylene ring contributing minimal leachables due to its high-purity medical-grade composition.
