Overview
The 47mm PVDF membrane filter is a specialized microfiltration product made from polyvinylidene fluoride, a high-performance fluoropolymer. This diameter is a standard size compatible with many filtration assemblies and vacuum manifolds used in laboratories and industrial processes. The membrane's hydrophobic nature makes it particularly valuable for air and gas filtration, venting applications, and filtration of aggressive solvents where water-wettable membranes would fail. Manufacturers typically produce these membranes with controlled pore sizes ranging from 0.1 to 5.0 micrometers to suit different filtration needs.
Physical and Chemical Properties
PVDF membranes exhibit exceptional chemical resistance, withstanding acids, bases, alcohols, and halogenated hydrocarbons that would degrade other filter materials. Their thermal stability allows for autoclaving at 121°C and short-term use up to 135°C, making them suitable for sterilization processes. The hydrophobic surface prevents spontaneous wetting by water (typically requiring >3.5 bar water entry pressure for 0.45μm pores) while allowing gas flow. This property, combined with the membrane's inherent low extractables and minimal protein binding (typically <100μg/cm²), makes PVDF ideal for critical analytical applications where sample integrity is paramount.
Main Applications
In pharmaceutical manufacturing, 47mm PVDF filters are used for sterile filtration of drugs and solutions where product compatibility with the filter medium is essential. Their chemical resistance makes them suitable for filtering aggressive solvents in HPLC mobile phase preparation. Environmental laboratories employ these membranes for particulate analysis in air and water samples. The hydrophobic nature allows for efficient air monitoring and venting applications in fermentation and other bioprocesses. Industrial users value PVDF membranes for chemical process filtration where traditional membranes would fail.
Safety and Storage
While PVDF itself is biologically inert, filters should be handled with powder-free gloves to prevent contamination. Used filters may contain concentrated hazardous materials and should be disposed of according to local regulations for chemical or biological waste. For storage, keep membranes in their original packaging at room temperature, avoiding exposure to direct sunlight or high humidity which could affect performance. Shelf life is typically 3-5 years when stored properly. Before use, inspect membranes for any physical damage that could compromise filtration efficiency.
B2B Procurement Guide
When sourcing 47mm PVDF membranes, specify critical parameters including pore size (common options are 0.2μm and 0.45μm), sterility requirements (gamma irradiated or non-sterile), and packaging (individually wrapped or bulk). Request certificates of analysis for lot-to-lot consistency. For bulk purchasing (typically >1,000 units), negotiate pricing based on volume while ensuring quality standards are maintained. Consider lead times from manufacturers versus distributors. Quality indicators include consistent bubble point values (typically >3.5 bar for 0.45μm) and low extractables. Some applications may require USP Class VI or FDA compliance documentation.
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