Overview
Phase separation filter paper is a specialized cellulose or glass fiber-based material engineered for separating immiscible liquids (e.g., oil-water mixtures) or filtering particulate matter from liquids. Unlike standard filter papers, it combines capillary action and selective wettability to achieve clean phase separation. Commonly used in chemical laboratories, environmental testing, and industrial processes, these papers are rated by pore size (typically 5-20μm), flow rate, and retention efficiency. Premium grades may include additives like silicones for enhanced hydrophobic/lipophilic performance.
Physical and Chemical Properties
The material exhibits high wet tensile strength (≥0.5 kN/m) to withstand saturated conditions without tearing. Porosity ranges from 15-35%, with bubble points between 1-10 psi depending on the application. Most variants are pH-stable from 2-12. Key performance metrics include extraction efficiency (>95% for many solvent systems) and low analyte adsorption. Glass fiber versions withstand temperatures up to 500°C, while cellulose types degrade above 200°C. Ash content is typically <0.1% for quantitative analyses.
Main Applications
Primary uses include liquid-liquid extractions in pharmaceutical QC, petroleum water content testing (ASTM D4006), and food oil analysis. Industrial applications cover coolant purification, biodiesel processing, and wastewater treatment. In laboratories, specific grades are matched to techniques: coarse porosity for rapid separations, fine grades for emulsion breaking. Some medical-grade papers serve as blood plasma separators. Emerging applications include microplastic filtration from environmental samples.
Safety and Storage
Store in sealed packaging with desiccant to prevent moisture absorption (target <40% RH). Degradation signs include yellowing or reduced flow rates. Handle with powder-free gloves to avoid contamination. Dispose of solvent-soaked papers as hazardous waste where required. For flammable solvent applications, use in well-ventilated areas. Glass fiber papers may require respiratory protection during cutting to prevent airborne particles.
B2B Procurement Guide
Specify these parameters when ordering: 1) Pore size rating (μm), 2) Diameter/thickness (mm), 3) Wettability profile (hydrophilic/hydrophobic), 4) Maximum operating temperature, 5) Certifications (e.g., USP, ISO 9001). Bulk purchases (≥1000 sheets) typically offer 15-30% cost savings. Leading manufacturers include Whatman (Cytiva), MilliporeSigma, and Pall Corporation. For custom formulations, minimum orders of 500-1000m² are common with 8-12 week lead times.
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