Overview
The glass filter funnel is a fundamental tool in laboratories for separating solids from liquids via vacuum filtration. Typically constructed from borosilicate glass, it resists thermal stress and chemical corrosion, making it suitable for diverse applications. Its design includes a perforated plate to support filter paper and a stem for connection to vacuum systems. Standard variants include Büchner funnels (flat perforated plate) and Hirsch funnels (conical shape). Amber glass versions are used for light-sensitive compounds. The funnel's transparency allows real-time observation of filtration progress, critical for quality control in pharmaceuticals and research.
Physical and Chemical Properties
Borosilicate glass, the primary material, offers a low coefficient of thermal expansion (3.3 × 10−6/K), ensuring stability under rapid temperature changes. Its density (~2.23 g/cm³) and hardness (Mohs 6.5) provide durability, while chemical inertness permits use with acids, bases, and organic solvents. The funnel's perforated plate typically has pores of 10–20 µm diameter, compatible with standard filter papers. Joints (e.g., 24/29) are standardized for airtight connections. Heat resistance up to 400°C allows oven drying of filtered samples, though sudden temperature shifts should be avoided to prevent cracking.
Main Applications
Glass filter funnels are indispensable in analytical chemistry for preparing particulate-free solutions, such as HPLC mobile phases. In pharmaceuticals, they sterilize injectables by removing microbial contaminants. Environmental labs use them for soil and water sample analysis. Industrial applications include catalyst recovery in chemical synthesis and purification of dyes. Their compatibility with aggressive solvents (e.g., acetone, DMSO) distinguishes them from plastic alternatives. Specialty funnels with fritted glass discs eliminate the need for filter paper, enabling repeated use in gravimetric analysis.
Safety and Storage
Always inspect for cracks before use, as compromised glass can fail under vacuum pressure. Use clamps to secure the funnel to avoid slippage during operation. Thermal shock risks can be mitigated by preheating the funnel when filtering hot solutions. Store in padded racks or protective sleeves to prevent chipping. Clean with non-abrasive brushes and compatible solvents (e.g., nitric acid for organic residues). For hazardous materials, pair with sealed filtration assemblies to minimize exposure. Label funnels used for toxic compounds to prevent cross-contamination.
B2B Procurement Guide
When sourcing in bulk, prioritize suppliers with ISO 9001 certification for consistent quality. Specify glass type (e.g., Schott Duran or Pyrex) and joint size (e.g., NS 29/32) to match existing labware. Thicker walls (≥3 mm) enhance longevity for high-throughput labs. Customization options include etched graduations or PTFE-coated joints for better sealing. MOQs typically start at 50–100 units, with bulk discounts available. Lead times vary from 2–6 weeks for specialty items. Verify compliance with ASTM E438 (Standard Specification for Laboratory Glassware) or equivalent regional standards.
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