Lab filters and sieves trap particles for testing and maintain pure samples for analysis. Filter papers capture solid particles from gas or liquids for testing and identification. Filter systems and components process liquids and gases to capture particles for analysis. In-line filters and filter capsules install in a gas or water line to trap contaminants that can adversely affect test results and shorten equipment life. Extraction thimbles fit Soxhlet extractors for air and waste gas analysis. Syringe filters trap contaminants for fluids used in chromatography, dissolution testing, and other critical analysis.