Whatman 42 is a type of filter paper known for its high purity and excellent filtration properties. It is commonly used in laboratories for quantitative analysis and sample preparation, particularly in the fields of chemistry and biology. The paper is designed to retain fine particles while allowing liquids to pass through efficiently. This filter paper has a medium retention rate, making it suitable for various applications, including the filtration of precipitates and the clarification of solutions. Its consistent quality and reliability make Whatman 42 a preferred choice among researchers and scientists for precise and accurate results.