Laboratory funnels, adapted into different forms to suit numerous specialized needs, including filtration, are ubiquitous within the lab. Funnels fitted with paper, similarly to Buchner and Hirsch funnels, can remove fine particles from a liquid, although a sintered glass frit is usually recommended for more demanding filtering applications. Funnels and filtration methods are available made up of plastic, glass, metal, or porcelain to suit any laboratory needs. Plastic funnels that don't acquire contact with solvents are generally used for transferring powders, while polyethylene funnels are used for solution transfers. Glass funnels are noted for their inertness compared to metal and plastic, while metal funnels won't chip, break or corrode.