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Silica gel is the most universal adsorbent used in TLC because it covers almost every type of separation by suitable choice of the mobile phase. Classical silica TLC plates have either a layer thickness of 250 μm (glass plates) or 200 μm (aluminum, plastic plates) and a mean particle size of 10 - 12 μm. They are available glass, aluminum or plastic backed in a broad range of different sizes to suit many application needs. The flexible backed aluminum or plastic plates can easily be cut with scissors to match individual separation requirements.