Accessories information: Re-usable friction seals are available for these plates. The standard EVA cap mat is flexible and easy to apply. For those wishing to freeze the sealed plate at –80 °C, a special PP cap mat is available. This forms a very tight seal, and because it is made of the same polymer as the plate, it expands and shrinks at the same rate, thereby ensuring that the cap mat will not loosen as the temperature changes, preventing cross-contamination between wells. A special cap mat applicator is also available designed to reduce the risk of repetitive strain injuries whilst sealing large numbers of plates.