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Butvar^® B-98 is a polyvinyl butyral resin for thin film support. It is stronger and stickier than Formvar. Butvar^® B-98 is used in electron microscopy as a support film. The film is mechanically stable, electron transparent and has minimum intrinsic structure.

Butvar^® B-98 has been used for the coating of the nickel grids, used in transmission electron microscopy for mounting the samples.

Butvar is a registered trademark of Solutia, Inc.