Description: Sample of transparent filament in a glass jar with a plastic lid - acrylic (polymethylmethacrylate) filament, labelled 'E/KT/1'. Produced under the tradename Diakon.
PMMA is a polymer of methyl methacrylate. The polymerisation process for MMA was discovered in 1877. The first commercial use of PMMA appears to have been as an alternative to glass in 1933. ICI registered the tradename Diakon in 1934 as a moulding powder for Perspex, produced by an ICI subsidiary - Mouldrite Ltd. PMMA can be melt spun to produce extremely fine filaments.