Acrylic
... Initially, acrylic acid was prepared in the laboratory over 100 years ago by the oxidation of acrolein or acrylic aldehyde, which obtained by dehydrating glycerine. ... 1 Bulk polymerised / cast sheet Acrylic At Temperature within 130 and 150 degree C cast poly methyl methacrylate becomes soft and rubbery and it is this property which makes it possible to fabricate shapes by bending or stretching under low positive and negative pressure. ... 2 Granule polymerised Acrylic Used in injection molding or extrusion has marginally different properties to bulk polymerized polymer, has marginally different properties with those of bulk polymerized polymer. ... Fabrication and Processing of Cast Sheet Acrylic 5. ... 15X Where T = time in minutes X = thickness in mm By considering all of these factors, this method will produces an isotropic acrylic sheet that is uniform properties in all direction without any grain present. ... 2 Shaping The cast acrylic sheet is also can be formed into different shape. ... There are two common method used for shaping an acrylic sheet, "free blowing" and "snap back" methods. ... Another important factor must be taken into account is that Acrylic moulding powders are not compatible with any other molding materials and therefore rigorous precautions must be taken to prevent contamination. ... Applications Because of its excellent weather resistance, particularly to UV light, cast acrylic sheet is used widely for the manufacture of outdoor signs. ... It has also mention about fabrication and processing of Cast Sheet Acrylic including forming and shaping by free blowing and snap back technique, and brief explanation on injection moulding granular polymers and compounds including type of injection moulding machine and machine temperature control. ... Acrylic acid.