enquiry for supply of sign boards , informatory direction board of trapezoidal shape having size 900x900mm and 900+450 / 2x450mm made of sandwiched construction with a thermoplastic core of low density polythene ( ldpe ) between two thick skins / sheets of aluminium composite material ( acm ) of 3 mm thick and aluminium skin thickness of 0 . 25-0 . 3mm on both sides . the retro-reflective sheeting must be applied on top surface with aluminium surface with recommended surface penetration from sheeting manufacturer . the mechanical properties of 3mm thick acm and that of its skin shall confirm to the requirement given in irc: 67-2012 table 6 . 1 , when tested in accordance with the test method mentioned against each of them . retro-reflective sheeting as per astm d4956-09 type i and ii class a . all the frames of the board shall be made of superior quality stainless steel of grade 304l finely polished as per drawing no . 1 attached . colour of the board and front of letters shall be got approved from hq ce ( p ) udayak . , informatory sign board of rectangular shape having size 900mm x900mm and 900mmx450 ( box type ) made of acrylic sheet 4mm thick duly printed on both side by using retro-reflective sheeting as per astm d4946- 09 type i and ii class a . all the frames of board shall be made of superior quality stainless steel of grade 304l finely polished as per drawing no . 2 attached . acrylic sheet and writings shall be on both side of board and made to be box having fitted with 5 nos led tube lights of 20w and all the sides other than front and rear shall be made of ss sheets of same grade and finish all complete . , informatory sign board of rectangular shape having size 900mm x900mm and 900mmx450 ( box type ) made of acrylic sheet 4mm thick duly printed on one side by using retro-reflective sheeting as per astm d4946- 09 type i and ii class a . all the frames of board shall be made of superior quality stainless steel of grade 304l finely polished as per drawing no . 3 attached . acrylic sheet and writings shall be on one side of board and made to be box having fitted with 5 nos led tube lights of 20w and all the sides other than front shall be made of ss sheets of same grade and finish all complete and drawing no . 3 . , informatory direction board of rectangular shape having size 1450x1464mm made of aluminium composite material ( acm ) of 3 mm thick and aluminium skin thickness of 0 . 25-0 . 3mm on both sides . the retro-reflective sheeting must be applied on top surface with aluminium surface ( one side only ) with recommended surface penetration from sheeting manufacturer . the mechanical properties of 3mm thick acm and that of its skin shall confirm to the requirement given in irc: 67-2012 table 6 . 1 , when tested in accordance with the test method mentioned against each of them . retro-reflective sheeting as per astm d4956-09 type i and ii class a . all the frames of the board shall be made of superior quality stainless steel of grade 304l finely polished as per drawing attached . colour of the board and front of letters shall be got approved from hq ce ( p ) udayak . the acm sheet shall be fixed on a ss angle frame using 30x30x2mm size adequately strengthened to keep it straight all complete as per drawing no . 4 .