corrigendum : supply of roof sealing gasket , roof sealing gasket to drg no. ccg/wr/el/4-gk-178 alt-2 or latest alteration issued as on the date of tender publishing will be applicable. cellular rubber astm-d- 1056-1985 type ii class a gr ade - 3 with hardness shore a 30+/-5. ( this is shelf life items and should be procured with staggered delivery period. supplier to mention /print date of manufacturing on the item & item to be supplied wit hin 60 days of manufacture date.) [ warranty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]