supply of densified thermal bonded polyster block for use in railway coaches for seats and berths to specification no. c-k-607 .(rev.2 of december 2015.),densified thermal bonded polyster block for use in railway coaches for seats and berths to specification no. c-k-607 .(rev.2 of december 2015.),,densified thermal bonded polyster block for use in railway coaches for seats and berths to specification no. c-k-607 .(rev.2 of december 2015.),with amendment of august 2016. size of the mater ial is 1981x660x25mm & density of the material is in the range of 50 +/- 3 to 80 +/- 3 kilogram/cubic m eter(kg/m3) [ warranty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted : max 8 lacs ] ]