Tender Notice for Mattress Single bed (Rubberised Coir) Dimensions: 1905x914 mm, total thickness 6 inch, four layers - inner core : Cross section top- bottom: 1) 28 D 20 mm PU foam 2) 25 mm 80 D Rebonded foam 3) 80 mm 70 D RC block 4 ) 25 mm 80 D rebonded foarm. Top: 250 gsm knitted fabric is quilted with 18 D 7 mm peeled foam 3 nos. together with 18 gm/sq m non-woven fabirc as backing cloth. The corner of the mattress round shaped and the quilted panels to be stitched in the taped edge machine. Bottom : 250 gsm knitted fabric. Other Description : Bed mattresses must as per IS 13489 2000 with inner cushioning material as sandwiched rubberised coir sheets as per IS 8391 Part 3 , 2018 . The resistance to ageing and durability test for PU foam shall meet the requirement of IS 7933. Preferred Brands : PEPS Hypnos, Cirrus, Rubco or similar. in Tamil Nadu