supply of 1. plain fire bricks, size 9 , plain fire bricks, size 9 x 4.5 x 3, grade-a (high alumina, min. 70% al₂o₃), service temper ature min. 1500 degree celsius, conforming to is:2042-2006 or latest. [ warranty period: 6 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ] , fire clay yellow cream, suitable for low to medium duty refractory applications with service t emperature up to about 1450 degree celsius. [ warranty period: 6 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]