PURIMACHOS HS GRADE 9S 25KG - PCIHS9S - DISCONTINUED H.S GRADE 9S is a ready mixed, black, trowellable fire cement for sealing in ovens and woodburning stoves. It is fibre re-enforced to stop cracking. Suitable for adhesion to vitreous enamel. Can be used up to service temperatures of 1300°C.