High Alumina Refractory Cement

High alumina refractory cement is a kind of grinding water-hardening cementing material with an alumina content of about 50% in clinker and calcium aluminate as the main material. It is also known as refractory cement and can be made into low-cement high alumina castables to build or repair various high-strength furnaces and kilns, and is used for insulation or acid erosion resistance.

High alumina cement is mainly used to prepare refractory castables, such as high alumina low cement castables, which can be used to build or repair furnaces and kilns for insulation or high-temperature erosion.

The Technical Data of High Alumina Refractory Cement:

Product		CA-65	CA-68	CA-70	CA-75	CA-80
Chemical Composition (%)	Al2O3	64-66	67-69	69-71	73-75	77-80
	CaO	32-34	29-31	27-29	23-25	18-20
	SiO2	1.8	1.2	0.3	0.3	0.3
	Fe2O3	0.6	0.6	0.3	0.3	0.3
Specific Surface (cm2/g)		4500	4500	5000	5500	7000
Setting time (h:min)	Initial setting (min)	0:40	0:40	0:40	0:45	0:45
	Final Setting (min)	8:00	8:00	10:00	10:00	10:00
Cold Modulus of Rupture (MPa)	24 hour	6.0min	6.0min	6.0min	6.0min	5.0min
	72 hour	8.0min	8.0min	8.0min	8.0min	6.0min
Cold Crushing Strength (Mpa)	24hour	45.0min	45.0min	45.0min	45.0min	35.0min
	72hour	70.0min	70.0min	70.0min	70.0min	60.0min
Refractoriness (°C)		1680	1710	1730	1750	1770