　　Phosphate refractory mortar is a high-quality mud with high-quality bauxite clinker or clay clinker as the main raw material, and solid phosphoric acid or liquid phosphoric acid as a binder. It is mainly used for masonry of High-alumina brick or Clay brick. It is divided into four grades: NP-45, LP-55, LP-65, and LP-70 according to the physical and chemical properties.

Physical and chemical indicators:

Product name		Phosphate clayRefractory mortar	Phosphate AluminiumRefractory mortar	Phosphate AluminiumRefractory mortar	Phosphate AluminiumRefractory mortar
Grade		NP-45	LP-55	LP-65	LP-70
Refractory		≥1750℃	≥1770℃	≥1790℃	≥1790
Flexural strength	110℃drying	≥2 MPa	≥2 MPa	≥2 MPa	≥2 MPa
	1200℃×3h	≥6MPa
	1400℃×3h		≥6 MPa	≥6 MPa	≥6 MPa
Softening temperature under load		≥1200℃	≥1300℃	≥1320℃	≥1550℃
Bonding time（min）		1～3	1～3	1～3	1～3
Al2O3		≥45	≥55	≥65	≥70

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