　　Clay refractory mortar is a high-quality refractory mortar made from high-quality clay clinker as the main raw material and adding several additives. It is mainly used for building Clay brick. It is divided into four grades: NN-30, NN-38, NN-42, NN-45 according to its physical and chemical properties.

Physical and chemical indicators:

Grade		NN-30	NN-38	NN-42	NN-45
Al2O3 % ≥		30	38	42	45
Refractory ℃ ≥		1620	1680	1700	1720
Flexural bonding strength Mpa ≥	110℃×24h	1.0	1.0	1.0	1.0
Flexural bonding strength Mpa ≥	1200℃×3h	3.0	3.0	3.0	3.0
granularity %	＜1.0mm	100	100	100	100
	＞0.5mm，	≤2	≤2	≤2	≤2
	＜0.075mm	≥50	≥50	≥50	≥50
Bonding time min		1～3	1～3	1～3	1～3

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