product		2	1
technical performance		"95"porcelain	"99"porcelain
check item
chemistry composition %	al2o3	93-95%	≥99%
	sio2	2-3	≤0.2
	fe2o3	≤0.03	≤0.03
	r2o	≤1.0	≤0.5
physics peformance	durable temperature ℃	1650℃	1800℃
	volume density g/cm3	≥3.5	≥3.8
	thermal expansion factor(20-1000℃)10-6/℃	5.5-7.5	6-8
	dielectric constantε	8.5-10	9-10.5
	loss 20℃(tg×10-4)	＜3	＜2
	after the surge of loss(tgδ×10-4)	＜6	＜4
	bending strength（kg/cm2）	＞2800	＞2800
	than the volume resistance（ωcm）
	20℃	1013	1013
	200-300℃	＞1012	＞1012 -＞1011
	500℃	＞1010
	thermal stability 20℃-800℃-20℃	repeatedly 10 times no cracks	repeatedly 10 times no cracks
application		electricity vacuum devices、 device ceramic、thick、 films、textile devices、plate、sintering of color phosphor and rare earth of crucible、wear porcelain pieces、 grinding pieces、ceramic liner.

Alumina crucible specifications

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