SEANA INTERNATIONAL (CHINA) LTD.

Table1

Ceramic roller and insulator

Item		Unit	97%alumina	95%alumina	92%alumina	75%alumina	Steatite
1IMHz20℃ Dielectric Constant:			9.3~9.7	8~10	8.8~9.3	8.3~9	6~7
Medium Loss Tg δ	20 ℃	x 10^-4	0.6~1	1.5~2.8	1.1~1.2	3~5	3~6
	80℃		0.5~0.6	1.6~2.8	2	4~8	6~7
	Moisture		1.5~1.9	1.8~3.9	1.5
Anti break strength		N/cm²	29000~38800	25000~4880	23000~30000	20000	16000~20000
Linear enpansion coefficient		x10^-6/ ℃		6.5~8.5	6.3~7.3	≤ 6	6.5~7
Insulation Strength Ruy		Ω· cm	6x10¹⁴	10¹⁴	10¹³	10¹³	10¹³
Anti pomer strength EUP		Kv/mm	16~24	15~35	> 15	> 20	> 20

		ZJ1	ZJ2	ZJ3
Alumina Content	%	75-77	77-78	78-80
Density	G/cm³	2.45-2.50	2.50-2.55	2.55-2.6
Water absorption	%	10-11	9-10	8-9
Flexural strength	Mpa	45-50	50-55	55-60
Thermal expansion(20-1000 ℃ )	1/K	6 x 10 ^-6	6.2 x 10 ^-6	6 x 10 ^-6
Yungis modulus	Gpa	60	70	80
Temperature limit*	℃	1300	1350	1400
Thermal Shock Resistance		very good	Good	Very good

OD x ID x L	OD x ID x L	OD x ID x L	OD x ID x L
OD42 x 32 x 2930*	OD40 x 30 x 2320	OD33.70 x 2000	OD25 x 2330
OD42 x 32 x 3000*	OD40 x 30 x 2100	OD33.70 x 1800	OD25 x 1800
OD42 x 32 x 3200*		OD33.70 x 1600	OD25 x 1700
OD42 x 32 x 2900*	OD45 x 35 x 2850*	OD33.70 x 1150	OD25 x 1500
OD42 x 32 x 3240	OD45 x 35 x 3080
OD42 x 32 x 2600	OD45 x 35 x 3200	OD30 x 2600	OD27 x 17 x 3000
OD42 x 32 x 2480	OD45 x 35 x 3480	OD30 x 2400
	OD45 x 35 x 2000	OD30 x 2320
OD40 x 30 x 2630*	OD35 x 2450	OD30 x 2100
OD40 x 30 x 2260*	OD35 x 2000	OD30 x 2000
OD40 x 30 x 2000		OD30 x 1900
OD40 x 30 x 1800	OD31 x 21 x 2400*	OD30 x 1800
OD40 x 30 x 1500	OD31x 21 x 2030*
OD40 x 30 x 1200	OD31 x 21 x 2600*	OD27 x 2630
OD40 x 30 x 3230	OD31 x 21 x 2630	OD27 x 2400
OD40 x 30 x 3000		OD27 x 2100
OD40 x 30 x 2740	OD33.70 x 2700	OD27 x 1800
OD40 x 30 x 2600	OD33.70 x 2500	OD27 x 1600
OD40 x 30 x 2400	OD33.70 x 2360

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