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Ohara Products - Glass ceramic substrates for memory disks

Substrate Materials for HDD
Properties	TS-10 ST	TS10 SX	TS-10 SXC	TS-ZA	TS-ZE	TS-CZ	NiP/Al	Al-Silicate
Properties	FST*	Smooth	LZT	High Mod.	High Mod.	Super Smooth	Metal	Glass
Density (g/cc)	2,42	2,49	2,44	2,78	3,16	2,55	2,70	2,52
Modulus of Elasticity (Gpa)	92	92	91	133	185	90	71	85
Specific Modulus (E/D)	38	37	37	48	58	35	26	34
Coeff. Thermal Exp. ppm/	7,0	11,0	8,9	3,0	10,0	0,2	24,2	7,2
Thermal Conductivity (W/mK)	2,0	2,0	1,8	3,0	3,3	1,7	127,0	1,5
Heat Resistance (°C)	650	650	650	1100	1100	750	280	560
Vicker's Hardness (kg/mm²)	690	760	700	880	950	600	540	630
Water Resistance (wt loss %)	0,04	0,01	0,04	0,03	0,01	0,08
Acid Resistance (wt loss %)	0,02	0,01	0,04	0,08	0,01	0,10
Alkali Resistance (wt loss %)	0,10	0,06	0,22	0,06	0,09	0,25
Surface Roughness - AFM Å	10-20	2-6	2-6	<500 RTP	<500 RTP	1-3
*FST = Full Surface Texture (inherent crystal phase texture) TS-ZA, TS-ZE, and TS-CZ are under development