TOSOH SGM CORPORATION

Tosoh SGM Corporation’s extensive product offerings and technologies have been honed over many years to meet the diverse needs of our customers. The silica glass that we manufacture is broadly divided into two types: fused silica glass and synthetic silica glass. Each of these types is further divided into detailed grades according to their purpose of use.

Purity

Fused silica glass is mainly manufactured using natural rock crystal as the raw material, whereas synthetic silica glass is mainly manufactured using silicon tetrachloride (SiCl4) as the raw material.

Fused silica glass contains no more than ppm-level impurities, and synthetic silica glass contains no more than ppb-level impurities.
◎The following is a sample chemical analysis of typical silica glass types:

Unit: ppm

Type		Grade	Al	Ca	Cu	Fe	Na	K	Li	Mg	OH
Fused	Transparent	N	8	0.6	<0.01	0.2	0.6	0.1	0.07	0.06	200
		NP	7	0.5	<0.01	0.1	0.1	0.04	0.07	0.02	200
		S	0.7	<0.01	<0.01	0.05	0.1	<0.01	<0.01	<0.01	160
		HRP	15	0.6	<0.01	0.2	0.2	0.6	0.2	0.1	10
	Opaque	OP-1	8	0.7	<0.01	0.2	0.6	0.3	0.07	0.06	160
		OP-3	8	0.6	<0.01	0.2	0.08	0.1	0.07	0.04	160
		OP-3HD	8	0.6	<0.01	0.2	0.08	0.1	0.07	0.04	160
Synthetic	Transparent	ES*1	<0.01	<0.01	<0.01	<0.01	<0.01	<0.01	<0.01	<0.01	1000
		ED-C	<0.01	<0.01	<0.01	<0.01	<0.01	<0.01	<0.01	<0.01	<1
		ED-H	<0.01	<0.01	<0.01	<0.01	<0.01	<0.01	<0.01	<0.01	<100

(These are representative values and are not guaranteed.)

*1: The purity of ESL-1, ESL-2, ESL-1000, and ESL-2000 is the same as ES.