Heat Absorbing Filters

These slightly bluish glass filters feature high transmittance in the visible region and good absorption of heat rays (infrared rays).

The latter efficiently absorb thermal radiations emitted from a light source, and so are highly effective when employed for slide projectors and a variety of illumination equipment.

Note: " Strengthened glass, " produced by tempering processes, may also be supplied to minimize the cracking of filter glass due to thermal shock.

Color Filter Glass : Heat Absorbing Filter Data
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Item / Filter Type	Standard Value			Color Specification (Standard illuminants A)		Thickness	Reflective Index	Chemical Properties		Thermal Properties				Mechanical Properties		Specific Gravity
	T750 (%)	T1,000 (%)	Tav (%)	x	y	mm	nd	Dw	DA	Tg	TS	α -30/70	α 100/300	HK	FA	S
HA-30	<35	<1	80±5	0.439	0.412	3.0	1.524	2	1	555	615	58	67	570	140	2.55
HA-50	<55	<3	80±5	0.441	0.411	3.0	1.524	1	1	585	645	60	66	570	140	2.51
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Note: The listed data are standard value. Because of continuous product improvement, the various data listed are subject to change without notice.