Ultraviolet Transmitting, Visible Absorbing Filters

These are dark glass filters, nearly black, which transmit the ultraviolet region but absorb the visible region. They transmit slightly in the near-infrared region.

The glass type figure represents the wavelength that provides the maximum transmittance. These filters are chiefly used for single extraction of the ultraviolet rays, and are often utilized for selectively transmitting the 253.7nm and 365nm wavelengths, which are the representative line spectra of mercury lamps.

Color Filter Glass : Ultraviolet Transmitting, Visible 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
	λTmax (nm)	Tmax (%)	T254 (%)	T405 (%)	x	y	mm	nd	Dw	DA	Tg	TS	α -30/70	α 100/300	HK	FA	S
U-325C	325±5	-	>55	<10	0.555	0.299	4.5	1.554	4	3	452	496	93	65	381	221	2.89
U-330	330±5	85±5	>40	<15	0.570	0.209	2.5	-	4	5	470	505	82	93	420	230	2.78
U-340	340±5	75±5	<1.0	<0.1	-	-	2.5	-	4	4	530	565	85	96	430	250	2.92
U-350	354±5	50±5	<0.01	<0.5	-	-	2.5	-	3	1	525	570	94	111	560	140	2.83
U-360	360±5	70±5	<0.01	<1.0	-	-	2.5	-	3	2	520	560	100	111	560	140	2.74
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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.