Ultraviolet Transmitting, Visible Absorbing Filters (U)

Ultraviolet transmitting, visible absorbing filters transmit the ultraviolet region but absorb the visible region. These filters are mainly used for single extraction of ultraviolet radiation. They are often utilised for selectively transmitting the 253.7 nm and 365 nm wavelengths, which are the representative spectral lines of mercury lamps.

Applications: Medical, light sources, inspection

Item	Standard Value			Colour specification (Standard illuminants A)		Thickness	Refractive Index	Chemical properties		Thermal properties				Mechanical properties		Specific gravity
	Tmax(%)	T254(%)	T405(%)	x	y	mm	600 nm	DW	DA	Tg	Ts	α -30/70	α 100/300	HK	FA	d
U330	85±5	>40	<15	–	–	2.50	1.552	4	5	470	505	82	93	420	230	2.78
U340	75±5	<1.0	<0.1	–	–	2.50	1.571	4	4	530	565	85	96	430	250	2.92
U360	70±5	<0.01	<1.0	–	–	2.50	1.537	3	2	520	560	100	111	560	140	2.74

Item	Standard Value			Colour specification (Standard illuminants A)		Thickness	Refractive Index	Chemical properties		Thermal properties				Mechanical properties		Specific gravity
	T254(%)	T310(%)	T365(%)	x	y	mm	600 nm	DW	DA	Tg	Ts	α -30/70	α 100/300	HK	FA	d
UL254S	≥70	≥85	≥83	–	–	2.50	1.551	4	3	450	500	93	65	380	220	2.89

Item	Standard Value				Colour specification (Standard illuminants A)		Thickness	Refractive Index	Chemical properties		Thermal properties				Mechanical properties		Specific gravity
	T365(%)	T405(%)	T694(%)	T750(%)	x	y	mm	600 nm	DW	DA	Tg	Ts	α -30/70	α 100/300	HK	FA	d
UL365S	≥ 73	≤ 7	≤ 3	≤ 45	–	–	3.25	1.532	1	1	527	687	–	88	490	100	2.61

The listed data are standard values. As we are always improving our products, the data listed are subject to change without notice.