Color Filter Glass : Products & Services

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
print-friendly data tabledefinition of terms
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
print-friendly data table
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λTmax(nm): Wavelength for maximum transmittance
Tmax(%): Maximum transmittance
T254(%): Transmittance at 254nm
T405(%): Transmittance at 405nm

Note: The listed data are standard value. Because of continuous product improvement, the various data listed are subject to change without notice.