Auto-Darkening Welding Filters -- LWT Advanced Optics

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An optical filter is a key component in auto-darkening welding helmet systems. The filter effectively

blocks UV and IR radiation while allowing visible light to transmit, and therefore provides UV and IR

protection for human eyes and liquid crystal devices. LWT can provide the filters with excellent

chemical stability, superior optical performance, and competitive price to customers.

OPTICAL PERFORMANCE
Wavelength(nm)	Average Transmittance(%)
210-313	<0.001
313-380	<0.01
380-780(passband falls into this range)	45~55
780-1300	<0.1
1300-2000	<0.01

ENVIRONMENTAL AND ENDURANCE CHARACTERIZATIONS
Tests	Conditions
Low Temperature Test	> 8 hours @ -45 degree C
Humidity Test	> 24 hours @ 40 degree C/90% RH
High Temperature Test	> 200 hours @ 90 degree C
Immersion Test	>72 hours in pure water

SUBSTRATES SPECIFICATIONS
Material	Schott B270
Thickness(mm)	1.1
Surface quality	80/50
Dimension
Length × Width(mm × mm)
101×46	96×48
94.5×36	103×47.5
103×54	106×54
114×54	103×45
103×38	104×52
Note:Other dimensions are available upon request.

Address:1252 Inca Drv.,Oxnard,CA 93030,USA Tel:1-805-988-9244 LWT@lightwavetek.com