The infrared transmission visible absorption filter is a cut-off filter made of black glass. The specific elements in the material can absorb the spectrum before a certain wavelength (760, 780, 800, 830, 850, 930) and transmit the spectrum after it. For light beams incident at different incident angles, the neutral wavelength of the filter remains unchanged. It is an economical infrared long-wave pass filter.
Model: HWB Black Glass
Specifications: Customized
Material: Optical glass
Black glass properties
| Glass brand | thickness (mm) | A[2856k] | D65 | Chemical stability | ND | α×10-7 (℃) | Tg (℃) | Ts (℃) | S | |||||
| x | y | Y | x | y | Y | DA | DW | |||||||
| HWB760 | 3 | 5 | 4 | 1.532 | 111 | 534 | 592 | 2.77 | ||||||
| HWB780 | 3 | 5 | 4 | 1.532 | 111 | 534 | 592 | 2.77 | ||||||
| HWB800 | 3 | 5 | 4 | 1.53 | 98 | 559 | 615 | 3.05 | ||||||
| HWB830 | 3 | 5 | 4 | 1.53 | 98 | 559 | 615 | 3.05 | ||||||
| HWB850 | 3 | 5 | 4 | 1.53 | 98 | 559 | 615 | 3.05 | ||||||
| HWB930 | 6 | 3 | 3 | 1.532 | 2.57 | |||||||||
Black glass technical requirements
| Brand | Thickness(mm) | λtj(nm) | λ0(nm) | Tλ0(%) | K |
| HWB760 | 3 | 760±10 | 850 | ≥83.6 | ≥0.6 |
| HWB780 | 3 | 780±10 | 900 | ≥83.6 | ≥0.5 |
| HWB800 | 3 | 800±10 | 900 | ≥83.6 | ≥0.5 |
| HWB830 | 3 | 830±10 | 930 | ≥83.6 | ≥0.5 |
| HWB850 | 3 | 850±10 | 950 | ≥80.0 | ≥0.5 |
| HWB930 | 6 | 930±15 | 1050 | ≥80.0 | ≥0.2 |
Black glass bubbles, stripes, stress class levels
| Brand | Bubbles | Stripes | Stress | Glass brand | Bubbles | Stripes | Stress |
| HWB760 | C-B | 3C | 3 | HWB830 | C-B | 3C | 3 |
| HWB780 | C-B | 3C | 3 | HWB850 | C-B | 3C | 3 |
| HWB800 | C-B | 3C | 3 | HWB930 | C | 3C | 3 |
Transmittance wavelength characteristics (reference data)
