Good filter but hoya needs to make the U330 on quartz so that the 190-230nm region is allowed to pass.
Hoya UV Transmitting Filter (U Series) – Visible Light Absorbing Optical Glass
HOYA U-Series Ultraviolet Transmitting, Visible Absorbing Filters for Industrial Applications
HOYA CANDEO U-Series filters are precision ultraviolet transmitting filters designed to pass UV wavelengths while absorbing visible light. Engineered for fluorescence excitation, UV inspection, photolithography, and scientific research. Standard 50x50mm square format.
Key Features
- High UV transmission with effective visible light absorption
- Multiple grades for different UV wavelength ranges (254nm, 340nm, 360nm, 365nm)
- Precision optical glass construction
- Standard 50x50mm square format for industrial applications
- Suitable for fluorescence excitation, UV inspection, and photolithography
Spectral Transmittance
Technical Data
U Series — UV Transmitting, Visible Absorbing (U330 / U340 / U360)
| Item | Standard Value | Color Specification (Std. Illuminant A) | Thickness (mm) | Refractive Index (600nm) | Chemical Property | Thermal Properties | Thermal Expansion (×10⁻⁷/K) | Mechanical Properties | Specific Gravity (d) | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tmax (%) | T254 (%) | T405 (%) | x | y | DW | DA | Tg (°C) | Ts (°C) | α -30/70 | α 100/300 | HK | FA | ||||
| 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 |
UL254S — Broadband UV Transmitting Filter
| Item | Standard Value | Color Specification (Std. Illuminant A) | Thickness (mm) | Refractive Index (600nm) | Chemical Property | Thermal Properties | Thermal Expansion (×10⁻⁷/K) | Mechanical Properties | Specific Gravity (d) | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| T254 (%) | T310 (%) | T365 (%) | x | y | DW | DA | Tg (°C) | Ts (°C) | α -30/70 | α 100/300 | HK | FA | ||||
| UL254S | ≥70 | ≥85 | ≥83 | – | – | 2.5 | 1.551 | 4 | 3 | 450 | 500 | 93 | 65 | 380 | 220 | 2.89 |
UL365S — 365nm UV Transmitting Filter
| Item | Standard Value | Color Specification (Std. Illuminant A) | Thickness (mm) | Refractive Index (600nm) | Chemical Property | Thermal Properties | Thermal Expansion (×10⁻⁷/K) | Mechanical Properties | Specific Gravity (d) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| T365 (%) | T405 (%) | T694 (%) | T750 (%) | x | y | DW | DA | Tg (°C) | Ts (°C) | α -30/70 | α 100/300 | HK | FA | ||||
| UL365S | ≥73 | ≤7 | ≤3 | ≤45 | – | – | 3.25 | 1.532 | 1 | 1 | 527 | 687 | – | 88 | 490 | 100 | 2.61 |
U340A — UV Transmitting Filter (Low Fluorescence)
| Item | Standard Value | Color Specification (Std. Illuminant A) | Thickness (mm) | Refractive Index (600nm) | Chemical Property | Thermal Properties | Thermal Expansion (×10⁻⁷/K) | Mechanical Properties | Specific Gravity (d) | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tmax (%) | T254 (%) | T405 (%) | x | y | DW | DA | Tg (°C) | Ts (°C) | α -30/70 | α 100/300 | HK | FA | ||||
| U340A | 75±5 | <1 | <0.1 | – | – | 2.5 | 1.565 | 1 | 1 | 609 | 643 | 67 | 80 | 430 | 170 | 2.98 |
* Click each item name to download the HOYA CANDEO technical data sheet (PDF).
📋 Quality & Compliance Information
For ISO certifications, environmental compliance, 12-month warranty details, and handling guidelines, visit our Industrial Filters - Quality & Compliance page.
📊 Colored Glass Filters Comparison Chart
Compare optical properties across all HOYA CANDEO colored glass filter series. View Comparison Chart →
