Core Technical Specifications

Parameter	Standard Value
Official Name	Linear Polarizer Sheet / PL Filter / Polarizing Plate
Base Material	High-precision optical glass
Effective Wavelength Range	380–700nm (visible spectrum)
Polarization Efficiency	≥99.9%
Appearance Color	Light gray
Construction	Dichroic linear polarizing film laminated between two optical glass sheets
Polarizing Film Thickness	155±10%μm
Single-Pass Transmittance	42±1.5%
Crossed Transmittance (Extinction Ratio Index)	≤0.08%
UV Block (380nm)	≤3%
Surface Hardness	≥3H scratch resistance

Product Structure & Working Principle
1. Composite laminated structure: outer protective glass layers + pressure-sensitive adhesive core + dichroic linear polarizing film
2. Filters incoming mixed/natural light to output strictly unidirectional linearly polarized light: absorbs one polarization axis strongly, transmits the orthogonal axis with minimal loss
3. Two main categories: black-white & color grade; three application types: transmission, transmission-reflection, reverse-transmission
Key Functional Benefits
1. Eliminate Non-Metal Surface Glare
Blocks polarized reflected light from glass, water, plastic, paint, and composite workpieces, erasing overexposed hotspots to restore true surface texture and sharp edge detail for machine vision inspection.
2. Adjust Exposure Brightness
Naturally reduces exposure by 1–2 stops, serves as a cost-effective substitute for ND2/ND4 neutral density filters without extra stacking.
3. Boost Contrast for Imaging & Observation
Suppresses scattered stray light; in photography/vision systems, deepens tone saturation, enhances sky-cloud contrast, and reveals details behind reflective surfaces like glass panes.
Wide Application Scenarios
1. Scientific & Laboratory Optics
Physics teaching experiments, optical research, starch optical rotation testing, 3D optical setup, lab light blocking, polarizing microscopy, interferometer assemblies.
2. Industrial & Precision Inspection
Machine vision quality control, dimensional measurement, internal stress analysis of mechanical parts, semiconductor/PCB defect scanning, laser resonant cavity systems, QC lamp inspection, solution concentration measurement.
3. Imaging & Photographic Equipment
Anti-glare shooting, dual projection systems, stereoscopic film projection, glass tempering stress testing, vision light source calibration.
4. Consumer & Optical Devices
Polarized sun lenses, LCD display panels, anti-glare automotive headlight shields, astronomical polarizing compasses, gradient/neutral density filter assemblies.
Customization Notes
• Standard size range: 8mm minimum to 150mm maximum diameter
• Tolerance: approx ±1mm for uncustomized blank sizes
• Fully customizable diameter, thickness, thread mount (M0.5/M0.7 pitch rings), and anti-reflective waterproof MC coating; contact support for bespoke drawings & quotes
Distinction: Linear PL vs Circular CPL
• Linear PL (this product): Outputs pure single-axis polarized light, mandatory for precision optical measurement, structured light vision, and lab polarization experiments.
• Circular CPL: Designed for consumer photography, avoids camera autofocus interference; unsuitable for high-precision industrial polarization control setups.

✅ Premium optical glass substrate with ≥3H scratch-hard surface coating
✅ Ultra-high polarizing efficiency ≥99.9%, ultra-low crossed transmittance ≤0.08%
✅ Visible spectrum 380–700nm coverage, stable 42% single-pass transmittance
✅ Wide size range 8–150mm, fully custom dimensions and threaded mounting rings available
✅ Multi-scenario compatibility: machine vision, lab optics, photography, stress testing, laser systems
✅ Laminated film-glass structure for long-term stability against workshop dust, moisture, and minor abrasion