ASTM E1175 Determining Solar or Photopic Reflectance, Transmittance, and Absorption of Materials
ASTM E1175 test method determines the optical properties of large specimens. The solar or photopic reflectance, transmittance, and absorption are determined through this method. The final results of this method are displayed keeping in view the international standards and inch-pound units.
TRUSTED BY
Precision-driven testing for dimensional accuracy and compliance
- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Overview
ASTM E1175 is a standard test method for quantifying the total solar/photopic reflectance, transmittance, and absorptance of materials, particularly those that are large, non-uniform, textured (such as window blinds, drapes, or corrugated plastics), or possess intricate surfaces, utilizing a large integrating sphere to deliver precise optical data for quality control and performance assessment.
The goal is to quantify optical characteristics (the amount of light reflected, transmitted, or absorbed) for challenging-to-test materials that are incompatible with conventional spectrophotometers. To obtain absolute measurements, light scattered by big or textured samples is captured using a large integrating sphere.
Scope, Applications, and Benefits
Scope
The ASTM E1175 test method covers the optical properties of complex or non-uniform materials and surfaces. It proceeds with a quality check, measurements of transmittance, reflectance, and absorption, and chemical composition testing of materials. The results obtained from this method help in quality control, research, and performance evaluation of large specimens.
Applications
- Building and construction materials (glass, coatings, roofing, façade systems)
- Architectural glazing and windows for daylighting and solar heat control analysis
- Energy-efficient and green building design, including HVAC load optimization
- Automotive and transportation materials, such as windshields and interior components
- Solar control coatings and films evaluation
- Environmental and thermal modeling of structures exposed to solar radiation
Benefits
- Provides standardized, reliable measurement of the solar and photopic optical properties of materials.
- Enables accurate evaluation of reflectance, transmittance, and absorption under controlled conditions.
- Supports comparability of results across laboratories and material types.
- Assists in assessing the energy performance of materials exposed to sunlight.
- Helps identify materials that reduce heat gain and glare in built environments.
- Useful for quality control and material screening during product development.
Testing Process
Sample Preparation
Select and clean representative specimens.
1Instrument Setup
Configure and calibrate the optical measurement system.
2Measurement
Measure reflectance and transmittance over the required wavelength range.
3Reporting
Report reflectance, transmittance, and absorption with test conditions.
4Technical Specifications
| Parameter | Details |
|---|---|
| Materials | Transparent, translucent, opaque |
| Method | Spectral optical measurement |
| Wavelength Range | Solar or photopic range |
| Instrumentation | Spectrophotometer (integrating sphere as required) |
| Data Output | Integrated solar/photopic R, T, A values |
| Reporting | Results with test conditions |
Instrumentation Used
- UV–Vis–NIR spectrophotometer
- Integrating sphere attachment
- Calibrated reflectance and transmittance standards
- Sample holder or mounting stage
- Light source covering the solar/photopic range
- Data acquisition and analysis software
Results and Deliverables
- ASTM E1175 measures solar and photopic reflectance, transmittance, and absorption of materials
- Applicable to transparent, translucent, and opaque materials
- Uses spectral optical measurement techniques
- Covers solar or photopic wavelength ranges
- Requires a spectrophotometer, with an integrating sphere if needed
- Directly measures reflectance (R) and transmittance (T)
- Absorption (A) is calculated as A = 1 − R − T
- Results are reported as integrated solar or photopic R, T, and A values
Frequently Asked Questions
Case Studies
In-depth examination of genuine material testing solutions
Dopant and Ultra-Low Concentration Elemental Analysis Using STEM…
Dopant and Ultra-Low Concentration Elemental Analysis Using STEM…
Introduction to STEM-EELS for Elemental Analysis Scanning Transmission Electron Microscopy (STEM) combined with Electron Energy Loss...
Read Case StudyAnalysis of PVC Pipe Degradation Using FTIR Spectroscopy
Analysis of PVC Pipe Degradation Using FTIR Spectroscopy
PVC Pipe in Infrastructure — and Why Degradation Matters Polyvinyl chloride (PVC) pressure pipe is one...
Read Case StudyNano-scale roughness measurement of Si-wafers by Atomic Force…
Nano-scale roughness measurement of Si-wafers by Atomic Force…
Nano-scale surface roughness is a critical parameter in fabricated thin-films that are used in optics, solar...
Read Case Study
Request a Quote
Submit your material details and receive testing procedures, pricing, and turnaround time within 24 hours.
Quick Turnaround and Hasslefree process
Confidentiality Guarantee
Free, No-obligation Consultation
100% Customer Satisfaction
