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ASTM D1003 Standard Test Method for Haze and Luminous Transmittance of Transparent Plastics
Last updated May 7, 2025
ASTM D1003 Standard Test Method for Haze and Luminous Transmittance of Transparent Plastics
ASTM D1003 provides a standard method for determining the haze and luminous transmittance of clear plastic materials. Both properties are necessary for evaluating optical clarity, particularly when it is important to be able to see through a material. The standard describes the use of a haze meter for measuring scattered light and measuring the total transmitted light through the sample. It can be used for film and sheet forms of transparent plastics. ASTM D1003 measurements assist in maintaining product uniformity, improving visual performance, and ensuring quality control during production. The technique can be implemented using integrating sphere or collimated beam equipment.
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ASTM D1003 Introduction
Clear plastics find broad application in auto, packaging, electronic, and building applications where optical clarity and light transmission are important to product function. ASTM D1003 presents a comprehensive and precise procedure for measuring haze, induced by light scattering from surface or internal defects, and luminous transmittance, an assessment of the total light transmitted through the material. This dual analysis enables producers to measure both the transparency and brightness of clear products. Proper haze and transmittance values are essential to product specifications, process defect detection, and visual quality assurance. ASTM D1003 is commonly used on materials like polycarbonate, acrylic, PET, and other optical-grade plastics. It provides consistent and reproducible results across batches of production and among laboratories.
ASTM D1003 Test Method
Haze Measurement
Place the specimen in the haze meter; measure the percentage of light diffusely transmitted through the sample.
Luminous Transmittance
Measure the total light passing directly and diffusely through the specimen using an integrating sphere.
Instrument Calibration
Perform calibration using certified haze and transmittance standards before each test series to ensure accuracy.
ASTM D1003 Equipment and Sample Preparation
Specimen Preparation
Cut specimens from the plastic sheet using a precision die cutter to avoid edge deformation.
Specimen Dimensions
Rectangular or circular samples with a minimum size of 50 mm × 50 mm and uniform thickness between 1–6 mm.
Haze Meter or Spectrophotometer
Use an instrument with an integrating sphere geometry conforming to 4° observer angle and standard illuminant C.
ASTM D1003 Results and Interpretation
The haze value is reported as a percentage, representing the ratio of diffusely transmitted light to the total transmitted light. Higher haze percentages indicate more scattering and reduced clarity, which may be unacceptable in applications like lenses or display covers. Luminous transmittance, also given as a percentage, reflects the brightness of light passing through the material. A result near 100% indicates excellent transparency, suitable for glazing or lighting covers. If values fall outside specification limits, it may indicate contamination, improper molding, or material degradation.
ASTM D1746 addresses the clarity of plastic sheeting using a different clarity-specific method. ASTM D1925 provides the standard for yellowness index evaluation, often tested alongside haze. ASTM E1348 describes the measurement of color and color difference, relevant when haze affects visual appearance. These related standards support full optical characterization of plastic materials.
Applications of ASTM D1003 in Industry
Transparent plastics evaluated under ASTM D1003 are used in automotive headlamp covers, skylights, protective shields, greenhouse panels, electronic displays, and medical device enclosures. Optical quality is essential in these products for both functionality and aesthetics. The haze and transmittance values guide material selection and help in predicting performance under lighting and visual inspection conditions.