ISO 14782 Plastic Haze and Transmittance Test

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Mechanical testing in the packaging industry determines the packaging's resistance to compression, impact, and tension, directly ensuring the safety of contents during storage and transportation. UnitedTest can cover comprehensive mechanical testing for packaging, complying with ISO, ASTM Standards, and provides customized testing solutions for compression, drop, tear, and more.

Mechanical testing in the transportation industry concerns the load-bearing and fatigue resistance performance of core components such as vehicles, tracks, and containers, directly ensuring transport safety and equipment durability. UnitedTest can cover mechanical testing for all types of transportation materials, complying with national and international standards, and provides customized testing solutions including tensile, fatigue, and impact tests.

Metallurgical testing examines the properties of metallic materials to determine if a particular metal is appropriate for its intended use.

Testing of polymer materials covers mechanical, thermal, and chemical properties, verifying strength, heat resistance, composition, and ensuring product quality and compliance.

UnitedTest offer world-class testing solution in testing for polymeric materials, including elastomers, thermoplastics, composites, coatings, and structural adhesives in a variety of industries.

Testing of rubber and elastomers is used to assess the various properties and performance of materials under different conditions. This is crucial for ensuring the safety, functionality, and quality of rubber and elastomer products used in industries such as automotive, construction, consumer goods, and aerospace.

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Tensile test evaluates material resistance to stretching, measuring strength/elongation critical for quality control. UnitedTest offers universal tensile testers (10-600KN) compliant with ASTM/ISO standards, providing tailored solutions for metals, polymers, medical & industrial materials.

Compression test assesses material resistance to compressive loads, measuring strength/deformation critical for quality validation. UnitedTest offers compression testing machines compliant with ASTM/ISO standards, providing tailored solutions for concrete, plastics, metals and industrial components.

Flexural & Bend tests evaluate material resistance to bending forces, measuring strength, stiffness and ductility for quality assurance. UnitedTest provides flexural testing machines (3-point/4-point bend) compliant with ASTM/ISO standards, offering tailored solutions for composites, plastics, metals and construction materials.

Torsion Test evaluates material resistance to rotational forces, measuring torsional strength/ductility critical for fasteners, insulators, shafts. UnitedTest offers torsion testers compliant with ASTM A938/ISO 16047, providing tailored solutions for automotive, aerospace, fastener industries.

Fatigue Test assesses material durability under cyclic loading, critical for predicting service life of industrial components. UnitedTest offers fatigue testing systems (axial/bending/torsion) compliant with ASTM E466/ISO 12106, providing tailored solutions for automotive, aerospace and manufacturing sectors.

Peel Test measures material adhesion strength by evaluating resistance to peeling forces, critical for adhesives, films, packaging. UnitedTest offers peel testers compliant with ASTM D903/ISO 8510, covering 90°/180° peel tests, and tailored solutions for packaging, automotive, textile industries.

Impact Test evaluates material resistance to sudden shock loads, critical for assessing toughness and fracture risk. UnitedTest offers impact testers (Charpy/Izod/fall weight) compliant with ASTM E23/ISO 148, providing tailored solutions for metals, plastics, glass and industrial components.

Tear & Shear Test evaluates material resistance to tearing and shearing forces, measuring critical strength parameters for quality control. Tear tests (Elmendorf/trouser/trapezoidal) assess resistance to crack propagation in films/fabrics, while shear tests measure resistance to parallel forces in joints/bolts. UnitedTest provides universal testing machines (10KN-600KN) with specialized fixtures for both tests, compliant with ASTM D624/D3164 and ISO standards, serving automotive, packaging and construction industries.

Hardness test measures material's resistance to permanent indentation, critical for quality control. UnitedTest offers universal hardness testers (Rockwell/Brinell/Vickers) compliant with ASTM/ISO standards, plus tailored hardness testing solutions for diverse industrial needs.

Biaxial/triaxial tests evaluate material performance under multi-axis loads, critical for biomaterials, metals and composites. UnitedTest provides compliant testing machines (ASTM/ISO) for planar biaxial, static/fatigue triaxial tests, with tailored solutions for industrial & biomedical needs.

Friction and wear tests assess material resistance to friction, abrasion and wear, critical for industrial material performance validation. UnitedTest offers tribometers compliant with ASTM G99/ISO standards, covering pin-on-disk, four-ball tests, and tailored friction & wear testing solutions for diverse industries.

Pressure test evaluates material/component resistance to static/dynamic pressure, critical for sealing, strength and safety validation. UnitedTest offers pressure testing machines compliant with ASTM/ISO standards, covering burst, hold-pressure tests, and tailored solutions for industrial, automotive & medical sectors.

Fire test assesses material flammability, heat resistance and fire-retardant performance, critical for safety compliance across industries. UnitedTest offers fire testing equipment compliant with ASTM/ISO/UL standards, providing tailored fire test solutions for building materials, plastics and industrial components.

Non-destructive Test (NDT) evaluates material/component integrity without damage, critical for safety & quality across industries. UnitedTest offers ultrasonic/X-ray/magnetic particle NDT equipment compliant with ASTM/ISO standards, plus tailored NDT solutions for aerospace, automotive & manufacturing sectors.

ISO 14782 Standard | Haze Measurement Tester for Transparent Colourless Plastics | UnitedTest

UnitedTest is a professional manufacturer that designs and produces fully ISO 14782 compliant haze testing machines for plastic film, sheet, packaging and optical material labs across the globe.

ISO 14782 Plastics – Determination of haze for transparent material is an international standardized optical test norm dedicated to transparent plastic substrates. It establishes unified laboratory testing procedures to measure haze value, an optical parameter generated by wide-angle light scattering inside plastic samples.

This standard applies to flat, nearly colourless transparent plastics and delivers accurate haze quantification results with a valid measuring range limited to haze levels below 40%. Test data from ISO 14782 serves as key quality indicators to evaluate the clarity and visual uniformity of transparent plastic packaging, optical panels and rigid plastic sheets during raw material inspection and finished product quality control.

Our UnitedTest haze meter strictly follows all light source setup, specimen positioning, calibration and calculation requirements specified in ISO 14782, providing stable, repeatable wide-angle light scattering detection results for polymer manufacturers, third-party testing institutes and packaging R&D facilities.

Core Test Principle

Haze is defined as the percentage of total transmitted luminous flux scattered at wide angles when light passes through transparent plastic, calculated via a four-flux compensation algorithm to eliminate instrument inherent scattering errors.

Optical separation logic:

τ₁: Incident light intensity (white reference on compensation port, light trap on exit port, no specimen).

τ₂: Total light transmitted through specimen (specimen at entrance, white reference on compensation, light trap exit).

τ₃: Instrument background scattered light (no specimen, light trap compensation port, white reference exit).

τ₄: Combined scattering of instrument + specimen (specimen entrance, light trap compensation, white reference exit).

Haze calculation formula:

H = [(τ₄ − τ₃ × (τ₂/τ₁)) / τ₂] × 100

Haze represents the ratio of diffuse scattered transmittance to total luminous transmittance.

Compensation port function: Compensates for integrating sphere efficiency changes caused by covered port areas, reducing cross-instrument deviation by ~8.9% compared to non-compensation port hazemeters and lowering measurement coefficient of variation from 13.6% to 9.3%

Specific Test Methods

Single-beam integrating sphere compensation method (no split procedures like ASTM D1003 A/B).

Core feature: Built-in compensation port to offset integrating sphere efficiency fluctuations caused by port coverage, drastically improving inter-laboratory measurement consistency.

Measurement logic: Four sequential light flux readings (τ₁, τ₂, τ₃, τ₄) with different combinations of specimen, white reference plaque and light trap on entrance, exit and compensation ports to isolate pure scattered light from instrument background scattering.

Applicable range: Haze <40%; materials with haze above 40% produce poor precision and are not recommended for this method.

Test Specimen Requirements

Source & cutting: Cut specimens from films, sheets, injection/compression-moulded transparent plastic parts.

Surface quality: Must be free of dust, grease, adhesive residue, scratches, blemishes, internal voids and foreign particles, unless testing defects as experimental variables.

Dimension: Fully cover the sphere entrance port; recommended 50 mm diameter disk or 50 mm square sheet.

Replication count: Minimum three identical specimens per material batch unless material specification specifies otherwise.

Thickness recording: Measure thickness at three separate positions per specimen and record average thickness in the test report.

Test Equipment Required for ISO 14782 Plastic Haze and Transmittance Test

Single-Beam Hazemeter with Integrating Sphere	UnitedTest Transmission and Haze testing machine can easily realize ASTM D1003 non compensating method, ISO 13468, ISO 14782 compensating method, full transmittance and haze testing. The open sample chamber can be tested vertically or horizontally to adapt to more tested samples.
Integrating sphere geometric	Entrance port and exit port centres separated by 3.14 ± 0.03 rad (180 ± 2°) arc. Exit port subtends 0.140 ± 0.002 rad (8 ± 0.1°) at sphere centre. Compensation port angle from entrance port <1.57 rad (90°); entrance, compensation ports and detector cannot share the same great circle. Unobstructed beam forms an annular gap around exit port subtending 0.023 ± 0.002 rad (1.3 ± 0.1°). Inner sphere wall, baffles and white reference tristimulus Y₁₀ reflectance ≥90%, variation ≤±3%.
Photodetector assembly	Mounted at 1.57 ± 0.26 rad (90 ± 15°) from entrance port, fitted with baffles to block direct sample light. Matches CIE 1931 10° standard colorimetric observer and CIE standard illuminants (per ISO/CIE 11664 series).
Specimen holder system	Fixes sample perpendicular to light beam within ±2°, positioned tightly against sphere entrance port to collect all scattered light. Flexible thin films: double-ring clamp, double-sided adhesive tape or vacuum plate to keep flat.
Light traps	For exit and compensation ports to fully absorb collimated beam when no specimen is mounted.

Mandatory Test Parameters and stipulation:

In-test ambient environment

Test apparatus must operate under identical 23 ± 2 °C / 50 ±10% RH controlled atmosphere.

Optical fixed parameters

Detector spectral matching: CIE 10° standard observer, CIE standard illuminants

Sphere geometric angular tolerances strictly follow the rad/degree limits listed in Clause 5 of ISO 14782:2021

Inner sphere reflectance threshold: ≥90% Y₁₀ value.

Defect control: Only retain defective specimens if quantifying haze contribution from surface/internal flaws; representative material testing requires flawless samples.

Abraded material limitation: Narrow-angle scattered light from scratched surfaces will underestimate true haze; alternative abrasion optical testing methods are required.

Instrument thermal stabilization: Power on the hazemeter and wait for full thermal equilibrium before taking measurements to avoid flux drift errors.

Standard Test Procedures ISO 14782 Plastic Haze and Transmittance Test:

Step 1: Specimen preparation and cleaning

Cut samples to 50 mm standard size, wipe surface contaminants, inspect for internal defects; prepare three replicates. Measure thickness at three points per specimen and calculate average thickness.

Step 2: Conditioning

Place all specimens in ISO 291 standard climate chamber for minimum 40 hours at 23±2 °C / 50±10% RH.

Step 3: Instrument warm-up and stabilization

Turn on hazemeter and maintain stable temperature until light source and detector reach thermal equilibrium.

Step 4: Four sequential flux measurements

τ₁: No specimen, white reference on compensation port, light trap on exit port

τ₂: Specimen mounted at entrance port, white reference compensation, light trap exit

τ₃: No specimen, light trap compensation port, white reference exit

τ₄: Specimen mounted at entrance port, light trap compensation, white reference exit

Step 5: Repeat measurement for all three replicate specimens.

Step 6: Haze result calculation

Compute haze percentage via the standard formula, average haze values of three replicates as final test result.

Industry Application Fields

ISO 14782 is the primary international haze test standard for global plastic manufacturing, covering these core sectors:

Flexible & rigid packaging: PET food films, cosmetic transparent containers, blister packs, pharmaceutical sterile transparent packaging

Automotive plastics: Headlight lenses, interior transparent panels, automotive window films, instrument cover sheets

Optoelectronics & displays: Touch screen substrates, display protective films, LED light transparent covers, optical filter sheets

Construction plastics: Polycarbonate window glazing, transparent PVC panels, anti-UV architectural clear sheets

Medical transparent plastics: IV fluid containers, transparent surgical device housings, disposable medical viewing panels

Consumer goods: Eyeglass blanks, plastic tableware, home appliance transparent panels, toy transparent components

Coatings & surface finishing: Clear hard coat performance evaluation on plastic substrates, post-aging haze assessment.

Related Standard:

ASTM D1003	Standard Test Method for Haze and Luminous Transmittance of Transparent Plastics Key differences: ASTM D1003 has two test procedures (hazemeter + spectrophotometer); ISO 14782 only single-beam compensation sphere method. D1003 upper haze limit =30%, ISO 14782 =40%; geometric port angles and calculation algorithms differ, so test results cannot be interchanged for certification or customer acceptance
GB/T 2410	Determination of light transmittance and haze of transparent plastics
UNI 8028	Transparent plastics sheets and films. Determination of the total luminous transmittance and haze.
ASTM D1044	Abrasion resistance test for transparent plastics (narrow-angle scattering measurement for scratched samples)
ASTM E2387	Goniometric Optical Scatter Measurements (for high-haze >30% diffusing plastics)
ISO 13468-1	Plastics – Total luminous transmittance of transparent materials
ISO 14782	Plastics – Haze measurement of transparent materials
JIS K 7136	Plastics -- Determination of haze for transparent materials

Keywords: UnitedTest ISO 14782 haze tester, ISO 14782 transparent plastic haze measurement machine, flat colourless plastic wide-angle light scattering test equipment, haze testing for substantially colourless transparent plastics, under 40% haze range optical analyzer, ISO 14782 plastic clarity inspection instrument, wide-angle light scattering haze test bench for plastic sheets

Transmission and Haze testing machine (General type) can easily realize ASTM D1003 non compensating method, ISO 13468 compensating method, full transmittance and haze testing. The open sample chamber can be tested vertically or horizontally to adapt to more tested samples.

Q1: What optical property does ISO 14782:2021 measure, and what is its valid measurement range?

A1: This standard exclusively measures haze, the wide-angle light scattering that reduces clarity of transparent, nearly colourless plastics. It is only reliable for materials with haze values below 40%. Plastics with haze above 40% produce poor precision and are not recommended for this method.

Q2: Is there more than one test procedure inside ISO 14782, similar to ASTM D1003 Procedure A and B?

A2: No. ISO 14782 defines only one unified single-beam integrating sphere compensation method. There is no separate spectrophotometer procedure like ASTM D1003 Procedure B. It relies on four sequential flux readings with a compensation port to correct instrument scattering errors.

Q3: Is ISO 14782 equivalent to ASTM D1003-21? Can test results be swapped for certification?

A3: They are not equivalent and results cannot be interchanged. Key differences:

ISO uses a compensation port design; ASTM D1003 uses non-compensated geometry.

ISO upper haze limit =40%; ASTM D1003 cutoff =30%.

Different sphere angular tolerances, calculation formulas and light collection logic.

Products certified for EU/global markets follow ISO 14782; North American specifications normally require ASTM D1003 data separately.

Q4: What is the core function of the compensation port required by ISO 14782 hazemeters?

A4: The compensation port offsets efficiency fluctuations of the integrating sphere caused by covering/uncovering ports during measurement. Lab trials confirm instruments without a compensation port read haze values 8.9% lower on average, with 2.2× higher measurement variability. The compensation port drastically improves inter-laboratory consistency and reduces coefficient of variation from 13.6% to 9.3%.

Q5: What size and quality rules apply to test specimens?

A5: Recommended dimension: 50 mm diameter disk or 50 mm square to fully cover the sphere entrance port.

Surfaces must be free of dust, grease, scratches, blemishes, internal voids and foreign particles unless intentionally testing defect-induced haze.

Prepare a minimum of three replicate specimens per material batch.

Measure thickness at three positions per specimen and record average thickness in the formal test report.

Q6: What reflectance standard must the integrating sphere inner wall meet?

A6: The tristimulus Y₁₀ value of the sphere interior, baffles and white reference plaque must be ≥90%, with maximum variation limited to ±3% to guarantee consistent light reflection inside the spherec.

Q7: Why must the hazemeter warm up and reach thermal equilibrium before measuring?

A7: Light source and photodetector output drift with temperature changes, which creates inconsistent flux readings and inaccurate haze percentages. The standard requires full thermal stabilization before starting the four-point measurement sequence.

Q8: When does measurement precision become limited under ISO 14782?

A8: For haze values below 1%, instrument detector sensitivity restricts precision, leading to larger relative deviation. For haze from 1% up to 40%, the method delivers acceptable repeatability and reproducibility across laboratories

Q9: How should thin flexible plastic films be mounted to avoid wrinkling errors?

A9: ISO 14782 recommends three valid mounting solutions: double-ring edge clamp, double-sided adhesive tape, or vacuum plate to hold films perfectly flat against the sphere entrance port. The specimen must sit perpendicular to the light beam within ±2° tolerance to capture all scattered light.

Q10: Why is ISO 14782 testing critical for transparent plastic manufacturers?

A10: Global cross-border trade compliance: It is the primary international haze standard accepted across EU, Asia, Australia and most global markets, mandatory for plastic procurement specifications for export products.

Superior inter-lab repeatability: The compensation port design minimises cross-factory measurement bias, enabling uniform quality grading across multinational supply chains.

Visual appearance quality control: Haze directly determines product clarity; high haze creates blurriness and veiling glare, critical for automotive glazing, medical viewing components and display screen covers.

R&D formulation troubleshooting: Haze data identifies scattering sources (resin impurities, micro-particles, uneven extrusion, incomplete coating curing) to optimise polymer recipes and production processes.

Durability and aging validation: Tracks haze increase after UV weathering, thermal cycling, chemical exposure or surface wear to predict product service life.

Contract acceptance evidence: Most international plastic purchase contracts reference ISO 14782 as the official haze test; standardized reports act as objective pass/fail batch evidence between suppliers and buyers.

Safety compliance verification: For medical, automotive and optical safety-critical transparent plastics, consistent low haze guarantees unobstructed vision and eliminates light-scattering visual hazards.

Q11: What do I do if my plastic material measures haze above 40%?

A11: ISO 14782 is not designed for highly diffusing materials over 40% haze. You need to adopt goniometric optical scatter measurement standards suitable for heavily diffusive transparent plastics.

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