ASTM D6290 Color Testing for Plastic Pellets
ASTM D6290-98e1 is intended for the instrumental measurement of the degree of yellowness (or change of degree of yellowness) under daylight illumination of homogeneous, nonfluorescent, nearly-colorless transparent, or nearly-white translucent or opaque plastics. The measurement is made on pellets and based on tristimulus values obtained with a spectrophotometer or colorimeter.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Overview
ASTM D6290-98e1 is a standardized test method used to determine the color of plastic pellets using instrumental color measurement techniques. It ensures consistent and objective evaluation of color properties, which are critical for maintaining product appearance and batch-to-batch uniformity in plastic materials.
This method is widely used in quality control and production environments to assess color consistency before processing. By quantifying color in numerical terms, it eliminates subjective visual variations and helps manufacturers maintain strict color specifications in plastic pellet production and downstream applications.
Scope, Applications, and Benefits
Scope
ASTM D6290-98e1 specifies procedures for measuring the color of plastic pellets using spectrophotometric methods under controlled conditions. It applies to virgin, recycled, and compounded plastic pellets and ensures repeatable and comparable color evaluation results.
Key scope elements include:
- Instrumental color measurement of plastic pellets
- Use of standardized illumination and viewing geometry
- Applicability to various polymer types and pellet forms
- Evaluation of color consistency and deviations
- Support for quality assurance and product specification compliance
Applications
- Plastic raw material quality control
- Batch-to-batch color consistency verification
- Masterbatch and compound validation
- Incoming material inspection
- Color matching and formulation development
- Automotive and consumer product plastics
- Packaging material evaluation
- Recycling material color assessment
Benefits
- Provides objective and precise color measurement
- Eliminates subjective visual color variation
- Ensures product consistency across batches
- Supports strict color specification compliance
- Enhances quality control efficiency
- Reduces rejection due to color mismatch
- Enables reliable color comparison and analysis
Test Process
Sample Preparation
Plastic pellets are cleaned and uniformly arranged to ensure consistent surface presentation for measurement.
1Instrument Calibration
Spectrophotometer is calibrated using standard references to ensure accurate color readings.
2Color Measurement
Pellets are measured under controlled lighting and geometry to capture precise color values.
3Data Analysis
Color parameters are calculated and compared against specifications or reference standards.
4Technical Specifications
| Parameter | Details |
|---|---|
| Material Type | Plastic pellets (virgin, recycled, compounded) |
| Method Type | Instrumental color measurement |
| Light Source | Standardized illumination |
| Geometry | Defined viewing/measurement geometry |
| Output Parameters | L*, a*, b*, ΔE values |
| Sample Form | Uniform pellet surface arrangement |
Instrumentation Used for Testing
- Spectrophotometer
- Colorimeter
- Calibration standards (white/black tiles)
- Sample holders or cups
- Controlled lighting system
- Computer/software for color analysis
Results and Deliverables
- L*, a*, b* color values
- Color difference (ΔE) values
- Comparison with reference standards
- Compliance with color specifications
- Detailed test report with measurement conditions
- Batch consistency evaluation
Why Choose Infinita Lab for ASTM D6290-98e1?
Infinita Lab is a leading provider of <Service-Name> and streamlined material testing services, addressing the critical challenges faced by emerging businesses and established enterprises. With access to a vast network of over 2,000+ accredited partner labs across the United States, Infinita Lab ensures rapid, accurate, and cost-effective testing solutions. The company’s unique value proposition includes comprehensive project management, confidentiality assurance, and seamless communication through a Single Point of Contact (SPOC) model. By eliminating inefficiencies in traditional material testing workflows, Infinita Lab accelerates research and development (R&D) processes.
Looking for a trusted partner to achieve your research goals? Schedule a meeting with us, send us a request, or call us at (888) 878-3090 to learn more about our services and how we can support you. Request a Quote
Frequently Asked Questions
ASTM D6290-98e1 ensures objective and consistent color measurement of plastic pellets using instrumental methods. It helps manufacturers maintain uniform appearance, meet customer specifications, and avoid subjective errors associated with visual color assessment during production and quality control processes.
Instrumental measurement eliminates human perception variability by quantifying color using numerical values. This ensures repeatable and precise results, enabling accurate comparison between batches and maintaining consistent color quality across different production lots and testing environments
Factors include lighting conditions, instrument calibration, sample preparation, and pellet surface characteristics. Controlling these variables ensures accurate and repeatable color measurements.
Challenges include achieving uniform sample presentation, minimizing surface reflection variations, and maintaining instrument calibration. Proper procedures help overcome these issues and ensure accurate results.
Standardized lighting ensures consistent measurement conditions. Different light sources can alter perceived color, so controlled illumination is essential for obtaining reliable and comparable results.
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