HunterLab ColorFlex EZ Plastic Pellet Colorimeter

Overview

The HunterLab ColorFlex EZ Plastic Pellet Colorimeter is a benchtop spectrophotometric color measurement instrument engineered for high-precision, repeatable color evaluation of granular, powdered, and semi-solid materials—particularly plastic pellets used in polymer compounding, extrusion, and injection molding processes. Operating on the 45°/0° optical geometry, it replicates human visual perception under standardized illumination conditions, minimizing directional bias and enhancing correlation with visual assessment. The system employs a dual-beam pulsed xenon lamp with spectral output spanning 400–700 nm, delivering stable, flash-based illumination that eliminates thermal drift and ensures consistent spectral energy distribution across thousands of measurements. With a spectral resolution of 10 nm and optical bandwidth under 12 nm, the instrument meets the spectral fidelity requirements defined in CIE Publication 15:2018 and ISO 7724-2 for industrial colorimetry. Its compact, robust architecture and low-maintenance design make it suitable for integration into QC laboratories operating under ISO/IEC 17025, ASTM-compliant quality systems, or regulated environments requiring traceable, auditable color data.

Key Features

• 45°/0° optical configuration optimized for particulate and granular samples—enables direct top-down measurement of loose plastic pellets without compression or pelletizing, preserving native surface texture and scattering behavior.
• Large-format, high-resolution color LCD display supporting multi-language UI (English, Chinese, Spanish, Portuguese), enabling intuitive operation in multinational manufacturing facilities.
• Dual-aperture design: 31.8 mm port for 45°/0° measurements (standard for plastics and powders); optional 14.3 mm d/8° port for diffuse reflectance applications on flat or textured solids.
• Integrated QC software suite with pass/fail thresholding, statistical process control (SPC) charting, and real-time deviation alerts—supports automated compliance reporting against internal specifications or industry standards (e.g., ASTM D6290 for plastic color).
• USB 2.0 interface enables direct connection to PCs, external keyboards, or label printers—facilitating batch data export, firmware updates, and instrument calibration verification logs.
• Automatic sleep mode reduces power consumption during idle periods while maintaining calibration stability—critical for labs operating 24/7 shift schedules.
• Xenon lamp rated for >500,000 flashes ensures >5 years of typical QC usage without lamp replacement—minimizing downtime and consumable costs.

Sample Compatibility & Compliance

The ColorFlex EZ is validated for reflectance measurement of non-homogeneous, light-scattering samples including virgin and recycled plastic pellets (PP, PE, PET, ABS, PC), masterbatch concentrates, pigment dispersions, and ground polymer flakes. Its 45°/0° geometry suppresses gloss-related artifacts common in d/8° instruments when evaluating semi-crystalline or matte-surface pellets. The system complies with ASTM D2244 (calculation of color difference), ASTM D6290 (color measurement of plastic pellets), and ISO 7724-1 (instrumental colorimetry fundamentals). Data integrity is maintained per FDA 21 CFR Part 11 requirements when paired with HunterLab’s optional compliant software package, which provides electronic signatures, audit trails, and user-access controls. All calibrations are traceable to NIST-traceable ceramic standards, and routine verification follows ASTM E308 and ISO 13655 procedures.

Software & Data Management

The instrument ships with EasyMatch QC software, a Windows-based application supporting method-driven workflows, custom tolerancing (ellipsoidal ΔE*_cmc, rectangular L*a*b*), and automated report generation in PDF or CSV formats. Raw spectral data (10-nm intervals) is stored alongside metadata—including date/time stamp, operator ID, sample ID, illuminant/observer, and aperture selection—to support GLP/GMP documentation requirements. The internal memory retains up to 2,000 measurements with timestamp and statistical summary (mean, SD, min/max). USB export preserves full spectral files (.spc) compatible with third-party analysis tools (e.g., MATLAB, Python pandas) for advanced multivariate modeling or spectral library development.

Applications

• Color consistency verification of incoming plastic resin lots prior to extrusion or molding.
• In-process monitoring of color masterbatch dispersion efficiency in twin-screw compounding lines.
• Batch-to-batch release testing for medical-grade polymers where chromaticity must meet USP limits.
• Supplier qualification against OEM color specifications (e.g., automotive interior trim, consumer electronics housings).
• Development of color-stable formulations resistant to UV degradation or thermal yellowing (tracked via time-series Δb* and YI trends).
• Correlation studies between instrumental color values and visual grading using ISO 105-A02 gray scales.

FAQ

What sample preparation is required for plastic pellets?
No grinding, pressing, or dilution is needed. Pellets are poured directly into the 31.8 mm aperture cup; the instrument’s fixed-height geometry ensures consistent packing density and measurement repeatability.
Can the ColorFlex EZ measure translucent or opaque pellets?
Yes—it is specifically designed for both opaque and semi-translucent thermoplastic pellets. The 45°/0° geometry minimizes subsurface scattering effects that compromise accuracy in d/8° systems.
Is spectral data export supported for advanced analysis?
Yes. Full 400–700 nm spectra at 10-nm intervals can be exported in .spc format via USB for use in chemometric modeling or spectral database integration.
How often does the instrument require calibration verification?
Daily verification using the supplied white ceramic tile is recommended; full recalibration is typically performed quarterly or after physical impact, following ASTM D6530 guidelines.
Does the system support multiple user accounts with role-based access?
When operated with EasyMatch QC Enterprise edition, the instrument supports configurable user permissions, electronic signatures, and full 21 CFR Part 11 audit trails.