Delta E

testing

A standardized measurement of color difference that quantifies how much one color differs from another, expressed as a single numerical value using the CIE color space system.

In Simple Terms

Delta E is like a ruler for color differences - it gives you a number that tells you exactly how far apart two colors are. In plastics, it helps determine if a batch matches the target color specification or if color variation is acceptable.

Why It Matters

Color consistency is critical in plastic products for brand recognition and customer acceptance. Delta E provides objective measurements for quality control, helps establish acceptance criteria, and enables consistent communication about color differences between suppliers and customers.

Technical Details

Delta E is calculated using CIE Lab color space coordinates, with values typically ranging from 0 (identical colors) to 100+. Values under 1.0 are barely perceptible, 1-3 are noticeable to trained observers, 3-6 are clearly visible, and above 6 represent significant color differences requiring correction.

Real-World Examples

ABS resin color matching

A customer requires Delta E <2.0 between production batches of red ABS pellets to ensure consistent appearance in automotive interior parts.

Masterbatch lot acceptance

Quality control measures Delta E between incoming blue masterbatch lots and the approved standard, rejecting any lots with Delta E >3.0.

Recycled content verification

Post-consumer recycled HDPE shows Delta E of 4.5 compared to virgin material, requiring additional colorant to meet packaging specifications.