Shandong Zhongyang Chemical Co., Ltd.

Fluorescent Whitening Agent OB1 Yellow Type / Green Type

Release time:

2026-01-23

The Yellow Type and Green Type of Fluorescent Whitening Agent OB1 are essentially identical in terms of chemical structure, whitening efficiency, heat resistance (approx. 360°C), and weather resistance. The main differences lie in their color tone, appearance, manufacturing process, and intended application hues.

I. Key Differences

1. Color Tone Differences

Yellow-Tone OB-1: The color tone leans toward blue-violet; after whitening, it produces a warm white, natural white, or off-white appearance, with a visually softer whiteness.

Green-Tone OB-1: The color tone leans toward pure blue; after whitening, it produces a cool white, blue-white, or high-brightness white, better aligning with the Asian market’s aesthetic preference for “high whiteness and brightness.”

2. Appearance and Manufacturing Process

Yellow-phase powder has a slightly yellowish hue and is typically produced via an esterification process. It features high purity, minimal odor, and slightly higher costs.

Green-phase powder has a greenish hue and is typically produced via a sulfidation process. It offers high production volume and cost-effectiveness, making it the market mainstream.

3. Suitable Color Tones

Yellow-phase: Suitable for blending with yellow, red, and orange color families; less prone to turning blue or gray, resulting in more harmonious tones.

Green-phase: Ideal for pure white and extra-white products; offers superior whiteness and greater versatility.

II. How Customers Should Choose

1. Select Based on Whiteness Effect

For cool white, bright white, or blue-white: Choose Green-phase OB1 (the standard choice for over 90% of applications on the market).

For warm white, natural white, or a non-bluish tone: Choose Yellow-phase OB1.

2. Select by Cost and Production Volume

For high-volume production, cost-effectiveness, and general-purpose plastics: Prioritize Green-phase OB1.

For high-end applications, low odor, and stringent color matching requirements: Consider Yellow-phase OB1.

3. Select by Material and Application

Green-phase OB1: General-purpose high-white products such as PP, PE, ABS, PS, PVC, synthetic fibers, blown film, pipes, and injection molding.

Yellow-phase OB-1: PVC sheets, yellow/red color schemes, home appliance housings, and high-end products requiring a warm white tone.

4. Selection by Color System

When pairing with yellow, red, or brown: Prioritize the yellow-phase for a more unified overall hue.

For pure white or transparent whitening: Prioritize the green phase for more pronounced whiteness.

III. Recommended Addition Levels (Reference)

General plastic whitening: 0.01%–0.05%

High-whiteness requirements: 0.05%–0.1%

Synthetic fibers, films: 0.01%–0.03% (Specific levels should be determined by small-scale trials and machine testing to avoid excessive amounts causing a bluish or greenish tint.)

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