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Guide Offers Strategic Approach to Selecting OB and OB1 Brighteners
Oct 27,2026
In plastics, coatings and synthetic fiber production, the choice between fluorescent brightener OB and OB-1 can directly affect product appearance, processing stability and production cost. Although both are commonly grouped under the same whitening-agent label, their chemical structures and performance profiles are markedly different. A closer look at melting points, dispersion and heat resistance helps manufacturers make the right selection.
Core differences: performance and processing trade-offs
Fluorescent brightener OB (CAS: 7128-64-5) and OB-1 (CAS: 1533-45-5) are chemically distinct compounds, and that difference drives their behavior under different processing conditions.
| Comparison | Fluorescent brightener OB | Fluorescent brightener OB-1 |
|---|---|---|
| Melting point | 200°C | 360°C |
| Core advantage | Excellent dispersion and stability | Very high heat resistance |
| Recommended applications | High-end coatings, inks, flexible plastics | Polyester fiber, rigid PVC, ABS, PC |
| Cost competitiveness | Higher | Highly cost-effective |
Selection strategy: how to maximize cost efficiency
In practical production, selection should follow a simple principle: match performance to process needs, with cost as a priority. At present, raw-material supply fluctuations have pushed OB market prices significantly above OB-1, making OB-1 a core option for lowering production costs where process requirements allow.
Heat resistance is a key metric
With a melting point of 360°C, OB-1 is a leading choice for high-temperature plastic processing applications such as air-conditioner housings and kitchenware. For conventional polymerization processes such as polyester and nylon, OB-1 also demonstrates strong processing stability.
Dispersion and weather resistance
For high-end coatings or inks that demand a premium appearance, OB's superior dispersion remains difficult to replace. It helps prevent migration and later yellowing, helping products maintain a bright white appearance over time. In flexible plastics, OB also shows better stability than OB-1.
The bottom line
If current process conditions permit, prioritizing OB-1 can significantly reduce raw-material input. For customers with special appearance requirements, high-quality coating needs or specific flexible-plastic processing demands, continuing with OB is advised to ensure final-product performance stability. By precisely matching process requirements, manufacturers can control costs while keeping product quality at an industry-leading level.
