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        # Achieving the Perfect White: The Magic of Optical Brighteners

        

**Topic:** Technical

        

Your 'white' PVC products look slightly yellow or dull next to the competition. No matter how much TiO2 you add, that premium 'blue-white' glow is missing.

        
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## Problem

Titanium Dioxide provides opacity, but it can't always overcome the inherent yellowish tint of PVC resins and recycled materials. Adding more TiO2 is expensive and can affect the physical properties of the compound.

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## Likely cause

This issue often stems from inconsistent compounding temperatures, inferior raw material purity, or unbalanced stabilizer ratios within the formulation matrix.

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## Corrective direction

NBT Optical Brighteners (OB/OB-1) work by absorbing UV light and re-emitting it in the blue spectrum. This masks the yellow tint and creates a brilliant, high-end white finish. You only need a tiny amount (0.01-0.05 PHR) to achieve a massive visual difference.

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          ## Frequently Asked Questions

          
### Will the brightening effect fade over time?

High-quality brighteners like NBT OB-1 are designed for long-term stability, though UV exposure will eventually degrade them.

### Is it safe for food packaging?

Specific grades are approved; always check the technical datasheet for compliance.

        
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By NBT Technical Desk · Updated 2026-06-07

        

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