What Is Whiteness Index?
Direct Answer
Whiteness index measures a material's natural whiteness without fluorescent brighteners, letting manufacturers achieve bright white without chemical additives.
Key Takeaways
- Whiteness index measures a material's natural whiteness without fluorescent brighteners, letting manufacturers achieve bright white without chemical additives.
- How it works: Whiteness index quantifies how white a material appears based on its reflectance profile.
- Natural whiteness in pulp products is measured by whiteness index
- Myth: Whiter means brighteners. High whiteness index can be achieved naturally
How Whiteness Index Works
Whiteness index quantifies how white a material appears based on its reflectance profile. High natural whiteness comes from fiber quality and processing, avoiding the need for fluorescent brighteners (which are restricted for migration in hygiene products). Testing verifies that whiteness is natural, not brightener-added.
Examples and Applications
- Natural whiteness in pulp products is measured by whiteness index
- Manufacturers optimize processing to reach high whiteness without brighteners
Whiteness Index vs. Related Terms
| Term | What it is | Key difference |
|---|---|---|
| Fluorescent brightener | Whiteness Index | Brighteners artificially boost whiteness via UV conversion; whiteness index measures natural whiteness |
Limitations and Common Misconceptions
- Myth: Whiter means brighteners. High whiteness index can be achieved naturally
- Myth: Whiteness affects function. It is a cosmetic property, not absorbency
What is whiteness index?
A measure of a material's natural whiteness — high values without brighteners indicate good fiber processing.
Why avoid brighteners?
Migrating fluorescent brighteners are restricted in hygiene products; natural whiteness avoids them.
References
- GB 15979-2024 一次性使用卫生用品卫生要求 (Hygienic requirements for disposable sanitary products) — 国家标准 (accessed 2026-08-02)
- JP CIA (industry) - Baby diaper material: key components and their functions — 行业媒体 (accessed 2026-08-02)