Optical brighteners also called fluorescent whitening agents (FWAs) are hydrophilic water-soluble compounds used in laundry detergents.
Testing items |
Standards |
---|---|
Appearance |
Greenish-yellow color micro granular materials |
Molecular Weight |
562.6 g/mol |
Odor |
No peculiar smell |
pH value |
7-8 |
Moisture |
≤5% |
Solubility at 70℃ |
Clear |
Melting Point |
>300°C (dec.) |
Density |
1.414g/cm3 (25 ℃) in standard state (at 25 ℃[77 °F], 100 kPa) |
Water solubility |
25 g L−1 at 25 °C |