1) Appearance : white or off-white powder
2) pH value (5% in water solution ): 1.5-2.5
3) Loss on drying＜6%
4) Specific viscosity ( 1% in butanone solution ): 0.1-0.5/0.5-1.0/1.0-1.5/1.5-2.5/2.5-4.0
5) Heavy metals: ＜7ppm
6) Packaging: 20kg/fibre drum
7) HS code: 3907209090