Specifications:
Fluorescent brightener ER-I
1) Chemical name: 4,4'-bis (2,2'-cyano-phenylene)-benzene
2) Index number: C.I.199
3) Molecular formula: C24H16N2
4) Molecular weight: 332
5) Appearance: greenish-yellow crystalline powder
6) Purity: ≥ 99.0%
7) Melting point: 229 - 231oC
8) Properties: strong fluorescence, high-whitening performance,
excellent fastness to sublimation

Fluorescent brightener ER-II
1) Chemical name: 4,4'-bis (2,4'-cyano-phenlene)-benzene
2) Index number: C.I.199:1
3) CAS number: 13001-38-2
4) Molecular formula: C24H16N2
5) Molecular weight: 332
6) Appearance: slight yellow powder
7) Purity: ≥ 99.0%
8) Melting point: 184 - 186oC
9) Properties: bluish color shade with strong fluorescence,
high-whitening performance, excellent fastness to sublimation