C.I. number: 199
Appearance: slight yellow liquid
Ionic character: nonionic
PH value: 5 - 7
Active content: ≥ 20%
Property: mainly used in whitening of polyester fabric and its blends with strong fluorescence, high whitening performance, good fastness to light, wash and excellent fastness to sublimation.
Process:
1.  Pad-thermos fixing process
ER-I  2-3g/l (should be adjusted according to the sample testing), procedure:
pad(two dips and two squeezes, residual liquor content 70%) → dry(100 ºC )→ cure(180-200 ºC , 30-20s)
Attention:
•  the goods must be rinsed thoroughly after pretreatment to ensure the PH below 8
•  the PH of the pad liquor should be adjusted to 4-5 with acetic acid
2. HT exhausting process
ER-I 0.2-0.3%(o.w.f.) liquor ratio 1:10 -30
Treating temperature 120-130 ºC treating time 30-60min
PH 5-10(5-7 is specially recommended)

It needs to be declared that the above data is based on our present knowledge and experience; owing to too many affecting factors, these data cannot be free from their check and test when processing and using the product.