Most economical ideal FWA for size – press application on acid and neutral size paper to reaching high whiteness level. Outstanding performance in the presence of medium to high co-binder .Level works well in size press. Application reaching high whiteness levels

Indo white BSU liquid is a hexasulpho type fluorescent whitening agent (FWA) to be used exclusively for applications in surface coating and size press liquors. It imparts high to very whiteness and brightness to the treated paper.

Properties:

Exhaustion (10 – 30:1)

Light yellow to yellowish brown liquid

Diaminostibene disulphonic acid derivative

Can be mixed with water in all properties

9.0 – 11.0

1.12 + 0.05 g/ml

Viscosity at 25^oC

Lower than 75mPa.s (D=10S-4)

Anionic

16.0% + 1.0

Shade :

Indo white BSU liquid gives a slightly reddish white in surface sizing and surface coating application. It can be added upto 30 gpl in size press liquor.

Indo white BSU liquid at the size press application :

Indo white BSU liquid performs well with the conventional starch qualities used at the size press. It can be used together with CMC, PVA and anionic and slightly cationic synthetic sizing additives. Its effectiveness is not influenced by the pH of the base paper. It is preferable to add Indo white BSU liquid undiluted to the ready prepared size press liquor.

Average dosage

2.0 – 4.0 g/l indo white

Indo white BSU liquid in coating :

Indo white BSU liquid can be used to produce high and very high white coated papers.

FWA's of the diaminostilbene disulphonic acid derivative class have adequate affinity for coating pigments and synthetic binders based on copolymers of acrylic acid ester and butadiene styrene. Carriers known as co-binders are therefore essential in amounts of about 1.0% if the best effects ie. Highest whiteness, are to be achieved with Indo white BSU liquid. Suitable carriers in order of their effectiveness are PVA, CMC, starch and synthetic co – binders.

For coating mixes with a low co-binder content, we recommend Indo white BSU liquid. The best effects of Indo white BSU liquid are obtained with the following amounts of co-binders, based on solid content:

PVA

1.2 parts

CMC

1.2 parts

6.0 parts

0.4 parts

The FWA can be added, preferably undiluted, at almost any stage during preparation of the coating compound. Indo white BSU liquid can be added undiluted at almost any stage in the preparation of coating compounds .

0.2 – 4.0 parts based

On the coating pigment

The information and recommendations contained in this data sheet are to be the best of our knowledge correct, but no guarantee is given in this respect and no responsibility can be accepted for the results obtained.