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Indo white – PWA Liquid

Application
Formulation
Special benefits
High affinity FWA for wet end and coating
 Cold resistant product

Neutral shade and low greening tendency particularly recommended for soft water suitables for mechanical and secondary fibers FWA for casein and Protein containing coating colours.

Indo white – PWA Liquid is a disulpho type fluorescent whitening agent (FWA) tailored to the specific needs of the paper industry.

Properties :

 
Appearance

Clear yellowish to yellowish brown liquid

Chemical constitution

Derivative of 4, 4' Diaminostilbene2, 2' disulphonic acid

Miscibility

Miscible with water in all properties

Solubility

30 g/l at 25oC

PH

9 -10

Density at 25oC

1.12 g/ml

Viscosity at 25oC

Max 50 mPa.s

Ionic character

Anionic

Active contents

16.0 % +- .5

Shade :

 

Indo white – PWA Liquid gives a neutral shade in all applications. It only has a tendency to produce a greenish hue if too large amounts are used.

Indo white – PWA Liquid in the wet end applications :

Indo white – PWA Liquid has outstanding affinity and is very effective in unsized papers. It is also noted for good affinity even with very soft water (<7 g.h or <70 ppm CaO). Largely unaffected by cationic substances. It can readily be used for papers sized with synthetic additives.

The product is particularly suitable for fluorescent whitening in acid sized loaded papers at a pH level of 4.8 – 6.5 and has considerable advantages over tetrasulpho products when used in amount of less than 0.6%.

Indo white – PWA Liquid can be dispensed intermittently at either the pulper or the mixing chest as liquid or as stock solution. It should always be added before the alum and never together with alum or other additives.

With its high affinity Indo white – PWA Liquid is the product of choice for continuous dosing, including at a point in the circuit where the stock is of low consistency.

Average dosage

0.05 – 2.0% at pH level above 5

 

0.05 – 1.0% at pH level below 4.8

Indo white – PWA Liquid at the size press application:

As stated above, Indo white – PWA Liquid is not the ideal product for size press application and we recommend using a indo white AB-Z type or a indo white AS type product.

Indo white – PWA Liquid in coating:

Excellent results can be obtained by applying Indo white – PWA Liquid in coating mixes based on casein or protein, as co-binders. The best effects are achieved with coating mix containing synthetic co-binders and latex. Indo white – PWA Liquid should not be used in coating compounds with starch as binder. For these applications we recommended using info white AS type or indo white BSU type product.

Average dosage  

0.1 -1.0% indo white PWA liquid based on the 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.