Factor measurement method of Potassium Polyvinyl Sulfate Titration
itration Solution (N/400)
and declaration of the incorporated changes

Dear Sirs:
We would like to take this opportunity to express our thanks for your continued support. In the past,
we received support from your patronage, for which we are very grateful.
Regarding the colloid titration reagent that you regularly use, we have decided to terminate theexisting product for the reasons explained below, to introduce a new factor determination method,
and to release a new product.
We appreciate your understanding and cooperation and kindly request you to use the new productin the future.
We will continue to strive to achieve product evaluation and quality control with the best advancing
technology. Thanks again for your guidance.

［previous product］
Code No.

Product Name

Grade

Potassium Polyvinyl Sulfate Titration

for Colloidal

Solution (N/400)

Tritration

Code No.

Product Name

Grade

167-28105

N/400 PVSK Solution

164-21655↓［new product］

for Colloidal
Titration

Package Size
500mL

Package Size
500mL

[Progress of changes and reasons]In the colloid titration method, Potassium Polyvinyl Sulfate Titration Solution is the reagent used
as a reference. Recently, a decision has been taken by us for employing traceability based oninternational units (SI) to assure an internationally consistent measurement of values. In
accordance with this endeavor, we performed repeated studies to quantify the Potassium Polyvinyl
Sulfate Titration Solution. With cooperation from the National Institute of Advanced Industrial
Science and Technology (AIST), we succeeded in developing a value-setting method adhering to theSI system. In the future, we intend to supply Potassium Polyvinyl Sulfate Titration Solution using a
traceable evaluation expressed in SI units.

1. Changes in the measurement method[Value-setting method for the previous product]
To date, the PVSK Titration Solution and the Gch Titration Solution were used for mutual value
setting.
In addition, these titrants were not SI traceable.

[Value-setting method for the new product]
The PVSK Titration Solution is valued using CPC, which is itself valued at AIST and retroactively
changes to a measurement method adhering to the SI unit system.

PVSK: Potassium Polyvinyl Sulfate / CPC: Hexadecylpyridinium Chloride
Gch: Glycol Chitosan / MGch: Methyl Glycol Chitosan
DADMAC: Poly(diallyldimethylammonium Chloride)2. Related products
Along with the modification of the factor value measurement method of the PVSK titrant, therelated product will be changed as follows:［previous product］
Code No.

Product Name

Grade

164-21655

Potassium Polycvinyl Sulfate Titration Solution(N/400)

072-05045

Glycol Chitosan Titration Sokution(N/200)

137-14655

Methyl Glycol Chitosan Titration Solution(N/200)

161-14695

0.0025N Poly(diallyldimethylammonium Chloride)

500mL

For

500mL

ColloidalTritration↓［new product］

Package Size

Grade500mL
500mL

Code No.

Product Name

Package Size

167-28105

N/400 PVSK Solution

077-06715

N/200 Gch Solution

For Colloidal

500mL

139-18875

N/200 MeGch Solution

Tritration

500mL

042-34455

N/400 DADMAC Solution

500mL

500mL

* The sale of each bulk powder will be terminated. Please use each titration solution in the futureaccording to our recommendations.
[Previous products] Sale of the following products will be discontinued:
Code No.

Product Name

162-03071

Potassium Polycvinyl Sulfate072-01581

Glycol Chitosan

134-04731

Methyl Glycol Chitosan

Grade
For Colloidal
Tritration

Package Size
10g10g10g[Regarding dates of selling previous and new products]
We plan to launch the new product after June, 2018. The previous product is scheduled to be soldtill the end of December, 2018, until stocks last. The previous product and the new product will
be parallelly sold for 6 months.
3. Contact information
FUJIFILM Wako Pure Chemical Corporation
TEL: 81-6-6203-3741
FAX: 81-6-6203-3359
Email: ffwk-cservice@fujifilm.com

4. Reference information[The impact on each product]
Regarding the impact on each product resulting from this modification, the measured analysis
examples are as follows:[Impact on the ion equivalent value of the polymer coagulant][Impact on the chitosan deacetylation degree (DAC)]

The abovementioned section contains reference information. There is no guarantee of similar results
for all products.