Low-Methanol Kuraray Poval ™
Technical Data Sheet
Methanol ≤ 0,1 wt% (product made in Japan)
GradenameKuraray
Poval™
1)
2)
3)

22-88 LV

Viscosity 1)[mPa•s]Degree ofhydrolysis[mol%]

Methanol 2)
content [%]Ash 3)
content[%]

20.5-24.5

87.0-89.0

≤ 0,1

≤ 0.4

pH
5.0-7.0

Of a 4% aqueous solution at 20 °C DIN 53015 / JIS K 6726
Kuraray method by HS-GC
calculated as Na2O

Methanol ≤ 0,3 wt% (product made in Germany)
Viscosity 1)[mPa•s]Degree ofhydrolysis[mol%]

Methanol 2)
content [%]Ash 3)
content[%]

4-88 LV

3.5-4.5

87.0-89.0

≤ 0,3

≤ 0.4

5.0-7.0

26-88 LV

24.5-27.5

87.0-89.0

≤ 0,3

≤ 0.4

5.0-7.040-88 LV

38.0-42.0

87.0-89.0

≤ 0,3

≤ 0.4

5.0-7.049-88 LV

45.0-52.0

87.0-89.0

≤ 0,3

≤ 0.4

5.0-7.0

GradenameKuraray
Poval™

1)
2)
3)

pH

Of a 4% aqueous solution at 20 °C DIN 53015 / JIS K 6726
Kuraray method by HS-GC
calculated as Na2O-Statement to prove absence of following substances will be available. TSE/BSE,
heavy metals, conflict minerals, GMO, etc-

Specically for the products made in Germany (methanol ≤ 0.3 %) we would be able
to achieve GMP for cosmetic in 2019 following the guide from EFfCI if it creates
additional value in the market

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Technical Data Sheet
Processing
Preparation of Kuraray Poval ™ solutions, general procedure
Kuraray Poval™ is usually processed as an aqueous solution. The solution should be prepared incorrosion resistant vessels. As a first step Kuraray Poval™ is sprinkled into cold water during
stirring and heated to 90 - 95 °C in a water bath or by the use of live steam. The solution should
be stirred during cooling in order to prevent skin formation. The speed of dissolution increases
with increasing temperature. The speed of dissolution decreases with increased molecular weight(increased viscosity of the aqueous solution). The dissolving process is also made more difficult
when there is a transition to higher concentrations. As a result even a more highly concentrated
Kuraray Poval™ solution, e.g. a 30 % solution of Kuraray Poval™ 4-88, should be produced attemperatures of 90 -95 °C.
Polyvinyl alcohol solutions may produce foam when stirred or during transport in pipelines, but
this can be largely prevented by using a suitable stirrer design such as a low-speed anchor stirrer
or by avoiding steep downward gradients in the pipelines.
Suitable defoamers are n-octanol, tributyl phosphate, Foamaster® 223 and the Agitan® grades
301, 305 and 731, which are used in quantities of up to approx. 0.001 - 0.010 % relative to thesolution. Polyvinyl alcohol solutions which have been stored for lengthy periods may increase inviscosity. This is especially true of fully saponified grades in high concentrations and at low
temperatures. The original viscosity can be restored by heating and stirring.

Preservation
Like any other polyvinyl alcohol, Kuraray Poval™ in the form of an aqueous solution can beattacked by microorganisms under certain conditions. In the acidic pH range the main organisms
reproduced are the fission fungi, whilst bacteria grow most readily in a neutral to weakly alkaline
medium. The solution can be preserved from any microorganism attack by adding a preservative.
Products which have proved especially suitable for the purpose are for example the Mergal®
grades K9N and K14. The dosage depends on the concentration of the solution, the storage
temperature and the nature and intensity of the infection. Quantities of about 0.01 - 0.2 % byweight preservative, relative to the Kuraray Poval™ solution, are generally sufficient.
Compatibility and efficiency must be tested. Information on the quantity to be used is available
from the suppliers.
It is advisable for the Kuraray Poval™ solution to be prepared and stored in clean containers.
Considering the resistance that may be shown by some microorganisms to the preservatives
employed, the dissolving vessel in particular, together with the filling equipment (pipes, valves,tubing etc.), needs to be kept clean. Any skins or incrustations should be removed. In the eventof complications the possibility of changing to a different preservative must be considered.

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us toLow-Methanol Kuraray Poval ™
Technical Data Sheet
Certain applications for Kuraray Poval™ in solution (cosmetic preparations, finger paints etc.)
require the preservatives employed to be of approved types and physiologically inert. In such
instances it is essential for the relevant legal regulations regarding physiological effects to betaken into account.

Storage
Kuraray Poval™ resin can be stored for an unlimited period of time under appropriate conditions
that is in its original packs in closed, dry rooms, at room temperature. Kuraray would recommendthat our product is used within 12 months from the shipment date as given on the certificate ofanalysis.

GeneralIndustrial Safety and Environmental Protection
Not classified as a dangerous substance or preparation according to the current criteria ofchemical legislation, or of the EU Directives 67/548/EC. A safety data sheet is available on
request.

Special remarks
Not classified as a dangerous substance or preparation according to the current criteria ofchemical legislation, or of the EU Directives 67/548/EC. A safety data sheet is available on
request.

Refer to the Kuraray Poval ™ webpage for regulatory
information

Kuraray Europe GmbH
Philipp-Reis-Str. 465795 Hattersheim am Main
Germany
Phone: +49 69 305 85351
Web: https://www.kuraray-poval.com/
pva@kuraray.com

Version: 01.02.2024