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Direction for Use［POVAL (PVOH)］

1.Preparation for Aqueous Solution

Preparation for Aqueous Solution fig

Fully Hydrolyzed Type

Add room temperature water while stirring and heat with steam to within a range of 90°C to 95°C. The compllete omplete solution can be obtained in 30 min to 60 min. By keeping the material in water for 20 min to 30 min to allow swelling prior to heating, the material can be dissolved even more quickly and uniformly even more.

Partially Hydrolyzed Type

Add room temperature water while stirring and make sure the granules are evenly distributed. After they are sufficiently distributed, heat to within a range of 80°C to 90°C for 30 min to 60 min until the granules are completely dissolved.

-Remarks-

  • On charging POVAL, charge it in water quickly and stir to avoid making lumps.
  • Keep the outlet of drainage clear by avoiding dead spots where resins would be easily deposited.
  • POVAL is a crystalline polymer, so as far as possible, heat to within a range of 90°C to 95°C to completely dissolve the crystallized portions. (Dissolving at a low temperature makes it easy for gelatinization to occur.)
  • As POVAL tends to be membranous (filmy), keep stirring until the temperature decreases to 50°C.
  • POVAL foams more or less in the process of solution. The partially hydrolyzed type is especially liable to foam. Be careful not to overheat and not to let air mix in the solution. If foaming continues, add an antifoaming agent.
  • A particular grade including an optimum defoamer is also available in the lineup of J POVAL.

2.Storage of Solution

  • For fully hydrolyzed types, the higher the concentration and the lower the temperature, the greater the increase in viscosity during storage, which sometimes results in the formation of a gel. This gelatinization is due to the crystallization of POVAL, so heating it will return it to its original aqueous solution state. After an aqueous solution has been prepared, use it as quickly as possible after preparation or dilute it before storing it.
  • Partially hydrolyzed types are very stable.
  • POVAL solution itself does not become moldy, but sometimes the nourishment in the solution water or sodium acetate produces mold. An anti-mold agent is recommended for long-term storage.

3.Handling Precautions

First Aid

If it gets in the eyesWash out the eyes in the same manner as when general objects get in the eyes.
If it gets on the skinWash off with water if either the powder or an aqueous solution gets on the skin.
If it is inhaledIt is desirable to gargle and breathe fresh air.
If it is swallowedDrink warm water and induce vomiting.

Measures to Take During a Fire

Extinguishing methodApply water or a powdered extinguishing agent in the same manner as for a general fire.
Fire extinguishing agentsWater, powdered extinguishing agent, carbon dioxide gas extinguishing agent

Measures to Take if There is a Leak or Spill

PowderSweep it up and place it in a container. If it cannot be used, combust it in the same manner as regular trash. If water gets on it, it will turn into a paste and be very slippery, caution is advised.
Liquid solutionIf there is much liquid, collect it into a container. If it becomes mixed with the drain water, perform active sludge processing on it before flushing it into the drain system.

Handling and Storage Measures

Handling
  1. The material includes fine powder, therefore some dust will be stirred up when it is placed in the dissolving tank. It is best if rubber gloves and protective glasses are worn to protect the skin and the eyes.
  2. When handling it in large quantities, install a dust collector. In addition, there is a danger that a spark from static electricity could set off a powder explosion. IT is necessary to take appropriate measures, such as making sure everything is well grounded and use non-conductive materials.*
    *note:non-conductive materials would be rubber shoes and wheels, etc.
Storage
  1. The powder dissolves in water, threfore store it where rain water and other water will not get on it.
  2. The powder can absorb humidity and form a block, threfore avoid storing it in high humidity, high temperature areas.
  3. Storing more than 3,000 kg is subject to the Fire Service Law Specified Flammable Substances regulations.

additional information is recorded on the Material Safety Data Sheet (MSDS).
To request the MSDS, contact one of the following offices.

[Sales & Marketing Department]
Yusen Awajicho Building 2nd Floor,
4-1, Kanda-Awajicho, 1-Chome, Chiyoda-ku, Tokyo 101-0063, Japan
Telephone: 81-3-6853-5630 Facsimile: 81-3-6853-5633
E-mail: sds@j-vp.co.jp

POVAL (PVOH)