Specialty PVOH
General PVOH
| Product Grade | Saponification Degree (mol%) | Viscosity *1 (mPa.s) | pH*2 | Volatile Matter (%) |
|---|---|---|---|---|
| N-300 | 98.0-99.0 | 25.0-30.0 | 5.0-7.0 | Max 5.0 |
| NL-05 | Min 98.5 | 4.0-6.0 | 5.0-7.0 | Max 5.0 |
| AL-06R | 91.0-94.0 | 6.2-7.0 | 5.0-7.0 | Max 5.0 |
*2: 4% aqueous solution
| Product Grade | Saponification Degree (mol%) | Viscosity *1 (mPa.s) | pH*2 | Volatile Matter (%) |
|---|---|---|---|---|
| GH-23 | 86.5-89.0 | 48.0-56.0 | 5.0-7.0 | Max 5.0 |
| GH-22 | 86.5-89.0 | 45.0-52.0 | 5.0-7.0 | Max 5.0 |
| GH-20R | 86.5-89.0 | 40.0-46.0 | 5.0-7.0 | Max 5.0 |
| GH-17R | 86.5-89.0 | 27.0-33.0 | 5.0-7.0 | Max 5.0 |
| GH-14R | 86.5-89.0 | 20.5-24.5 | 5.0-7.0 | Max 5.0 |
| GL-05 | 86.5-89.0 | 4.8-5.8 | 5.0-7.0 | Max 5.0 |
| GL-03 | 86.5-89.0 | 3.0-3.7 | 5.0-7.0 | Max 5.0 |
*2: 4% aqueous solution
Properties
Processing & Handling
Storage
Since this is a fine powder, user rubber globes, dust masks, protective eyewear and other protective gear when when handing it in order to protect skin and eyes. When handling large amounts of it, install dust collection equipment. In addition, since there is danger of dust explosions occurring from ignition caused by static electricity sparks, use grounding equipment and conductive dust filtration cloth and take other countermeasures. Store in a place where it will not be dampened by rain, for example, because it could dissolve. Moreover, because it can easily harden into blocks if it absorbs moisture, avoid storing it in hot and humid conditions.
Dissolving
Suggestions for Agitation
Careful attention must be paid to the temperature of water to avoid undissolved powder lumps. Strongly agitate to avoid GOHSENOL™ particles settling at the bottom of the vessel.
Representative dissolution methods suitable for each type of GOHSENOL™ are as follows:
N and A type GOHSENOL™
Charge GOHSENOL into room temperature water under agitation. After finishing the charge, begin to raise the temperature to 90-95 degree C. Keep at this temperature for 30-60 minutes under continued agitation until it has completely dissolved.
G type GOHSENOL™
Slowly charge GOHSENOL™ into room temperature water under agitation. Begin to raise the temperature to 80-90 degree C. After having fully dispersed GOHSENOL™ keep at this temperature for 30-60 under continued agitation until it has completely dissolved. Be careful to avoid any rapid temperature increase, as this often causes severe foaming.
K type GOHSENOL™
Slowly charge GOHSENOL™ into room temperature water under agitation. Begin to raise the temperature to 70-75 degree C. After having fully dispersed GOHSENOL™, keep at this temperature for 30-60 under continued agitation until it has completely dissolved. Pay full attention to the temperature as dissolving time is significantly increased above 80 degree C. Sometimes turbidity due to the Clouding point is observed at 70-75 degree C. But this turbidity disappears after it has cooled. Be careful to avoid any rapid temperature increase, as this often causes severe foaming.
