Selvol™ Polyvinyl Alcohol Product Information
Manufacturers commonly use Selvol polyvinyl alcohol (PVOH) for adhesives. However, the industry and agriculture sectors also use it in emulsion polymerization, films and packaging, as well as in oil field cementing, paper, textiles, ceramics and seed coatings.
As a top PVOH supplier, we continually develop new applications and products featuring PVOH.
Manufacturers make Selvol PVOH from vinyl acetate monomer (VAM) via a multistep process. They polymerize VAM into polyvinyl acetate and then convert it to PVOH. Read more about Selvol polyvinyl alcohol here.
Grades
The grades of Selvol PVOH offer incredible versatility in one product. In fact, it’s the most versatile PVOH product we offer. The key to working with Selvol PVOH is finding the grade that suits your needs.
Standard Grades
Each Selvol PVOH grade varies in molecular weight and degree of hydrolysis.
We generally express molecular weight in terms of solution viscosity. The viscosities are classified as ultra low, low, medium and high. Degree of hydrolysis is commonly denoted as super, fully, intermediately and partially hydrolyzed. We offer a wide range of standard grades.
In addition to SEKISUI Specialty Chemicals’ standard product line, we provide multiple specialty grades. These include polymerization, fine particle size and tackified PVOHs:
- Selvol PVOHs 805, 823 and 840 are improved versions of our standard polymerization grades (Selvol PVOHs 205, 523 and 540, respectively). These products offer many advantages in emulsion polymerization applications, including better water solubility and lower foaming.
- Selvol PVOH S-grades are similar to the standard grades. However, they have a fine particle size so that more than 99% of the product passes through a U.S.S. 80-mesh screen. These grades are available commercially as Selvol PVOHs 203S, 205S, 523S and 540S.
- Tackified Selvol PVOHs are products of the controlled boration of super-hydrolyzed and fully hydrolyzed grades. These borated alcohols yield viscous, aqueous solutions. Moreover, these solutions have a tailored degree of tack and significantly reduce penetration when applied to surfaces such as paper.
Selvol Polyvinyl Alcohol Solutions
SEKISUI Specialty Chemicals provides premade solutions of some of our standard grades. A Selvol PVOH solution eliminates the dissolution step and creates a number of advantages:
- Ready-to-use, improved solution consistency
- Lower energy costs
- Lower processing costs (no cooking required)
Selvol PVOH solutions are available only in the U.S.
Selvol polyvinyl alcohol grades have many characteristics that make them useful in a wide range of applications.
By choosing from the many available Selvol PVOH grades, you can obtain the performance properties needed for your specific applications. These include properties such as water solubility, abrasion resistance, tensile strength, adhesive and bonding properties, grease or oil resistance and film-forming qualities.
Our highly skilled technical service group can help you select your ideal Selvol PVOH grade.
Changes Occurring in the Properties of PVOH as the Degree of Hydrolysis and Molecular Weight Change
Viscosity/Concentration Relationships of Aqueous Selvol Polyvinyl Alcohol Solutions at 20%
Selvol Polyvinyl Alcohol Molecular Weight
| Viscosity | Viscosity Type | Degree of Polymerization | Average Molecular Weight Range |
|---|---|---|---|
| 3-4 cps | Ultra Low | 150-300 | 13,000-23,000 |
| 5-6 cps | Low | 350-650 | 31,000-50,000 |
| 22-30 cps | Medium | 1000-1500 | 85,000-124,000 |
| 45-72 cps | High | 1600-2200 | 146,000-186,000 |
Physical Properties
Selvol PVOH combines high tensile strength with ease of film formation. Additionally, Selvol PVOH resins show outstanding adhesive and bonding characteristics. Partially hydrolyzed grades adhere better to hydrophobic surfaces.
Furthermore, the degree of hydrolysis affects the water sensitivity of both the resin and film. Water resistance increases as hydrolysis increases. You should use the super-hydrolyzed grades when you need maximum water resistance and humidity resistance.
Greases, petroleum hydrocarbons and animal or vegetable oils generally do not affect Selvol PVOH resins. Resistance to organic solvents also increases with the degree of hydrolysis. When necessary, one can plasticize Selvol PVOH film with glycerol or lower molecular weight glycols. These materials usually act as humectants to hold water in the film.
Physical Properties of PVOH
| Appearance | White-to-cream granular powder |
| Bulk Density | 40 lbs per cu ft |
| Specific Gravity — of solid — of 10 wt % solid at 25°C | 1.27 – 1.311.02 |
| Thermal Stability | Gradual discoloration at about 100°C, rapid darkening above 150°C and rapid decomposition above 200°C |
| Thermal Conductivity, W/(m•K)3 | 0.2 |
| Electrical Resistivity, ohm•cm | (3.1 – 3.8) x 107 |
| Specific Heat, J/(g•K)b | 1.5 |
| Melting Point (unplasticized), °C | 230 for fully hydrolyzed grades and 180-190 for partially hydrolyzed grades |
| Tg, °C (dry film) | 75-85 |
| Storage Stability (solid) | Indefinite when protected from moisture |
| Flammability | Burns similarly to paper |
| Stability to Sunlight | Excellent |
Notes
a. To convert W/(m•K) to (Btu•in)/(h•ft2•F), divide by 0.1441.
b. To convert J to cal, divide by 4.184.
Chemical Reactions
PVOH resins react in a manner similar to other secondary polyhydric alcohols. One can carry out PVOH’s esterification reactions with a number of compounds. A commercially important reaction is the formation of tackified PVOH using boric acid or borax to form cyclic esters. This reaction is very sensitive to pH, and an insoluble gel forms above 4.5-5.0.
Other esterification reactions include the following:
- Those with chloroformate esters to yield polyvinyl carbonate
- Those with urea to yield a polymeric carbamate ester
- Those with isocyanates to form substituted carbamate esters
Another commercially important reaction is acetalization with aldehydes. The reaction of PVOH with butyraldehyde produces polyvinyl butyral, which manufacturers use in the production of inner adhesive film for safety glass. One can use its reaction with dialdehydes, such as glyoxal or gluteraldehyde, to crosslink PVOH.
Other reactions include ethoxylation, propoxylation and cyanoethylation.
Packaging and Storage
Selvol PVOH products are available in multiple packages:
- Granular/powder product in 25 KG, 500 KG and 1000 KG
- Solutions product in 450-LB drums and 2250-LB tote
- Other potential packaging
For more information, please contact us.
Typical Properties for Selvol PVOH Products
| Selvol PVOH Grade | Viscosity | % Hydrolysis | % Ash, Max |
| Super Hydrolyzed | |||
|---|---|---|---|
| 125 | 28.0-32.0 | 99.3+ | 1.20 |
| 165 | 62.0-72.0 | 99.3+ | 1.20 |
| Fully Hydrolyzed | |||
| 103 | 3.5-4.5 | 98.0-98.8 | 1.20 |
| 107 | 5.5-6.5 | 98.0-98.8 | 1.20 |
| 310 | 9.0-11.0 | 98.0-98.8 | 1.20 |
| 325 | 28.0-32.0 | 98.0-98.8 | 1.20 |
| 325LA | 28.0-32.0 | 98.0-98.8 | 0.60 |
| 350 | 62.0-72.0 | 98.0-98.8 | 1.20 |
| Intermediately Hydrolyzed | |||
| 418 | 14.5-19.5 | 91.0-93.0 | 0.90 |
| 425 | 27.0-31.0 | 95.5-96.5 | 0.90 |
| 443 | 53.0-63.0 | 92.0-94.0 | 0.90 |
| Partially Hydrolyzed | |||
| 502 | 3.0-3.7 | 87.0-89.0 | 0.90 |
| 203 | 3.5-4.5 | 87.0-89.0 | 0.90 |
| 504 | 4.0-5.0 | 87.0-89.0 | 0.70 |
| 205 | 5.2-6.2 | 87.0-89.0 | 0.70 |
| 513 | 13.0-15.0 | 87.0-89.0 | 0.70 |
| 518 | 17.5-20.5 | 87.0-89.0 | 0.70 |
| 523 | 23.0-27.0 | 87.0-89.0 | 0.50 |
| 540 | 45.0-55.0 | 87.0-89.0 | 0.50 |
| Fine Particles (S-Grade) | |||
| 165SF | 62.0-72.0 | 99.3+ | 1.20 |
| 203S | 3.0-3.7 | 87.0-89.0 | 0.90 |
| 205S | 3.5-4.5 | 87.0-89.0 | 0.70 |
| 513S | 13.0-15.0 | 87.0-89.0 | 0.70 |
| 523S | 23.0-27.0 | 87.0-89.0 | 0.50 |
| 540S | 45.0-55.0 | 87.0-89.0 | 0.50 |
| Specialty – Polymerization | |||
| 805 | 5.2-6.2 | 87.0-89.0 | 0.70 |
| 818 | 17.0-21.0 | 87.0-89.0 | 0.70 |
| 823 | 23.0-27.0 | 87.0-89.0 | 0.50 |
| 830 | 29.0-35.0 | 87.0-89.0 | 0.50 |
| 840 | 45.0-55.0 | 87.0-89.0 | 0.50 |
| Specialty – Textile | |||
| WS-724 | 13.0-24.0 | 91.0-95.5 | 1.20 |
| WS-53NF | 18.5-29.0 | 86.0-90.0 | 1.20 |
| Specialty – Tackified | |||
| PH | Viscosity | Viscosity | |
| MM51 | 4.4-4.9 | 1100-1500 | 1100-1500 |
| MM81 | 4.4-4.9 | 1300-1700 | 1300-1700 |
| MH82 | 4.4-4.9 | 4200-5900 | 4200-5900 |
| Selvol PVOH Solutions | |||
| Solution | Base Grade | % Solids | Viscosity |
| 08-125 | 125 | 7.0-8.0 | 100-1300 |
| 15-103 | 103 | 14.5-15.5 | 50-500 |
| 09-325 | 325 | 8.0-9.0 | 200-1300 |
| 09-523 | 523 | 8.5-9.5 | 250-1300 |
| 05-540 | 540 | 4.75-5.25 | 50-300 |
| 21-205 | 205 | 20.0-22.0 | 800-1300 |
| 24-203 | 203 | 23.0-25.0 | 250-1300 |
Solution Preparation
For most applications, you must dissolve Selvol PVOHs in water before use. While S-grades may be more cold water-processable under the right conditions, one must cook all other grades.
We recommend first dispersing Selvol PVOHs in cold or room-temperature water using sufficient agitation to wet out all particles. As a general rule, ensure the surface of the water is moving vigorously.
Addition rates, solids and cook-out temperatures vary by PVOH grade, as we illustrate below. For the best results, do not exceed maximum solids. Raise the solution’s temperature to recommended levels (185-205°F/85-96°C), and then hold for 30 minutes.
Selvol PVOHs are in solution after cooking, and one can use them at any temperature.
Although the cooking process is straightforward, please be aware of the following pitfalls:
- All tanks and lines must be free of borax to avoid coagulation.
- Tanks should have baffles and flush bottom valves to avoid dead spots where PVOH can agglomerate.
- Failing to reach the minimum temperature results in undissolved PVOH, no matter how long one cooks it.
- One cannot overcook Selvol PVOHs. However, boiling induces foam.
- Avoid high-speed, small-diameter mixers. These agitators do not provide adequate mixing and tend to entrain air.
- If one uses a defoamer, it’s best to add the defoamer before adding the PVOH to the water. A defoamer is unnecessary with Selvol PVOHs 805, 823 and 840.
- If one keeps solutions for more than 24 hours, we recommend adding a biocide.
- One can jet-cook Selvol PVOHs. Unlike starch, which explodes in a steam jet, Selvol PVOHs dissolve by shedding layers. Maximizing time in the jet and providing a holding tank for the PVOH solution after the jet (where one can hold solutions for a minimum of 15 minutes) ensure complete solubility.
| Selvol PVOH Grade | Addition Rate | Maximum Recommended Solids | Minimum Cook-Out Temperature |
|---|---|---|---|
| 103 | 10 sec/bag | 30% | 200°F (93°C) |
| 107 | 10 sec/bag | 20% | 200°F (93°C) |
| 310 | 10 sec/bag | 15% | 200°F (93°C) |
| 125 | 10 sec/bag | 10% | 200°F (93°C) |
| 325 | 10 sec/bag | 10% | 200°F (93°C) |
| 165 | 10 sec/bag | 7% | 200°F (93°C) |
| 350 | 10 sec/bag | 7% | 200°F (93°C) |
| WS-724 | 1 min/bag | 15% | 195°F (91°C) |
| WS-53NF | 1 min/bag | 10% | 185°F (85°C) |
| 418 | 1 min/bag | 12% | 195°F (91°C) |
| 425 | 1 min/bag | 10% | 195°F (91°C) |
| 443 | 1 min/bag | 7% | 195°F (91°C) |
| 203 | 2 min/bag | 30% | 185°F (85°C) |
| 502 | 2 min/bag | 30% | 185°F (85°C) |
| 205 | 2 min/bag | 20% | 185°F (85°C) |
| 805 | 2 min/bag | 20% | 185°F (85°C) |
| 513 | 2 min/bag | 15% | 185°F (85°C) |
| 523 | 2 min/bag | 10% | 185°F (85°C) |
| 823 | 2 min/bag | 10% | 185°F (85°C) |
| 540 | 2 min/bag | 7% | 185°F (85°C) |
| 840 | 2 min/bag | 7% | 185°F (85°C) |
| 504 | 2 min/bag | 30% | 185°F (85°C) |
| 518 | 2 min/bag | 15% | 185°F (85°C) |
| Recommended Additives for PVOH* | |||
| Type | Brand or Generic Name | Manufacturer | Suggested Use Level |
|---|---|---|---|
| Crosslinkers | Bacote-20 Glyoxal Polycup 172 |
Magnesium Elektron, Ltd. BASF Ashland |
2 – 10% d/d 5 – 15% d/d 5 – 10% d/d |
| Defoamers | Antifoam 116 Industrol DF 132 |
Harcros BASF |
< 1% d/d < 1% d/d |
| Biocides | Kathon LX Dowicil 75 |
Dow Chemical Dow Chemical |
< 50 ppm 1000-2000 ppm |
| Plasticizers | Glycerin Ethylene glycol Urea |
— — |
2-5% 2-5% 1-5% |
Note*
One should verify the FDA compliance status of the recommended additive with its manufacturer.
Please refer to your material safety data sheets (MSDS) for information on the safe use and handling of Selvol polyvinyl alcohol, including toxicity, fire and explosion hazards, and environmental effects. You can access an MSDS online.
SEKISUI Specialty Chemicals has an intimate human contact (IHC) policy in effect. This IHC policy restricts the use of Selvol PVOH in applications involving ingestion or contact with human mucous membranes.
Please contact us for more information.
FDA Compliance
Manufacturers use PVOH in many food contact applications, including food packaging adhesives and paper or paperboard coatings. For more specific information on the FDA status of any of our grades, please contact our Technical Services.
Selvol PVOH Right To Know Information
| Ingredient | CAS Number |
|---|---|
| Polyvinyl Alcohol | |
| — Super and Fully Hydrolyzed | 9002-89-5 |
| — Partially and Intermediately Hydrolyzed | 25213-24-5 |
| Water | 7732-18-5 |
| Methanol | 67-56-1 |
| Sodium Acetate | 127-09-3 |
Product Availability
Selvol PVOH standard and specialty grades are available globally. SEKISUI Specialty Chemicals supports sales with an in-region, worldwide workforce. Contact us for more information.
Selvol E PVOH
The Selvol E PVOH line has a wide variety of grades to meet your needs. Overall, Selvol E PVOH comprises standard grades, which we denote by their degree of hydrolysis: fully, intermediately or partially. We manufacture the Selvol E PVOH product line in Tarragona, Spain, and the line primarily supports the European market.
Please access the product literature page to download technical data sheets.
See the chart below for typical properties and applications.
| Selvol PVOH Grade | Viscosity | % Hydrolysis | % Ash, Max |
| Fully Hydrolyzed | |||
|---|---|---|---|
| E103 | 3.5-4.5 | 98.0-98.8 | 1.2 |
| E305 | 4.5-5.5 | 98.0-98.8 | 1.2 |
| E107 | 5.5-6.6 | 98.0-98.8 | 1.2 |
| E310 | 9.0-11.0 | 98.0-98.8 | 1.2 |
| E325 | 28.0-32.0 | 98.0-98.8 | 1.2 |
| Partially Hydrolyzed | |||
| E203 | 3.5-4.5 | 87.0-89.0 | 0.9 |
| E04 / 88LA | 4.0-5.0 | 87.0-89.0 | 0.9 |
| E05 / 88LA | 5.0-6.0 | 87.0-89.0 | 0.7 |
| E205 | 5.2-6.2 | 87.0-89.0 | 0.7 |
| E08/88 | 7.0-9.0 | 87.0-89.0 | 0.7 |
| E523 | 23.0-27.0 | 87.0-89.0 | 0.5 |
| Fine Particle (S-Grade) | |||
| E203S | 3.5-4.5 | 87.0-89.0 | 0.9 |
| E205S | 5.2-6.2 | 87.0-89.0 | 0.7 |
| E523S | 23.0-27.0 | 87.0-89.0 | 0.5 |
| Selvol E PVOH Applications | E 103 | E 305 | E 107 | E 310 | E 325 | E 203 | E 04 / 88LA | E 05 / 88LA | E 205 | E 08 / 88 | E 523 |
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