| HS Code | 156531 |
| Appearance | Clear, viscous liquid |
| Color | Colorless to pale yellow |
| Odor | Mild, characteristic |
| Ph | 6.0 - 8.0 |
| Solid Content | 25.0 - 27.0 wt% |
| Viscosity | 2500 - 5000 mPa·s at 25°C |
| Specific Gravity | 1.05 - 1.10 at 25°C |
| Density | 8.8 - 9.2 lb/gal |
| Boiling Point | 100°C (212°F) |
| Freezing Point | 0°C (32°F) |
| Flash Point | > 93°C (closed cup) |
| Solubility In Water | Fully miscible |
| Voc Content | 0% by weight |
As an accredited SELVOL Polyvinyl Alcohol 08-125 Solution factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged in 55-gallon drums, SELVOL Polyvinyl Alcohol 08-125 Solution provides a consistent, ready-to-use aqueous PVA formulation for industrial applications. |
| Container Loading (20′ FCL) | 20′ FCL container loaded with SELVOL Polyvinyl Alcohol 08-125 Solution, secured in drums/IBCs, properly labeled for safe liquid chemical transport. |
| Shipping | SELVOL Polyvinyl Alcohol 08-125 Solution ships in clean, sealed drums or totes designed for aqueous polymer solutions. Protect from freezing and excessive heat to maintain stability. It is not typically regulated as hazardous under DOT/IMO, but require proper labeling, spill-containment procedures, and accompanying safety data sheets to ensure safe transport and handling. |
| Storage | Store in tightly sealed original containers in a cool, dry, well-ventilated area away from direct sunlight and incompatible materials. Protect from freezing and excessive heat, as temperature extremes can affect solution stability. Keep containers upright to prevent leakage and contamination. Always follow manufacturer guidelines and use within the stated shelf life. |
| Shelf Life | SELVOL Polyvinyl Alcohol 08-125 solution typically has a shelf life of 6–12 months when stored properly, protected from freezing and contamination. |
On a 6.2 m wide fourdrinier fine paper machine producing basis weights from 70 g/m² to 120 g/m² at 1,150 m/min, SELVOL Polyvinyl Alcohol 08-125 Solution is introduced at the size press after in-line dilution to 9.0–12.0% solids with condensate at 45–55°C. The 4% aqueous solution viscosity measured per ISO 1652 falls between 8.0 mPa·s and 10.0 mPa·s at 20°C, while the 87–89 mol% hydrolysis range provides cold-water solubility without the insolubles that appear in fully hydrolysed grades below 40°C. At the flooded nip, the circulating size liquor is passed through a 100 µm pressure screen and fed to a twin-roll film press with rod pressure of 1.0–2.5 bar.
Dry pick resistance and linting tendency on offset grades are evaluated with an IGT AIC2-5T2000 surface strength tester using medium-viscosity oil; paper sized with a 20:80 PVOH/starch blend shows higher dry pick velocity than a starch-only control when size press pickup is held between 1.5 g/m² and 2.2 g/m² per side. The short-chain PVOH also reduces size film brittleness when post-drying infrared bars are run above 70°C and web moisture content drops below 5.0%. Internal sizing response is monitored by Hercules Size Test per TAPPI T 530; values above 20 s at 50% reflectance indicate adequate holdout for further conversion.
The operational boundary is set by borate contamination. Sodium tetraborate from recycled broke can crosslink the 1,3-diol units of partially hydrolysed PVOH, raising Brookfield viscosity at 50°C above 250 mPa·s and producing gel deposits behind the metering rod. For this reason, incoming starch slurries are screened for boron and size press pH is maintained at 6.5–8.0. Cobb values measured per TAPPI T 441 after 60 s are normally maintained at 22–28 g/m² when the PVOH solution replaces 10–20% of oxidized starch on a dry basis.
When vinyl acetate monomer is polymerized in a 20 m³ glass-lined batch reactor equipped with a two-flight retreat-blade impeller running at 45 rpm, the PVOH solution is pre-charged into the aqueous phase at 3.0–6.0 parts per hundred parts monomer before initiation. The low molecular weight distribution of 08-125, reflected in the 4% solution viscosity of 8.0–10.0 mPa·s at 20°C, produces lower final emulsion viscosity than medium-molecular-weight protective colloids at the same 55% solids. The reactor is heated to 65°C before a redox initiation system is started; the exotherm is controlled by a reflux condenser and staged monomer addition so that batch temperature does not exceed 82°C.
Above 85°C, grafting of PVOH to poly(vinyl acetate) increases low-shear viscosity and can create microgel that plugs 200 µm bag filters. The emulsion is cooled to 25°C and adjusted to pH 4.5–6.5 with sodium bicarbonate; final Brookfield viscosity at 25°C, measured with an RVT spindle 6 at 20 rpm, is generally accepted within a 2,500–8,000 mPa·s window. Particle size distribution is monitored by laser diffraction per ISO 22412; PVAc homopolymers stabilized with 08-125 typically show a D₅₀ between 1.0 µm and 3.0 µm with a span below 1.6.
Dried film redispersibility is tested by casting a 200 µm wet film on glass, conditioning at 23°C and 50% RH for 24 h, then immersing in deionized water at 25°C under 500 rpm magnetic stirring. A redispersion time below 15 min indicates acceptable hydrophilic colloidal protection. For wood adhesive formulations, the emulsion is compounded with 8–12 wt% plasticizer and 2–4 wt% propylene carbonate coalescent; pot life at 40°C should exceed 72 h before viscosity drift beyond ±20% is observed. Freeze-thaw stability is checked across three cycles from −10°C to 25°C; a viscosity increase below 200% indicates stable colloidal protection.
Microporous inkjet receptive layers on photo-grade base stock are slot-die coated at 150–400 m/min with a wet coating weight of 35–70 g/m². SELVOL Polyvinyl Alcohol 08-125 Solution is compounded with fumed silica at a silica-to-PVOH dry ratio from 3:1 to 5:1; the low-shear viscosity of the coating colour at 25°C is held below 200 mPa·s at 10 s⁻¹ and below 50 mPa·s at 300 s⁻¹ using an Anton Paar MCR 302 rheometer with a 50 mm cone-plate geometry. The short-chain grade reduces the area of fracture at the die lip; slot gap is set at 180–250 µm, and the web is dried in a three-zone air flotation dryer with zone temperatures of 50°C, 80°C, and 95°C.
If the final moisture content leaves the dryer above 5.5%, blocking on the take-up reel is observed. Gloss at 75° per TAPPI T 480 can be increased to 30–50% by on-line calendering at 80°C and 120 N/mm. Dye bleed is tested with a 1:1 water/isopropanol drip test and a 24 h water immersion panel; the 08-125 layer itself is not waterfast, so a cationic top coat is required if wet-rub resistance is part of the specification.
Remoistenable envelope adhesives exhibit a narrow process window between blocking resistance and re-wet speed. For gumming on 80–120 g/m² envelope and postal paper, the solution is blended with dextrin or PEO carrier at 10–25% PVOH solids on total binder and applied by a roller coater at 10–20 g/m² dry weight. The low viscosity of 08-125 allows uniform transfer at gravure roll speeds of 150–300 m/min without stringing. After drying at 60–70°C, the adhesive film must be non-blocking at 40°C and 60% RH under 70 g/cm² stack pressure for 24 h.
Re-wet speed is evaluated by applying a 20–50 µm water film from a felt roller and measuring initial tack with a probe tester per ASTM D2979 through the water layer. Open time, defined as the interval between water application and loss of tack, is extended by incorporating 4–10 wt% glycerol on dry PVOH; above 12 wt% glycerol, the film becomes tacky at 55% RH and blocks during summer storage. T-peel adhesion to paper after 3 s rewetting, measured in a fixture adapted from ASTM D1876, should exceed 0.15 N/mm before fibre tear occurs.
High-speed air-jet looms impose severe abrasion on warps above 950 rpm, requiring a size film that neither fibrillates at the reed nor migrates into the yarn core. SELVOL Polyvinyl Alcohol 08-125 Solution is applied in a size box at 5.0–8.0% solids with squeeze roll pressure of 2.0–3.5 bar; size add-on after drying is controlled to 8–12% on yarn weight. Yarn hairiness is measured with an Uster Zweigle HL 400 at 500 m/min, and the reduction in S3 hairiness values should be 30–50% compared with unsized yarn.
Tensile elongation at break retained above 4.5% per ASTM D2256 prevents breakage during shed formation. Drying cylinders are set to 120–140°C with a final moisture regain of 4.0–6.0%; overdrying below 3.0% causes the PVOH film to become brittle and increases warp stops. Desizing is carried out in 80°C deionized water at pH 8–9 for 15 min, and removal is verified by iodine staining; residual binder below 0.2% avoids dye uptake variation in subsequent finishing.
In a 50 kg aqueous alumina slip batch, 08-125 solution is added at 4.0–8.0 wt% based on alumina powder, together with 0.5–1.5 wt% polyethylene glycol as plasticizer. The binder must maintain slip viscosity below 2,500 mPa·s at 50 s⁻¹ while producing green tensile strength above 1.5 MPa after drying. The slip is degassed under 50–80 mbar vacuum for 20 min and cast through a doctor blade gap of 300–600 µm onto a polyethylene terephthalate carrier at 0.5–2.0 m/min.
After a two-stage drying step at 25°C and 60% RH for 4 h, then 45°C and 20% RH for 2 h, green sheets are inspected for edge lift and cracking. Green tensile strength and elongation are measured per ISO 527-3 on 0.2 mm strip specimens; values below 1.5 MPa are rejected for lamination. The low molecular weight of 08-125 reduces slip ageing: viscosity drift over 48 h at 25°C should remain below 15%. Binder burnout is conducted in air to 450°C at 1°C/min; residual carbon below 0.05% is required to prevent dielectric loss in the fired ceramic.
Temporary protective films for stainless steel forming operations require controlled peel force and complete water-removability. A 12–15% solids solution of 08-125 is cast at 250 µm wet film thickness onto the metal surface and dried at 60°C for 10 min. The resulting continuous film is peeled at 0.5–2.0 N/25 mm as measured by ASTM D6862-11; a higher peel force above 5 N/25 mm indicates insufficient release and requires 2–5 wt% glycerol plasticizer. Direct solar exposure for more than 30 days embrittles the PVOH and should be avoided unless a UV-stabilised topcoat is applied.
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An aqueous preparation of SELVOL Polyvinyl Alcohol 08-125 Solution is supplied for manufacturing operations where a low-viscosity, partially hydrolyzed polyvinyl alcohol is required without dry-powder handling. The underlying resin is characterized by a Brookfield viscosity of 5.2–6.2 mPa·s measured on a 4% aqueous solution at 20 °C and an alcoholysis degree of 87.0–89.0 mol%. These figures place the product between cold-water-soluble, low-viscosity PVOH grades and fully hydrolyzed, hot-water-processed grades. Unlike fully hydrolyzed PVOH, the 08-125 resin retains sufficient residual acetate to limit interchain hydrogen bonding; unlike higher-viscosity partially hydrolyzed grades, its short chain length keeps viscosity low enough for high-solids transfer and high-speed coating applications.
Specific solution properties depend on the solids concentration declared on the certificate of analysis. The dry precursor is typically controlled to an ash content of ≤0.5% as Na2O, a pH of 4.5–6.5 in aqueous systems, and a volatile content of ≤5.0%. The solution may contain a biocide or stabilizer; these additives affect long-term viscosity and color stability. Before dilution in demineralized water, the solution temperature should be equilibrated to 20–25 °C to avoid local gels and to maintain uniform viscosity from batch to batch.
| Property | Typical resin value | Measurement condition |
|---|---|---|
| Brookfield viscosity | 5.2–6.2 mPa·s | 4% aqueous solution, 20 °C, ISO 2555 |
| Alcoholysis degree | 87.0–89.0 mol% | Titrimetric method |
| pH | 4.5–6.5 | 20 °C, glass electrode, ASTM E70 |
| Ash as Na2O | ≤0.5% | Resin combustion method |
| Volatile content, dry precursor | ≤5.0% | Oven loss method |
At 87.0–89.0 mol% alcoholysis, the residual acetate units interrupt crystallite packing and allow rapid dissolution at ambient temperature. In fully hydrolyzed grades with 98.0–98.8 mol% hydrolysis, the regular hydroxyl sequence permits strong interchain hydrogen bonding, so complete solubilization typically requires heating above 70 °C and high-shear mixing. The practical consequence is that 08-125 solution can be diluted in ambient water without the 70–90 °C cook stage required for fully hydrolyzed resin. However, the same acetate content reduces the intrinsic water resistance of the dried film. Wet tensile strength is therefore lower than that of fully hydrolyzed PVOH unless a crosslinker or a fully hydrolyzed blending partner is introduced.
A comparison of dry-film performance illustrates the trade-off. At 50% relative humidity and 23 °C, a cast film of 08-125 can exhibit higher elongation and lower tensile strength than a fully hydrolyzed grade of similar viscosity. The lower crystallinity also produces lower oxygen barrier but better adhesion to polar substrates. In applications such as temporary protective films or water-soluble packaging components, the low-crystallinity, low-viscosity combination is often selected to balance solubility and surface wetting. Published data for this specific solution formulation is limited, so film property comparisons should be confirmed with cast samples according to ASTM D882-18.
| Operating criterion | 08-125 solution class | Fully hydrolyzed PVOH | Higher-viscosity partially hydrolyzed PVOH |
|---|---|---|---|
| 4% resin viscosity at 20 °C | 5.2–6.2 mPa·s | Grade-dependent; may range from low to high viscosity | 20–30 mPa·s typical industrial class |
| Alcoholysis degree | 87.0–89.0 mol% | 98.0–98.8 mol% | 87.0–89.0 mol% |
| Cold-water dissolution | Rapid at 20 °C | Requires heating above 70 °C | Rapid but higher solution viscosity |
| Dry-film water resistance | Limited without crosslinking | High | Moderate |
| Typical function | Low-viscosity film former, protective colloid | Water-resistant barrier film | High-strength sizing, emulsification |
In weaving preparation, warp yarns require a film former that resists abrasion during shedding and reduces yarn hairiness. On high-speed sectional warpers operating at 600–1,200 m/min, low solution viscosity is necessary to maintain constant add-on at squeeze pressures of 20–40 kN/m. Because the 4% viscosity of the 08-125 resin is 5.2–6.2 mPa·s, a final size bath at 8–12% solids may remain below 200 mPa·s, reducing size-box foaming and roller slinging. The partially hydrolyzed backbone also provides surface activity that improves wetting of hydrophobic polyester blends. Tensile retention of sized yarn can be evaluated according to ASTM D2256, but published field data for this specific solution concentration is limited; machine trials should validate add-on uniformity at the target speed.
Compared with starch- or dextrin-only formulations, the 08-125 solution contributes more film flexibility and improved adhesion to synthetic yarns. However, it is not a drop-in replacement for high-viscosity PVOH grades in sized-yarn strength development. Blending with starch ethers or polyacrylates may be required to maintain shedding resistance at high loom speeds. In production trials, a common bottleneck has been viscosity drift in the size box when dilution water enters at low temperature; automatic viscosity control by metering the pre-dissolved 08-125 solution is preferred over dry feeding of granular resin.
In paper surface sizing and remoistenable adhesive applications, the low-viscosity character offers similar handling advantages. Rod-metered size presses operating at 200–800 m/min can apply 2–6% dry solids without excessive misting or blade chatter. The partially hydrolyzed structure provides film flexibility but limited water resistance; therefore, applications requiring structural permanence in water generally require crosslinking or blending with a fully hydrolyzed grade. Cobb water absorption of sized paper may be monitored according to ISO 535 to confirm that surface sizing has not degraded the sheet absorbency beyond specification.
Viscosity of the supplied 08-125 solution is strongly concentration- and temperature-dependent. At 4% solids, the resin viscosity is 5.2–6.2 mPa·s, but at 20% solids and 20 °C, apparent viscosity may exceed 1,000–3,000 mPa·s depending on shear rate and preservative or co-solvent content. Non-Newtonian shear thinning is not pronounced at low concentrations but may appear at high solids due to chain entanglement. The solution is typically pseudoplastic in concentrated form, so rotational viscometer readings at a single spindle speed should not be extrapolated to shear rates encountered in die coating or roll transfer without a flow curve.
Dilution in low-shear side-entry agitated tanks below 100 rpm can leave insufficient dispersion. A rotor-stator or high-shear mixer at 1,500–3,000 rpm is typical for initial dilution under controlled temperature. Process temperature should be maintained between 15 °C and 40 °C during dilution to avoid local gel formation and to reduce microbial growth. Filtration through 100–200 µm stainless-steel mesh is recommended downstream of the dilution vessel to remove skins and agglomerates that can block slot-die lips or roller coating gaps.
For emulsion polymerization of vinyl acetate and vinyl acetate ethylene dispersions, the 08-125 solution may serve as a protective colloid. The pre-solubilized form eliminates dry-resin wetting time and reduces dust exposure in reactor charging. Typical addition levels may range from 1–4% of total monomer mass, although the optimum depends on desired particle size distribution and latex viscosity. The low molecular weight reduces reactor side-wall fouling compared with medium-viscosity grades, but high-ionic-strength formulations above 0.5 M salt may require a secondary protective colloid or a higher-viscosity PVOH grade. Published data for this specific solution configuration is limited; dispersion stability should be confirmed by pilot polymerisation before scale-up.
Addition of borate ions to aqueous PVOH produces diol complexation and can form strong gels. The 08-125 solution also responds to borate, but because of its lower molecular weight and higher residual acetate content, gelation typically occurs at higher borate-to-PVOH ratios or lower solution solids than medium-viscosity partially hydrolyzed grades. In one production-scale issue, a pH-controlled borate crosslinker feed at pH 8.5–9.0 led to local gel particles when the 08-125 solution was injected at 15% solids without sufficient in-line dilution; pre-diluting to 6% solids before crosslinker addition resolved the gel-particle formation. Alkaline conditions above pH 9.5 may accelerate ester hydrolysis and reduce molecular weight during prolonged heating above 40 °C. Acidic conditions below pH 3.5 can promote acetal formation with aldehydes and reduce solubility.
Transition-metal salts such as ferric chloride, titanium complexes, or dichromate-based additives can interact with hydroxyl groups and cause discoloration or viscosity instability. The 08-125 solution is generally compatible with nonionic surfactants and many starch ethers, but high concentrations of sulfate salts can salt out the polyvinyl alcohol. Solvent compatibility should be checked before addition of alcohols or ketones; ethanol or isopropanol above 30–40% of the continuous phase may induce clouding or precipitation depending on solution solids and temperature.
Storage in unheated tanks below 5 °C may increase viscosity and encourage surface skinning; storage above 35 °C without preservative may lead to microbial growth and pH drift. A closed stainless-steel or lined steel tank with low-shear recirculation at 10–20 rpm is adequate for short-term holding. Long residence times at pH 4.5–6.5 are generally stable, but preservative systems must be validated because the solution is a nutrient-rich aqueous medium. Regulatory status of the solution should be confirmed with the current safety data sheet; end-use suitability for food-contact applications must be verified against the manufacturer’s current food-contact statement and applicable regional requirements such as FDA 21 CFR 175.300.
