| HS Code | 453241 |
| Product Name | SELVOL Polyvinyl Alcohol 830 |
| Appearance | White to off-white granular powder |
| Degree Of Hydrolysis | 98.8 - 99.4% |
| Viscosity 4 Solution At 20c | 3.2 - 4.0 mPa·s |
| Molecular Weight | Approximately 10,000 - 20,000 g/mol |
| Ph 4 Solution | 5.0 - 7.0 |
| Ash Content Max | 0.5% |
| Volatile Content Max | 5.0% |
| Bulk Density | 400 - 600 kg/m³ |
| Specific Gravity | 1.25 - 1.30 |
| Melting Point | 180 - 230°C |
| Film Refractive Index | 1.50 |
| Solubility In Water | Soluble in hot water |
As an accredited SELVOL Polyvinyl Alcohol 830 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | SELVOL Polyvinyl Alcohol 830 is supplied in 25 kg multi-wall paper bags with a polyethylene liner for moisture protection. |
| Container Loading (20′ FCL) | 20' FCL container loaded with SELVOL Polyvinyl Alcohol 830 in sealed bags on pallets, safely secured and weight-optimized. |
| Shipping | SELVOL Polyvinyl Alcohol 830 ships as a non-hazardous solid powder in sealed bags, palletized and wrapped to prevent moisture absorption. Keep dry, away from ignition sources, and store in a cool, ventilated area. Avoid dust generation; use grounded equipment and proper PPE during handling. |
| Storage | Store SELVOL Polyvinyl Alcohol 830 in a cool, dry, well-ventilated area, away from moisture, direct sunlight, heat, and ignition sources. Keep containers tightly closed when not in use to prevent caking and contamination. Avoid dust accumulation and static discharge. Maintain adequate ventilation and ensure compatibility with local regulations. Use within recommended shelf life for optimal performance. |
| Shelf Life | Shelf life: 2 years from date of manufacture when stored in original, unopened container under dry, cool conditions. |
Water-soluble unit-dose packaging built from partially hydrolysed polyvinyl alcohol requires a dissolution profile that remains dimensionally stable at 60–65% relative humidity during cartoning yet releases the charge within 30–60 s in a 20°C wash cycle. SELVOL Polyvinyl Alcohol 830, a low-viscosity partially hydrolysed grade with nominal hydrolysis of 87–89 mol% and Brookfield viscosity of 3.5–4.5 mPa·s measured on a 4% aqueous solution at 20°C, is blended with higher-viscosity PVOH grades in cast film systems to lower solution viscosity and speed dissolution without reducing machine-direction toughness. The film formulation for detergent pod stock uses 68–80 wt% PVOH resin solids, 10–16 wt% glycerol, 3–8 wt% sorbitol, 0–10 wt% starch, and 0.1–0.5 wt% sodium lauryl sulfate; SELVOL 830 occupies 15–35 wt% of the total PVOH resin blend. Mechanical lot release is anchored to ASTM D882-18 tensile testing at 23°C and 50% RH, with typical machine-direction tensile strength between 25 MPa and 35 MPa and Elmendorf tear by ASTM D1922-09 between 200 gf and 600 gf. For the finished unit-dose article, regulatory compliance falls under Regulation (EC) No 648/2004 for detergents, and the polymer is assessed for ready biodegradability according to OECD 301B, where PVOH exceeds 60% theoretical oxygen demand in 28 days. In production, a 12–18 wt% aqueous solution is prepared in a jacketed high-shear disperser at 75–85°C, deaerated under −0.08 MPa vacuum, and cast through a slot die onto a chromed steel belt running at 8–12 m/min. Five-zone drying uses air temperatures of 60°C, 75°C, 90°C, 100°C, and 85°C, followed by humidification to 8–12 wt% moisture to prevent edge curl. Terminal products include laundry detergent pods, dishwasher detergent sachets, agrochemical water-soluble pouches, and toilet bowl cleaner units. At plant relative humidity above 60%, resin pre-drying to 0.3 wt% moisture before dry blending is required, and borate-containing additives are excluded because they form gel networks during solution hold.
Downstream conversion of the film into thermoformed pockets involves web heating to 90–110°C under a forming die, followed by filling and sealing with compensation for film moisture drift. On a 600 mm wide web, edge-trim slitting is performed at 80–150 m/min; seal strength is measured after 24 h conditioning by ASTM F88/F88M-15 to ensure 1.5–3.0 N/15 mm peel strength. Failure modes observed on production lines include star-wheel puncture at low elongation below 150% and seal-face tearing when residual moisture exceeds 12 wt%. Converters therefore specify film elongation at break above 150–250% under ASTM D882-18 and moisture content 8–12 wt% by loss-on-drying before form-fill-seal operations.
When SELVOL 830 is charged as a protective colloid in vinyl acetate-ethylene (VAE) emulsion polymerisation, the balance between low solution viscosity for reactor mixing and sufficient grafted polyvinyl alcohol layer thickness to prevent particle coalescence governs reactor stability. In an 8–12 m³ stainless steel reactor equipped with a two-stage pitched-blade agitator operating at 55–70 rpm, the grade is charged as a pre-dissolved 8–10 wt% aqueous solution at 80°C before monomer feed begins. Dosage is 2.0–6.0 wt% on total vinyl acetate-ethylene monomer; lower addition near 2.0 wt% yields coarse particles with D50 between 1.6 µm and 2.4 µm and emulsion viscosity below 500 mPa·s, while higher addition near 6.0 wt% reduces D50 below 1.0 µm and raises Brookfield viscosity above 1,200 mPa·s. Ethylene pressure is maintained at 20–35 bar, and reaction temperature is controlled at 70–85°C; potassium persulfate initiator at 0.05–0.2 wt% on total monomer is fed during the 4–6 h monomer delay. Residual vinyl acetate is steam-stripped at 60–70°C under −0.08 MPa to below 0.05 wt%. Regulatory references for the resulting emulsions include FDA 21 CFR 175.105 for food-contact adhesives, EN 204 for non-structural wood adhesives, and Directive 2004/42/EC for VOC limits in architectural coatings; solids content is confirmed by ISO 3251:2019, viscosity by ISO 2555:2018, and pH by ISO 976:2013. Terminal product categories are VAE wood adhesives, nonwoven binders, interior architectural paints, and carpet backing compounds. Process limits are specific: at addition above 7 wt%, reactor torque rises sharply and jacket heat transfer becomes limiting; at below 1.5 wt%, coagulum above 250 µm exceeds 0.02% on a 100 mesh filter screen. Published data for exact shear-stability limits of SELVOL 830 in ethylene-rich VAE systems is limited, so pilot reactor transfer runs at 500 L scale are required before full production.
Post-stripping additivation of the VAE dispersion includes defoamer at 0.1–0.3 wt%, coalescent at 0–5 wt%, and preservative at 0.05–0.2 wt%; the dispersion is filtered through a 200 µm bag filter before drumming. Viscosity is adjusted to 2,000–8,000 mPa·s for adhesives or 500–2,000 mPa·s for coatings by varying SELVOL 830 level and ethylene content. Shelf stability requires storage between 5°C and 35°C; freeze-thaw cycling below 0°C causes irreversible granulation even with coagulant-free polymerisation.
In high-speed inkjet coating, surface sizing of woodfree paper with 1–5 wt% SELVOL 830 solution shifts ISO 535:2014 Cobb water absorption from 28–32 g/m² to 18–22 g/m² while retaining repulping yield above 85% in mill recycling trials. As a coating binder, SELVOL 830 is added at 0.5–2.0 parts per 100 parts dry pigment in precipitated calcium carbonate and silica-based inkjet receiver formulations, where it reduces dusting, evaluated by ASTM D5264-98 dry rub, and improves water-fastness of dye-based inks, evaluated by ASTM F2292-03. The compliance framework includes FDA 21 CFR 176.170 for food-contact paper and paperboard, ISO 2470-2:2019 for brightness retention, and ISO 287:2017 for moisture content in board converting. In a film press or flooded nip size press, the 4–8 wt% working solution is held at 50–60°C and applied at machine speeds from 150 m/min to 500 m/min; downstream drying cylinders are staged from 90°C to 130°C to avoid film splitting. Terminal product types include high-speed inkjet photo paper, label face stock, food-contact folding carton board, and silicone release liner base paper. Addition above 5 wt% in the surface sizing bath can elevate Brookfield viscosity above 120 mPa·s at 50°C, reducing film press pick-up uniformity, while addition below 1 wt% gives insufficient holdout on recycled liner grades.
For remoistenable adhesive coatings on envelope flaps, label stock, and paper tape, the dissolution speed of the binder after rewetting determines bond development within 0.2–0.5 s contact time. SELVOL 830 is formulated in dry-blend adhesives at 12–30 wt% of total solids, with plasticizer content 0–10 wt%, calcium carbonate filler 0–30 wt%, and biocide at 0.05–0.2 wt%; the balance is typically dextrin or modified starch that moderates open time and cold tack. The mixture is dispersed in water at 30–45 wt% solids at 30–50°C, then applied to paper or film substrates by reverse gravure, wire-wound rod, or air knife at 8–20 g/m² dry coat weight. Forced-air drying at 70–95°C reduces moisture to 3–5 wt%, after which the coated web is conditioned to 45–55% RH to prevent blocking. Compliance is established under FDA 21 CFR 175.105 for incidental food-contact adhesives and REACH registration for EU market access; peel performance of the adhesive bond is evaluated by ASTM D1876-08 T-peel. Terminal products include envelope flaps, remoistenable paper tapes, stamps, label stock, and business forms. The operational boundary is pH: above 9.5, the acetate ester content begins hydrolysing, and the adhesive loses rewetting speed over 90-day warehouse storage.
Unlike organic wax binders, ceramic powder granulation with SELVOL 830 is selected because the polyvinyl alcohol decomposes in the 250–400°C interval, leaving ash below 0.5 wt% in the sintered body. For technical alumina and zirconia formulations, the binder is added at 0.5–3.0 wt% on dry ceramic powder as a 5–10 wt% aqueous solution, optionally with 0.1–0.3 wt% polyethylene glycol as plasticizer and 0.05–0.1 wt% dispersant to control slurry viscosity before atomization. The suspension is processed through a spray dryer at inlet temperature 180–220°C and outlet temperature 90–110°C, producing granules with D50 40–120 µm for uniaxial pressing at 40–80 MPa. Green strength is measured by three-point bending on a universal testing machine, and sintered density and water absorption are evaluated by ASTM C373-18. Debinding is performed in an electric kiln with 60–120°C/h ramp to 250°C, a 120 min hold, then ramp to 400°C to complete carbon burnout. Regulatory compliance is covered by REACH registration and, for electronic substrates, Directive 2011/65/EU (RoHS). Terminal products include technical ceramic substrates, electronic insulators, catalyst supports, and dry-pressed floor and wall tiles. The addition window is narrow: above 3.5 wt%, die wall friction and lamination cracking increase, while below 0.3 wt%, granule survival through pneumatic conveying becomes unacceptable.
Polyester-cotton warp yarns sized with partially hydrolysed PVOH must retain sufficient film strength to survive shedding cycles at 300–500 picks per minute yet desize completely in hot water at 80–90°C before bleaching. SELVOL 830 is mixed in the size kitchen at 6–12 wt% solids on total size liquor, with wax lubricant at 0.2–0.5 wt% and optionally starch at 20–40% of total solids to lower cost. The slasher size box is maintained at 70–85°C, squeeze roll pressure is set to 3–5 kN to obtain 8–14% size add-on on warp yarn, and cylinder drying is staged from 105°C to 135°C. Weaving humidity is held at 60–65% RH to prevent embrittlement. Compliance for textile auxiliaries follows ZDHC MRSL and OEKO-TEX Standard 100 Annex 4 for restricted substances; desizing effluent is evaluated by ISO 6060:1989 chemical oxygen demand. Terminal products are woven shirting, workwear fabrics, bed sheeting, and polyester-cotton blended sportswear. At size box concentrations above 14 wt%, the film becomes too rigid for high-speed air-jet looms, and at below 5 wt%, warp breaks increase sharply on 40/1 Ne yarn. Published data for exact breakage rates in air-jet insertion with SELVOL 830 alone is limited.
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SELVOL Polyvinyl Alcohol 830 is a granular, fully hydrolyzed polyvinyl alcohol supplied by Sekisui Specialty Chemicals. The grade is specified with a 4 % aqueous solution viscosity of 34.0–42.0 mPa·s at 20 °C according to JIS K6726 and a degree of hydrolysis of 99.0–100.0 mol%. The residual acetate content is below 1.0 mol%, which limits cold-water solubility and necessitates heating above 80 °C for complete dissolution. SELVOL 830 is used in paper surface sizing, water-based adhesives, textile warp sizing, vinyl acetate emulsion polymerization, and aqueous barrier coatings where film tensile strength, oxygen barrier, and cold-water re-wet resistance are required. The intermediate molecular weight provides higher solution viscosity than low-molecular-weight fully hydrolyzed grades but lower transfer viscosity than high-viscosity grades at equal solids. These values are commercial specification points and do not constitute a guarantee of performance on a specific manufacturing line without plant confirmation.
Replacement of an 87.0–89.0 mol% hydrolyzed grade such as SELVOL 523 by SELVOL 830 shifts the polymer from cold-water-soluble to hot-water-soluble behaviour. The increase in hydrolysis to 99.0–100.0 mol% raises crystallinity and interchain hydrogen bonding, which reduces equilibrium swelling in water at 25 °C and raises film tensile strength when measured by ASTM D882. Compared with SELVOL 103, a low-viscosity fully hydrolyzed grade specified at 3.5–4.5 mPa·s, SELVOL 830 produces films with higher tear resistance and allows lower solids to achieve equivalent paper surface strength. In adhesive compounding, SELVOL 830 has lower surface activity than partially hydrolyzed grades, so wetting of low-energy polymer films requires a co-solvent or an additional surfactant. The differences in viscosity and hydrolysis are summarised in Table 1.
| Grade | Viscosity, 4 % aqueous solution, 20 °C | Degree of hydrolysis | Practical consequence in formulation |
|---|---|---|---|
| SELVOL 103 | 3.5–4.5 mPa·s | 98.0–99.8 mol% | Low solution body; limited film toughness; easy cold-water handling |
| SELVOL 523 | 23.0–27.0 mPa·s | 87.0–89.0 mol% | Cold-water soluble; surfactant character; lower water resistance |
| SELVOL 830 | 34.0–42.0 mPa·s | 99.0–100.0 mol% | Hot-water soluble; high tensile strength and water resistance |
| SELVOL 540 | 40.0–50.0 mPa·s | 87.0–89.0 mol% | High adhesion to hydrophobic surfaces; softer film |
Table 2 lists the commercial specification parameters for dry powder. The viscosity test is run on a 4 % non-neutralized aqueous solution at 20 °C; the degree of hydrolysis is determined by saponification back-titration under JIS K6726. Dissolution on plant scale is typically performed by slurrying the powder in cold water at 20–30 °C followed by heating to 90–95 °C for 30–45 min in a jacketed vessel with turbine agitation at 300–500 rpm. Direct dry addition to hot water produces fish-eye agglomerates and should be avoided. The solution pH is close to neutral; adjustment outside 4–10 can accelerate hydrolysis and viscosity drift during storage. Dry powder is hygroscopic and should be stored below 30 °C and below 60 % relative humidity; opened bags are re-sealed immediately. Aqueous solutions require a non-oxidizing biocide when held longer than 24 h at ambient temperature.
| Property | Test condition | Specification or typical range |
|---|---|---|
| Viscosity | 4 % aqueous solution, 20 °C | 34.0–42.0 mPa·s per JIS K6726 |
| Degree of hydrolysis | Saponification back-titration | 99.0–100.0 mol% per JIS K6726 |
| Volatile matter | Gravimetric, JIS K6726 | ≤5.0 % |
| Ash as Na2O | JIS K6726 | ≤0.5 % |
| pH | 4 % aqueous solution | 5.0–7.0 per JIS K6726 |
| Methanol content | Headspace gas chromatography | ≤1.0 % |
If solution haze persists after 45 min at 95 °C, the batch is checked for undissolved gels by filtered flow through a 250 μm screen. High-hardness water can reduce solubility because calcium ions interact with residual acetate and acetal impurities; softened water or a chelating agent is preferred. Viscosity drift during hold time is monitored with ISO 2555 Brookfield measurement at 20 rpm. For repeated small additions, a premix of 10 % solids can be prepared and diluted, but the head space must be vented to prevent pressure rise at 95 °C.
In paper surface sizing, SELVOL 830 is cooked to a 6–8 % solids solution before combination with oxidized starch or dextrin. A formulation containing 20–40 % PVOH on dry starch is applied on gate-roll or metering size presses to reduce surface porosity as measured by ISO 535 and to raise surface strength as measured by ISO 3783. Above 8 % solids, solution viscosity increases rapidly, and the size press film split becomes sensitive to roll speed and nip load. Transfer deficit is corrected by increasing nip pressure or reducing solids rather than by raising temperature alone. Foam formation is generally lower with SELVOL 830 than with partially hydrolyzed grades at equal solids, but defoamer addition may still be required when the size bath circulates at high shear. Drying capacity must be matched to the slower re-wetting of the fully hydrolyzed film; uneven drying can produce doctor blade scratches and calender picking. At machine speeds between 800 m/min and 1 200 m/min, shear rate in the size press nip can exceed 10 000 s-1, reducing apparent viscosity and altering the wet film thickness.
For water-based adhesives, SELVOL 830 is hydrated in a jacketed mix tank and cooled to 60 °C before addition of plasticizer, borate, or preservative. Borate ion at 0.5–2.0 % of PVOH solids produces a thixotropic gel through reversible diol crosslinking; the fully hydrolyzed grade shows lower gel response than partially hydrolyzed grades at equal borate addition because fewer accessible hydroxyl groups are present in the crystalline regions. Above 2.0 % borate, gel syneresis and short pot life are observed. In high-speed lamination, a positive-displacement pump with an in-line static mixer is used to break the gel structure under shear; viscosity rebuild occurs after application and increases wet tack. Bond strength after compression is tested by ASTM D905 for wood shear specimens, and ASTM D903 is used for peel adhesion on flexible substrates. For wood bonding, compression pressure of 0.7–1.2 MPa at 20–25 °C for 30–60 min is used in laboratory screening. On a production roller coater, open time is controlled by adding 5–15 % plasticizer such as glycerol or sorbitol on PVOH solids; plasticizer above 15 % reduces tensile strength and increases blocking. The pot life of borate-crosslinked compounds at 25 °C is typically shorter than 6 h, after which viscosity build exceeds pump capacity.
In vinyl acetate emulsion polymerization, SELVOL 830 is charged at 2–4 % on total monomer as the primary protective colloid. The near-total hydrolysis of the grade lowers surface activity relative to partially hydrolyzed PVOH, which can produce a broader particle size distribution at equal agitation and higher shear stability after polymerization. The molecular weight of SELVOL 830 contributes to final emulsion viscosity; however, freeze-thaw stability of the resulting latex is generally inferior to formulations based on 87.0–89.0 mol% hydrolyzed grades, and protective colloid content must be limited if low-temperature storage is specified. The emulsion particle size is measured by laser diffraction under ISO 13320. The use of SELVOL 830 as a post-polymerization viscosity modifier is also possible, but the addition must occur above 80 °C to ensure complete hydration.
In cementitious tile adhesives and gypsum-based compounds, SELVOL 830 is dry-blended at 0.5–3.0 % by total dry weight to improve water retention and open time. The fully hydrolyzed grade dissolves slowly in cold mix water; water above 20 °C improves dispersion. Water retention is evaluated by ASTM C1506 or EN 459-2 depending on the binder system. High ash or sodium levels in the cement can interact with PVOH hydroxyl groups and reduce the water-retention plateau; compatibility with calcium-rich media is therefore checked before production. Published data for specific tile adhesive formulations is limited, but the primary function is physical thickening during the first 30 min after mixing.
Cast films from SELVOL 830 are produced from aqueous solution by slot-die coating onto a polyester release liner and drying at 90–120 °C. The fully hydrolyzed grade develops higher tensile modulus and lower elongation at break than partially hydrolyzed material of equivalent viscosity when tested by ASTM D882. Oxygen transmission rate at 0 % relative humidity is below that of plasticized film when measured by ASTM D3985; at 50 % RH, the barrier deteriorates because water acts as a plasticizer in the amorphous phase. Residual moisture in the film is controlled between 3 % and 5 % before peeling. Over-drying below 3 % moisture causes film cracking during peel; under-drying above 5 % moisture produces blocking and lowered tensile strength. Film haze is lower when the solution is filtered through a 100 μm bag before coating. A wet coating thickness of 200–400 μm is typically used to yield a dry film thickness of 25–50 μm. At 120 °C air temperature, water removal follows the falling-rate period and requires sufficient residence time to avoid skin-over-liquid defects.
In textile warp sizing, SELVOL 830 is applied at 6–9 % solids from a slasher box at 60–70 °C to polyester/cotton yarn. The size film resists cold-water re-wetting after drying but is removed in finishing by desizing at 80 °C or by oxidative treatments. Bath viscosity remains more stable than starch-only formulations, although surface skin forms if bath temperature falls below 50 °C. Dry powder storage is set below 30 °C and below 60 % relative humidity; the material is not compatible with concentrated oxidizing acids or certain transition-metal salts that catalyze oxidative chain scission. Aqueous solutions are susceptible to microbial degradation and require a non-oxidizing biocide when held longer than 24 h.
