| HS Code | 654452 |
| Product Name | ELVANOL 75-15 |
| Chemical Family | Polyvinyl Alcohol (PVOH) |
| Chemical Formula | (C2H4O)n |
| Cas Number | 9002-89-5 |
| Appearance | White to cream granular powder |
| Degree Of Hydrolysis | 75.0 mol % (typical) |
| Viscosity 4 Aqueous Solution 20 C | 15 cP (typical range: 12-18 cP) |
| Ph 4 Aqueous Solution | 5.0-7.0 |
| Specific Gravity | 1.27 |
| Bulk Density | 0.45-0.55 g/cm³ |
| Ash Content | ≤ 0.5 wt % |
| Volatile Content | ≤ 5.0 wt % |
| Solubility | Soluble in water |
| Residual Acetyl Content | ~25 mol % |
As an accredited ELVANOL 75-15 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ELVANOL 75-15 is supplied as a white granular powder in 50 lb (22.7 kg) multi-ply paper bags. |
| Container Loading (20′ FCL) | 20′ FCL container loading of ELVANOL 75-15 ensures secure, dry bulk shipment with proper palletization for safe transport. |
| Shipping | ELVANOL 75-15 is a polyvinyl alcohol resin supplied as a free-flowing white granular powder. It is non-hazardous for transport, typically packed in multi-wall paper bags or FIBCs. Ship in dry containers, protect from moisture and excessive dust; no special transport classification is required. |
| Storage | Store ELVANOL 75-15 in a cool, dry, well-ventilated area away from heat, open flames, and incompatible materials. Keep containers tightly sealed to prevent moisture absorption and clumping. Avoid generating dust and protect from water/humidity. Use proper labeling and observe stock rotation to maintain quality within the specified shelf life. |
| Shelf Life | Shelf life is typically two years when stored in a cool, dry area, sealed in original packaging. |
A recycled linerboard machine introduces fully hydrolysed polyvinyl alcohol grade ELVANOL 75-15 as a synthetic co-binder at the size press, typically after a makedown sequence designed to prevent fish-eye formation. The granular resin is first dispersed into cold service water at 18–22 °C under a high-shear sawtooth impeller operating at 900–1200 rpm. The resulting 6–10 wt% suspension is steam-heated to 90–95 °C and held for 30–45 min until a clear, gel-free solution forms. If the dry grade is charged into water above 50 °C, the swollen surface layer blocks the unhydrated core and produces insoluble agglomerates that deposit on size press rolls and doctoring blades. The cooked solution is maintained at 60–65 °C in an insulated holding loop before being blended with oxidised corn starch at PVOH:starch dry ratios of 1:4 to 1:10. At the flooded-nip size press, total size solids are typically 5–8 wt% and pickup is 35–55 g/m² per side on kraftliner and white-top testliner. The 4% aqueous solution viscosity of ELVANOL 75-15 is 12–16 mPa·s at 20 °C, and its hydrolysis degree is 99.0–99.8 mol%. These properties give the size film higher tensile strength than starch-only film, and the dry film rewets less during the second pass of a two-station coating process. Cobb60 water absorption measured by TAPPI T 441 om-20 and ISO 535 is typically reduced by 15–30 % against a starch-only control when the PVOH fraction is 10–12 wt% of total dry size. Above 12 wt% PVOH in the size blend, mill trials show increased misting and transfer roll film build-up, particularly on metering rods coated with hard chrome. Under U.S. FDA 21 CFR 176.170, components of paper and paperboard in contact with aqueous and fatty foods must be applied under good manufacturing practice. ELVANOL 75-15 can be used within the scope of that section if the finished paper complies with extractives limitations. In the European Union, compliance is assessed under Regulation (EC) No 1935/2004 and applicable German BfR Recommendation XXXVI for paper and board intended for food contact. Wastewater from paper broke containing this PVOH grade contributes soluble COD, and activated sludge plants with hydraulic retention times below 6 h may show incomplete removal, leading to discharge limits under EU Directive 2010/75/EU.
Because residual moisture above 5.0 wt% generates steam bubbles at the die, ELVANOL 75-15 intended for water-soluble packaging film is predried at 70–80 °C for 4–6 h when the ambient relative humidity exceeds 60 %. The resin is then dry-blended with a polyol plasticiser before melt compounding. Typical plasticiser loadings are 15–25 wt% glycerol or 10–20 wt% sorbitol based on total formulation weight. The premix is fed to a co-rotating twin-screw extruder with a screw length-to-diameter ratio of 28:1–32:1. Zone temperatures are set from 110 °C in the feed throat to 185–205 °C near the die. Melt temperatures above 220 °C cause gel particles and yellowing within 5–10 min residence time. The annular die gap is 0.8–1.2 mm, and the blow-up ratio is held between 1.5:1 and 2.5:1 to balance machine-direction and transverse-direction tensile properties. Finished film of 35–50 µm thickness is conditioned at 23 °C and 50 % RH for at least 24 h before mechanical testing. Tensile strength and elongation at break are measured according to ISO 527-3 or ASTM D882-18. Full dissolution in water at 20 °C occurs most rapidly when the film is unstretched and plasticiser content is above 20 wt%. The same formulation shows a sharp reduction in yield strength after storage at 40 °C and 75 % RH, where plasticiser migration to the film surface creates blocking. Abrasion resistance and seal strength are lower when the film is pre-exposed to alkaline detergents with pH above 11.0, because surface hydrolysis is accelerated. For detergent unit doses, the film must maintain a residual moisture of 8–12 wt% to avoid brittle fracture at 5 °C while still dissolving in 25 °C water. Published data for dissolution-test variation in this specific commercial format is limited. Regulatory compliance for agrochemical packaging must be checked under Regulation (EC) No 1272/2008 and the applicable national packaging rules.
Ceramic powder processing uses ELVANOL 75-15 as an organic binder in spray-dried press-ready alumina and zirconia granules. The binder is first dissolved to a 10–15 wt% aqueous stock solution under slow addition to a high-shear mixer to prevent local concentration gels. The binder dose on dry ceramic solids is 0.5–2.0 wt%, adjusted to the specific surface area of the powder and the target green density. Spray-dried granules made with addition levels below 0.5 wt% tend to produce low granulate strength and dust. Levels above 2.0 wt% extend the organic burnout interval and increase the risk of black-core oxidation defects. Green body flexural strength is measured by three-point bending according to ISO 14704 or ASTM C674-13. Strength rises with binder content up to a plateau, after which polymer film displaces particle packing and reduces green density. During thermal debinding, the binder decomposes in air between 250 °C and 450 °C. The furnace ramp rate in this zone must be held to 0.5–1.0 °C/min for cross-sections above 10 mm. Faster ramping causes volatile release pressure that can produce lamination cracks near the green body surface. After burnout above 550 °C, residual carbon should be below 0.05 wt% to prevent strength loss in subsequent sintering. Borate-based additives are incompatible with fully hydrolysed PVOH because rapid crosslinking increases solution viscosity and may cause irreversible gelation in the feed tank. The ceramic slip pH is maintained between 5.0 and 7.0, matching the solution pH range of the binder, to preserve electrostatic dispersant performance. Published data for this specific configuration is limited.
Cotton/polyester warp yarns on high-speed shuttleless looms require a size formulation based on starch, acrylic size and fully hydrolysed polyvinyl alcohol. ELVANOL 75-15 is added to the starch cooker at 5–15 % of total size solids to improve film toughness and reduce shedding at the heddle and reed. The cooking vessel operates at 130–140 °C for 5–10 min, then the size liquor is discharged to a holding box at 85–90 °C. The slasher squeeze pressure is set at 10–20 bar depending on yarn construction, giving a size add-on of 8–12 % dry weight on warp yarn. Dry size film properties are evaluated by tensile strength and elongation on isolated cast films per ISO 527-3. The fully hydrolysed character of ELVANOL 75-15 reduces cold-water removability, so the woven fabric requires oxidative or enzymatic desizing when hot-water washing alone is insufficient. Desizing efficiency is checked by residual starch and PVOH detection with iodine and boric acid colouration. Warp breaks per million picks are typically higher when PVOH addition exceeds 15 % of total size solids because the size film becomes brittle under weaving-room conditions below 40 % RH. The product is not added directly to continuous dyeing baths. Size liquor recycling through an ultrafiltration unit can recover a fraction of the PVOH, but membrane fouling increases above 8 wt% solids. Compliance with waste discharge limits requires COD reduction before biological treatment, and hydraulic retention times below 8 h can reduce removal efficiency.
When the notched bed is exposed to air during open-time testing, ELVANOL 75-15 is used as a dry-blended rheology-stabilising binder at 0.2–0.5 wt% of total dry weight. The grade is ground into fine particles or pre-blended with calcium carbonate to prevent segregation in the vertical mixer. During application, dissolved PVOH increases surface tack of the fresh bed and reduces rapid skin formation at the exposed edge of the adhesive. Open time is evaluated under EN 1346, tensile adhesion after water immersion is tested according to EN 1348, and deformability is measured by EN 12002. The addition level is limited because PVOH above 0.5 wt% can entrain excessive air during high-shear mixing with a paddle mixer at 500–700 rpm, reducing hardened mortar compressive strength. Flexural and compressive strength are measured by EN 196-1. A reduction of more than 10 % compared with the control warrants adjustment of the water-to-cement ratio. In high-humidity warehousing above 75 % RH, the dried binder film can absorb moisture and soften, lowering shelf stability of the packaged dry blend. Desiccants or moisture-barrier packaging are required when storage exceeds 6 months. Published data for this specific configuration is limited.
API Class G or Class H cement slurries for primary casing and liner jobs accept ELVANOL 75-15 as an auxiliary fluid-loss-control polymer when bottomhole static temperatures are below 60 °C. The dry grade is preblended with cement at 0.3–1.0 % by weight of cement before batch mixing with fresh water at a water-to-cement ratio of 0.44–0.50. Mixing is performed on a field-standard paddle mixer at 4,000 rpm for 35 s, consistent with procedures in API RP 10B-2 / ISO 10426-2. Addition of fully hydrolysed PVOH raises plastic viscosity from a typical base range of 30–50 mPa·s to 60–90 mPa·s at 25 °C, and yield point increases by 5–20 lb/100 ft² depending on slurry density. Filtrate loss after 30 min at 52 °C and 6.9 MPa differential pressure is reduced from untreated values above 1,000 mL to below 150 mL when measured using the stirred fluid-loss cell specified in ISO 10426-2. At doses above 1.5 % by weight of cement, the slurry exhibits severe gelation and can develop free water values above 2.0 mL after static conditioning. Typical well construction criteria require free water below 3.5 mL per 250 mL of slurry at 90 °C. The polymer is not suitable for high-temperature environments above 80 °C, where thermo-oxidative chain scission can degrade viscosity and reduce fluid-loss effectiveness. The material is compatible with lignosulfonate retarders at temperatures below 60 °C, but incompatible with certain polyamine-based accelerators that cause premature crosslinking of the hydroxyl groups. The product has limited solubility in high-salinity brines above 5 wt% NaCl, and prepared solutions should be tested for cloud point or precipitation before being combined with cementitious solids.
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ELVANOL 75-15 is a low-viscosity fully hydrolysed polyvinyl alcohol grade produced by Kuraray Co., Ltd. The product is supplied as a white to off-white granular solid and is specified for aqueous solution processes requiring controlled solution viscosity, low cold-water sensitivity after drying, and film strength in downstream sizing or coating. The numerical segment of the product designation corresponds to a nominal 4% aqueous solution viscosity range of 13.0–16.0 mPa·s at 20 °C. The degree of hydrolysis is typically 99.0–99.8 mol%, which differentiates ELVANOL 75-15 from partially hydrolysed grades with higher residual acetate content and lower crystallinity. In textile warp sizing, paper surface sizing, adhesive compounding, and emulsion polymerization protective colloid systems, ELVANOL 75-15 is selected where lower molecular weight permits higher solids at a given machine viscosity. Compared with higher-viscosity ELVANOL grades in the fully hydrolysed series, the product delivers reduced solution viscosity and lower film cohesive strength at equivalent solids. These differences are controlled primarily by molecular weight, not by hydrolysis level.
Specification data should be read against the supplier technical data sheet, because lot-to-lot variability and test preparation influence PVOH measurements. The values in Table 1 are representative of the commercial product. Viscosity is measured on a 4% aqueous solution at 20 °C using rotational viscometry aligned with ISO 2555. The degree of hydrolysis is determined by saponification titration and is reported as mole percent of vinyl alcohol units. pH is determined on the same 4% solution. Volatile matter and ash are controlled to limit the effect of moisture and inorganic residues on film clarity and adhesive performance.
| Property | Test condition | Specification |
| Viscosity | 4% aqueous solution, 20 °C, rotational viscometer | 13.0–16.0 mPa·s |
| Degree of hydrolysis | saponification titration, JIS K6726 | 99.0–99.8 mol% |
| pH | 4% aqueous solution, 20 °C | 5.0–7.0 |
| Volatile matter | loss on drying | ≤5.0 % |
| Ash | residue on ignition as Na2O | ≤0.5 % |
The pH range of 5.0–7.0 is typical for fully hydrolysed PVOH and is stable in non-buffered aqueous solutions. The viscosity specification is narrow relative to generic PVOH, which allows closer control of size-press pickup and adhesive coat weight in continuous processes. Published data for this specific grade in on-line viscometer validation is limited; calibration of in-line viscometers should be performed against laboratory rotational measurements at the same temperature.
Dissolution of fully hydrolysed PVOH differs from partially hydrolysed grades because the high degree of hydrolysis reduces swelling and solubility at ambient temperature. ELVANOL 75-15 is typically slurried in water at 20–30 °C and then heated to 90–95 °C under low-shear agitation. Production vessels using side-sweep turbines or low-speed anchor impellers provide effective dispersion without excessive air entrainment. A hold time of 30–45 min at temperature is common in vessels with a liquid depth-to-diameter ratio of 1.0–1.5. High-speed dispersers and cavitating pumps should not be used because shear-induced chain scission can lower viscosity. In plants where ambient humidity exceeds 60 %, the granular product should be stored in sealed hoppers or pre-dried because moisture uptake changes the effective solids content. Dissolved solutions are sensitive to borate ions, certain multivalent salts, and strongly acidic conditions, which can produce gelation or viscosity instability. Strong oxidisers may initiate chain scission. Sustained melt processing above 200 °C may liberate acetic acid and discolour the polymer; therefore, direct steam injection should be controlled to avoid localised hot spots. These handling boundaries are consistent with fully hydrolysed PVOH of comparable molecular weight.
At 4% solids and 20 °C, ELVANOL 75-15 displays a solution viscosity of 13.0–16.0 mPa·s, placing it at the low-viscosity end of the fully hydrolysed product line. The lower molecular weight reduces chain entanglement and permits higher solution solids before a given pump, transfer line, or roll-nip pressure limit is reached. In size presses and blade coaters, the reduction in water load per kilogram of applied film can decrease after-drying energy consumption. Film formation from the fully hydrolysed grade is controlled by the 99.0–99.8 mol% hydrolysis level. The low residual acetate content allows strong hydrogen bonding and high crystallinity after water removal, producing a clear film that resists cold-water dissolution but re-dissolves when heated above 90 °C. The trade-off for low solution viscosity is lower film tensile strength compared with higher-viscosity products. Because PVOH solutions are pseudoplastic under high shear, laboratory Brookfield viscosity values at 20 °C should not be extrapolated directly to high-speed coating. A cone-and-plate or capillary viscometer is required to characterise viscosity at shear rates above 1000 s⁻¹. Published data for this specific grade in high-shear rheology is limited.
In emulsion polymerization, ELVANOL 75-15 is used as a protective colloid for vinyl acetate and acrylic systems. The low solution viscosity permits the preparation of high-solids stabilising solutions without excessive reactor charge viscosity. Fully hydrolysed PVOH provides high grafting efficiency with vinyl acetate and contributes to the final emulsion viscosity and particle size distribution. The 99.0–99.8 mol% hydrolysis level reduces water sensitivity of the dried film compared with partially hydrolysed protective colloids, but reduces cold-water solubility of residual PVOH. The lower chain length may require more protective colloid by weight to achieve equivalent emulsion shelf stability compared with medium-viscosity grades. Process control during reactor charging should account for the high solution temperature required to dissolve the product; if added as a cold slurry, undissolved granules may persist. Published data for this specific grade in pressure-rated emulsion reactors is limited.
Formulators replace a medium-viscosity grade such as ELVANOL 71-30 with ELVANOL 75-15 when the process objective is to raise solids at constant machine viscosity or to improve penetration into dense substrates. The trade-off is a reduction in film cohesive strength because the lower molecular weight yields shorter polymer chains. In adhesive compounding, this reduction may require an increase in total PVOH content or the addition of a compatible tackifier. In slasher sizing on high-speed rapier and air-jet looms, the lower viscosity allows size solution to penetrate more deeply into spun cotton yarns and reduces viscosity drift in the size box during continuous running. A comparison of the fully hydrolysed product line is shown in Table 2. The values are from supplier technical bulletins and represent typical ranges, not release specifications.
| Product | 4% viscosity at 20 °C | Hydrolysis | Typical processing consequence |
| ELVANOL 75-15 | 13.0–16.0 mPa·s | 99.0–99.8 mol% | Higher solids, deeper penetration, lower film strength |
| ELVANOL 71-30 | 27.0–33.0 mPa·s | 99.0–99.8 mol% | Balanced viscosity and film strength |
| ELVANOL 70-75 | 70.0–75.0 mPa·s | 99.0–99.8 mol% | High film strength, limited high-solids handling |
The selection among these grades is driven by the minimum film strength required in the end use. In paper applications, the high hydrolysis level of ELVANOL 75-15 maintains water resistance after drying, while the low viscosity helps avoid film piling behind doctor blades on high-speed coaters. However, the same property reduces the ability to build thick surface films. If surface film thickness and cohesive strength are the primary requirements, a higher-viscosity fully hydrolysed grade should be specified. In textile sizing, add-on levels are often adjusted to compensate for lower film strength when ELVANOL 75-15 replaces a medium-viscosity product. Published data for this specific grade in commercial air-jet loom trials is limited; mills should conduct controlled size box evaluations because yarn count, size press configuration, and loom speed affect the result.
Partially hydrolysed grades with 87–89 mol% hydrolysis dissolve at lower temperatures and retain less water resistance after drying. Compared with those grades, ELVANOL 75-15 requires dissolution above 90 °C but yields films with higher cold-water resistance and higher tensile strength under humid conditions. The choice is therefore not governed by viscosity alone; hydrolysis level determines solubility and water resistance, while viscosity determines application thickness and penetration.
For indirect food-contact applications, the supplier regulatory datasheet lists clearances under 21 CFR 175.105 for adhesives, 21 CFR 176.170 for components of paper and paperboard in contact with aqueous and fatty foods, and 21 CFR 176.180 for components in contact with dry food. These clearances are end-use specific and require confirmation against the final formulation and food-contact conditions. Under REACH, polyvinyl alcohol as a polymer is not subject to registration as a monomer-reacted polymer, but downstream users are responsible for evaluating monomer impurities and national occupational exposure limits. The product should be handled with local dust extraction to keep respirable dust below the applicable workplace exposure limit. Bulk handling equipment should be grounded to avoid static charge accumulation. Published data for this specific grade in European food-contact compliance is limited beyond the supplier regulatory datasheet.
