| HS Code | 803994 |
| Product Name | GOHSENOL EG-40P |
| Chemical Name | Polyvinyl alcohol |
| Cas Number | 9002-89-5 |
| Appearance | White granular powder |
| Odor | Odorless |
| Viscosity 4 Aqueous Solution At 20 C | 40 ± 4 mPa·s |
| Degree Of Hydrolysis | 80.0 ± 1.5 mol% |
| Residual Acetyl Content | 20.0 ± 1.5 mol% |
| Ph 4 Aqueous Solution | 6.0 ± 1.0 |
| Solubility | Soluble in water |
| Ash Content | ≤ 0.5 wt% |
| Loss On Drying | ≤ 5.0 wt% |
| Bulk Density | 0.40-0.60 g/cm³ |
| Specific Gravity | 1.27 at 20°C |
As an accredited GOHSENOL EG-40P factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | GOHSENOL EG-40P is supplied as a white granular powder in 20 kg multi-layer paper bags with a polyethylene liner. |
| Container Loading (20′ FCL) | 20′ FCL: 25kg bags shrink-wrapped on pallets, securely stowed and restrained to prevent movement during transit. |
| Shipping | GOHSENOL EG-40P is a polyvinyl alcohol powder shipped in sealed bags or containers. It should be kept dry, away from moisture and direct sunlight. Non-hazardous under normal transport conditions, but avoid dust inhalation. Handle with care to prevent bag damage and product contamination. |
| Storage | Store GOHSENOL EG-40P in a cool, dry, well-ventilated area away from direct sunlight and heat sources. Keep the original container tightly closed when not in use to prevent moisture absorption and contamination. Avoid storage near incompatible materials. Maintain stable room temperature; with proper storage, the product retains its quality within its stated shelf life. |
| Shelf Life | Shelf life is typically 2 years when stored sealed in a dry, cool place away from moisture and direct sunlight. |
In front-loading and low-water laundry cycles, the dissolution response of polyvinyl alcohol film at 10–15°C is controlled by the residual acetate content and the molecular weight of the polymer. GOHSENOL EG-40P combines a hydrolysis degree of 87–89 mol% with a 4% aqueous solution viscosity of 38–42 mPa·s at 20°C, producing a cast film that retains sufficient crystallinity for seal integrity but dissolves more slowly than low-hydrolysis grades, making it appropriate as the main film-forming resin when the formulation is adjusted with plasticizers or blended with other PVOH grades. In industrial detergent film casting, the resin fraction typically comprises 70–85 wt% PVOH, 8–15 wt% plasticizer such as glycerol or sorbitol, 0.5–1.5 wt% release agent, and residual water; EG-40P is commonly used as the high-viscosity backbone at 50–100 wt% of the PVOH portion, with lower hydrolysis grades added at 0–50 wt% to shift cold-water break-up toward 10°C. The aqueous casting solution is prepared at 18–25 wt% solids by slow addition of the powder into demineralized water at 80–90°C under high-shear mixing followed by deaeration, then applied through a slot die onto a moving steel belt or casting drum and dried in zoned ovens at 85–110°C. If drying air temperature exceeds 120°C, surface skinning traps water and creates bubble defects. Conditioning at 20–25°C and 40–55% RH is required before slitting because film moisture below 6% raises brittleness and film moisture above 12% raises blocking tendency. Compliance for detergent films includes biodegradability testing under OECD 301B or ISO 14851:2019, EU Detergent Regulation (EC) No 648/2004 for article labelling, and food-contact suitability under 21 CFR 177.1670 when film is evaluated for incidental food-contact sachets. Terminal product types include water-soluble unit-dose liquid detergent capsules, automatic dishwashing machine pouches, laundry additive sachets, and soluble packaging for premeasured hard-surface cleaners.
In vinyl chloride suspension polymerisation, GOHSENOL EG-40P functions as a primary or co-dispersant because its high molecular weight and 87–89 mol% hydrolysis reduce the interfacial tension between vinyl chloride droplets and the aqueous continuous phase after turbulent agitation. Typical dispersant charge is 0.05–0.15 parts per 100 parts vinyl chloride monomer, with EG-40P used at 0.03–0.08 wt% of VCM as the primary dispersant and 0.01–0.03 wt% of a lower-viscosity partially hydrolysed PVOH as secondary dispersant to control grain size and plasticizer uptake. The powder is dissolved in demineralized water at 4–6 wt%, filtered, and charged to a jacketed stirred polymerisation reactor operated at 55–65°C and 0.7–1.0 MPa with turbine impeller speeds typically in the 200–450 rpm range depending on vessel diameter and baffle geometry. The high molecular weight of EG-40P increases the protective layer thickness on monomer droplets, shifting the particle size distribution toward coarser grains and reducing primary particle coalescence. Published reactor-specific correlations between EG-40P charge and grain porosity in commercial PVC lines are limited; plant-scale optimisation is typically established through design-of-experiments because agitator shear, baffle configuration, and condenser load alter the equilibrium between droplet breakage and coalescence. Compliance for suspension PVC resin production falls under REACH EC 1907/2006, with resin particle size distribution determined by ISO 1624:2001, K-value by ISO 1628-2:2020, and residual vinyl chloride monomer by EN ISO 6401:2022. Operational boundaries include strict filtration of the dispersant solution before charging, since undissolved gel particles act as seed sites for reactor wall scale, and compatibility testing of any defoamer with PVOH solution viscosity before use. Terminal product types are suspension PVC resins converted into pipe, profiles, films, flooring, and cable sheathing.
At the size press, EG-40P is combined with oxidized starch, cationic starch, or enzyme-converted starch to increase surface strength and reduce dusting of printing grades. The addition level is 0.5–2.0 wt% of dry starch in the size solution, with total size solids maintained at 6–12 wt% and the size bath held at 60–70°C after PVOH cooking at 90–95°C. Above 2.0 wt% PVOH on dry starch, phase separation may occur as the solution cools, causing gel particles and film splitting at the nip; therefore, the dosing point and mixing intensity in the working tank are controlled to avoid local PVOH concentration spikes. Borate-containing starch additives must be excluded unless controlled viscosity increase is intended, because PVOH-borate gelation can produce lumps. The size press or metering film coater applies 1.5–4.0 g/m² dry pick-up per side depending on base paper absorbency, and the sheet is dried to 5–8% final moisture through IR and cylinder dryers. Paper and board intended for food contact must comply with 21 CFR 176.170 for aqueous and fatty food categories, while physical testing is carried out under ISO 536:2019 for grammage, ISO 535:2023 for Cobb60 water absorption, and ISO 3783:2017 for surface pick resistance. Terminal product types include coated folding box board, offset printing paper, linerboard for corrugated boxes, and paper sacks requiring improved surface strength.
In water-based laminating adhesives for paper, board, and foil lamination, EG-40P is formulated at 1–5 wt% of total adhesive dry solids to raise wet tack and improve fibre-tear adhesion on low-porosity substrates, while dextrin or starch ester fractions are reduced accordingly. Adhesive preparation uses a high-shear mixer at 70–80°C to dissolve the resin into the starch base, followed by cooling to 35–45°C at application to avoid thermal shock and viscosity drift. Typical coating weight is 20–40 g/m² wet, applied by roller coater, slot coater, or curtain coater before nip lamination at 0.3–0.6 MPa pressure; adhesion development follows water removal into the substrate and hydrogen bond formation. Compliance for food packaging adhesives falls under 21 CFR 175.105, with overall food contact articles evaluated under EC 1935/2004; for wood-based laminates, durability class testing may follow EN 204:2016 where moisture resistance is relevant. Process boundaries include adding preservative against microbial degradation in warm starch/PVOH tanks, and avoiding borate-based gelation accelerators unless a controlled viscosity increase is required. Terminal product types include spiral-wound paper tubes and cores, carton side-seam lamination, flexible food-packaging lamination, and book cover lamination.
For ring-spun cotton and cotton/polyester warp yarns, EG-40P is employed in slasher sizing formulations at 4–8 wt% of dry size solids, typically with oxidized or modified starch at a starch:PVOH dry solids ratio of 60:40 to 80:20, giving a dry add-on of 8–14% by warp weight. The size liquor is prepared at 80–90°C and applied in a slasher or high-speed sizing machine, after which yarn is dried over steam-heated cans and split to avoid size bridges. Textile processing compliance is demonstrated through EU REACH EC 1907/2006 Annex XVII restrictions and ZDHC MRSL v3.1 for textile auxiliaries, with final fabric safety evaluated under OEKO-TEX Standard 100 where brand specifications require. Terminal product types include woven shirting, sheeting, workwear fabric, and denim prepared for subsequent desizing at 70–90°C.
Vinyl acetate homopolymer and copolymer emulsions use polyvinyl alcohol as the primary protective colloid during free-radical emulsion polymerisation. EG-40P is charged at 2–6 wt% based on total monomer, prepared as a 10–15 wt% aqueous stock solution and added to the reactor premix with the aqueous phase before initiation. Semi-batch polymerisation proceeds at 70–85°C with delayed addition of vinyl acetate monomer over 3–5 h under mechanical agitation, using persulfate or redox initiation; the high degree of polymerisation of EG-40P increases emulsion viscosity and reduces coalescence of growing particles, shifting the final emulsion to a broader particle size distribution and higher structural viscosity. At protective colloid loadings above 6 wt% on total monomer, final high-shear viscosity may exceed the handling range of standard transfer pumps, so addition rate and cooling capacity must be evaluated on production-scale equipment. Compliance for PVAc emulsions used in wood adhesives is assessed under 21 CFR 175.105 for food packaging, EN 204:2016 for durability classes D1 to D4, and REACH EC 1907/2006 for monomer residue and auxiliary substances. Operational boundaries include avoiding borax or boric acid during polymerisation to prevent premature PVOH crosslinking, and maintaining pH below 8.5 where ester hydrolysis acceleration is undesirable. Terminal product types include PVAc wood glues, paper lamination adhesives, carpet backing compounds, and construction adhesives.
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GOHSENOL EG-40P is a partially hydrolysed polyvinyl alcohol supplied as a white to pale yellow granular powder. The product is a vinyl alcohol–vinyl acetate copolymer with a degree of hydrolysis specified within 86.5–89.0 mol% and a Brookfield viscosity of 40.0–46.0 mPa·s for a 4% aqueous solution at 20°C, determined in accordance with JIS K6726. The corresponding residual acetate content is 11.0–13.5 mol%. This places EG-40P in the medium-to-high viscosity segment of partially hydrolysed polyvinyl alcohol grades, where formulation requirements include cold-water dispersibility, film cohesive strength, and controlled thickening behaviour without the hot-water dissolution constraints of fully hydrolysed polyvinyl alcohol.
Analytically, the product has a pH specification of 5.0–7.0 for a 4% aqueous solution. Volatile matter is controlled at a maximum of 5.0% by mass, and ash, expressed as sodium oxide, is controlled at a maximum of 0.5%. The material has CAS Registry Number 9002-89-5. The partial hydrolysis level and viscosity grade distinguish EG-40P from fully hydrolysed polyvinyl alcohol grades, which typically require heating to 80–95°C for dissolution and exhibit greater film water resistance but lower rewettability.
In vinyl acetate and vinyl acetate–ethylene emulsion polymerization, EG-40P is predissolved in demineralized water and charged as a protective colloid before monomer addition. The 11.0–13.5 mol% residual acetate groups lower interfacial tension at the vinyl acetate–water interface, while the 40.0–46.0 mPa·s aqueous viscosity provides a higher molecular weight than low-viscosity partially hydrolysed grades. This combination increases the hydrated steric barrier on developing latex particles. In stirred stainless-steel reactors equipped with turbine impellers, protective-colloid loadings are commonly 2–10 parts per hundred parts vinyl acetate monomer, with the exact loading set by target particle size, latex viscosity, and shear stability requirements.
The grade is also used in acrylic and styrene–acrylic emulsion systems where reduced pre-emulsion preparation time is required. Because residual acetate groups suppress crystallinity, the polymer does not require high-temperature cook-out. Agitation during dissolution should avoid vortexing and air entrainment; air-entrained foam stabilised by surface-active polyvinyl alcohol can persist for several hours and interfere with particle size analysis by dynamic light scattering. High-shear post-processing in rotor-stator dispersers or high-pressure homogenizers can strip weakly adsorbed colloid and increase coagulum if the aqueous-phase polymer concentration falls below the critical coverage concentration. Published data for this specific equipment configuration is limited; therefore, reactor shear profile and colloid demand should be confirmed by pilot-scale trials.
Specification control is performed on each production lot. The degree of hydrolysis is measured by saponification back-titration according to JIS K6726:1994, and viscosity is measured on a fully deaerated 4% aqueous solution at 20°C with a Brookfield viscometer. The ash limit of 0.5% and volatile matter limit of 5.0% are relevant to emulsion polymerization and adhesive compounding because ionic residues can destabilise latex or affect electrical properties. The specified pH window of 5.0–7.0 reduces neutralisation demand in neutral latex systems, but buffering remains necessary when vinyl acetate hydrolysis releases acetic acid during storage or polymerisation.
| Parameter | Specification | Analytical basis |
| Degree of hydrolysis | 86.5–89.0 mol% | JIS K6726 |
| Viscosity, 4% aqueous solution, 20°C | 40.0–46.0 mPa·s | JIS K6726 |
| pH, 4% aqueous solution | 5.0–7.0 | JIS K6726 |
| Volatile matter | max 5.0% | JIS K6726 |
| Ash, as Na₂O | max 0.5% | JIS K6726 |
| Residual acetate content, calculated | 11.0–13.5 mol% | Derived from hydrolysis degree |
Batch-to-batch viscosity variation is controlled within a 6.0 mPa·s span at the 4% concentration, which supports continuous emulsion polymerisation lines where feed viscosity must remain in a narrow operating window. Powder particle size distribution influences dissolution time; coarser granules dissolve more slowly than fine powder but reduce dust generation during direct addition. Closed handling with dried conveying air is recommended when the product is stored at relative humidity above 60%, because moisture uptake can reduce flowability and weighing accuracy.
Low-viscosity partially hydrolysed grades in the same series are specified where lower solution viscosity at equal concentration is required for high-solids coating or spray drying. EG-40P is selected when higher thickening efficiency, higher film tensile strength, or greater protective-colloid molecular weight is required. Fully hydrolysed polyvinyl alcohol grades with degrees of hydrolysis ≥98 mol% provide improved water resistance and lower dissolution rate; they are preferred for barrier coatings and for film applications requiring low equilibrium moisture uptake. Substitution between EG-40P and a lower-viscosity grade should be based on equal-solution-viscosity comparison using a Brookfield viscometer at the application temperature, not on equal mass replacement.
Remoistenable adhesives for envelopes, labels, and paper tape require a dry film that develops tack after application of a thin water layer. EG-40P provides this response because its 86.5–89.0 mol% hydrolysis level leaves sufficient acetate groups to disrupt crystalline domains after drying. Fully hydrolysed grades develop stronger interchain hydrogen bonding and therefore require more water and longer dwell time to regenerate tack. The 40.0–46.0 mPa·s solution viscosity produces films with greater cohesive strength and block resistance than low-viscosity partially hydrolysed grades, reducing fibre pick during high-speed converting. Adhesion to porous paper substrates can be quantified by peel resistance testing under ASTM D903 or by fibre tear testing under TAPPI T 459; published data for this specific formulation is limited.
In remoistenable adhesive compounding, EG-40P is dissolved in water at 10–20% solids and applied by roller or gravure coating. Drying at elevated paper surface temperatures can increase crystallinity in the dried film and reduce re-wetting speed, while residual moisture from insufficient drying can increase blocking. The product should not be compounded with amine-based additives that raise pH above 7.0 and accelerate ester hydrolysis of residual acetate groups. Such hydrolysis shifts the grade toward fully hydrolysed behaviour and reduces cold-water tack responsiveness.
In paper coating and surface sizing, EG-40P is used as a water-soluble binder in formulations containing precipitated calcium carbonate or kaolin. The polymer is typically applied at 5–15% by mass of dry polymer on pigment, depending on coating speed and IGT pick strength requirements. The 40.0–46.0 mPa·s viscosity at 4% solids translates to higher aqueous-phase viscosity at coating solids than low-viscosity polyvinyl alcohol grades. This can improve water retention and film splitting but may increase blade pressure on high-speed blade coaters. Coating formulations containing polyvinyl alcohol should be evaluated for high-shear rheology using a capillary viscometer or slit die viscometer; Brookfield data alone do not predict blade coater behaviour.
Textile sizing formulations incorporate EG-40P when warp yarns require high film cohesion and easy desizing. A size bath prepared at 6–12% solids is applied to cotton or polyester/cotton yarns on slasher sizing machines. Film tensile properties can be measured on cast films according to ASTM D882-18. Because EG-40P is partially hydrolysed, it can be removed by cold-water desizing, reducing energy demand compared with fully hydrolysed grades that require hot-water desizing. Size film resistance to high-humidity weaving environments is lower than that of fully hydrolysed polyvinyl alcohol; relative humidity above 60% can soften the size film and reduce abrasion resistance. Pre-drying of sized yarn before the shed may be required under these conditions.
The aqueous solution behaviour of EG-40P is non-linear with respect to concentration. At 4% solids and 20°C, the viscosity is 40.0–46.0 mPa·s. As concentration increases, apparent viscosity rises more steeply than predicted by dilute solution theory, consistent with polymer coil overlap. Solutions at 10–20% solids typically exhibit pseudoplastic behaviour under shear; a Brookfield RV spindle at low rotational speed provides an apparent viscosity reading that is strongly affected by thixotropy and air entrainment. A cone-and-plate viscometer with controlled shear rate is advisable when specifying the product for continuous metering pumps.
The polymer should be added to the vortex of mechanically agitated water at 20–30°C. After initial dispersion, the batch may be heated to 80°C for 30–60 min to ensure complete dissolution. The absence of gel particles can be checked by filtration through a 100 μm screen using a pressure filter; retained gel bodies indicate that dissolution time or agitation intensity should be increased. Temperature control during emulsion polymerisation is a critical boundary. The protective-colloid solution should not be held for prolonged periods at temperatures above 80°C because thermal hydrolysis can reduce residual acetate content and increase viscosity drift. In continuous processes, jacketed feed tanks maintain the aqueous polyvinyl alcohol phase at 20–30°C to limit viscosity loss and microbial growth; biocides may be required if hold time exceeds 24 h. The product is compatible with nonionic and anionic surfactants, but incompatible with high-valent metal salts that can complex with hydroxyl groups and precipitate the polymer. These operational boundaries are based on standard polyvinyl alcohol solution preparation practice; published data for this specific configuration is limited.
| Framework | Scope relevant to EG-40P | Verification basis |
| FDA 21 CFR §176.170 | Components of paper and paperboard in contact with aqueous and fatty foods | Final article compliance must be confirmed under intended conditions of use |
| FDA 21 CFR §176.180 | Components of paper and paperboard in contact with dry food | Final formulation and extractives testing apply |
| EU Regulation (EC) No 1935/2004 | Food contact materials framework | Good manufacturing practice documentation and final migration testing required |
| REACH (EC) No 1907/2006 | Registration, evaluation, and authorisation of chemical substances | Polymer exemption may apply; monomer and additive substances must be registered where applicable |
| RoHS 2011/65/EU | Restriction of hazardous substances in electrical and electronic equipment | Not material-specific; final homogenised component assessment required |
These references are a compliance screening list and do not replace article-specific migration testing or end-use certification for the formulated product.
