| HS Code | 596145 |
| Product Name | GOHSENOL EG-05P |
| Chemical Name | Polyvinyl Alcohol |
| Appearance | White granular powder |
| Degree Of Hydrolysis | 86.5 - 88.5 mol% |
| Viscosity | 4.5 - 5.5 mPa·s (4% aqueous solution, 20°C) |
| Ph | 5.0 - 7.0 |
| Ash Content | ≤ 0.3% |
| Volatile Content | ≤ 5.0% |
| Average Polymerization Degree | approximately 500 |
| Solubility | Soluble in hot water above 85°C |
As an accredited GOHSENOL EG-05P factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | GOHSENOL EG-05P, a white granular PVA powder, is supplied in 20 kg multi-layer paper bags with inner polyethylene liner. |
| Container Loading (20′ FCL) | GOHSENOL EG-05P in 20′ FCL: packed in 25kg bags on pallets, shrink-wrapped and secured for safe transport. |
| Shipping | GOHSENOL EG-05P is a polyvinyl alcohol powder, non-hazardous and not regulated as dangerous goods for standard transport. Ship in sealed moisture-proof packaging to prevent clumping. Avoid high humidity, direct sunlight, and excessive heat. Handle with care to minimize dust generation and keep containers dry during transit. |
| Storage | Store GOHSENOL EG-05P in a cool, dry, well-ventilated area away from heat, ignition sources, and direct sunlight. Keep the container tightly closed to prevent moisture absorption and contamination. Avoid dust accumulation; use appropriate ventilation and handling precautions. Maintain stable temperatures and protect from physical damage to preserve product quality. |
| Shelf Life | Shelf life: 2 years when stored in original containers under cool, dry conditions, away from moisture and heat. |
In vinyl acetate/ethylene and vinyl acetate/VeoVa latex polymerisation, GOHSENOL EG-05P is introduced as the primary protective colloid at 3.0–6.0 wt% on total monomer when a low-viscosity high-solids dispersion is required. The powder is dissolved to 10–12 wt% solids in demineralised water in a jacketed dissolver at 80–85°C; a clear solution is expected within 60–90 min, after which the batch is cooled to 45–55°C and adjusted to pH 5.0–7.0 with sodium bicarbonate. The grade’s degree of hydrolysis is 86.5–89.0 mol% according to ISO 15023-2, leaving residual acetate groups that are critical for interfacial activity; surface tension of a 4% aqueous solution at 20°C is typically recorded at 50–55 mN/m by DIN EN 14370. In a pressure-rated stirred-tank reactor with an anchor impeller tip speed of 1.0–1.5 m/s, ethylene is fed to maintain 10–30 bar partial pressure, while potassium persulfate at 0.06–0.12 wt% on total monomers initiates polymerisation at 60–70°C. Finished dispersion control uses ISO 3251 for solids, ISO 976 for pH, and ISO 2555 for Brookfield RVT apparent viscosity at 20 rpm and 25°C; the target is typically 2,000–8,000 mPa·s, and values above 10,000 mPa·s are corrected by reducing EG-05P addition or increasing the pre-emulsion water fraction. Coagulum is screened through a 150 µm stainless mesh and kept below 0.05 wt% of wet latex; field data indicate that coagulum excursions rise when powder ash exceeds 0.5 wt% or when the stock solution is held above 85°C for more than 2 h and undergoes progressive deacetylation. If storage relative humidity exceeds 60%, fluidised-bed pre-drying at 50–60°C for 30 min is applied before feeding to prevent hopper bridging. The latices are used in interior architectural paint binders, heat-seal coatings and nonwoven saturation lines, where minimum film-forming temperature after coalescent addition is set below 0°C.
Paper coating colour formulation uses EG-05P at 0.2–1.2 dry parts per 100 parts of pigment, typically as a partial replacement for oxidized starch in wood-free and lightweight coated grades. The low solution viscosity of 4.8–5.8 mPa·s at 4% solids by ISO 1652:2020 allows total colour solids to be raised from 64–66% to 68–70% while retaining Brookfield spindle 3 viscosity at 100 rpm between 1,200 and 1,600 mPa·s. This viscosity window is practical for high-speed coaters operating at 1,100–1,400 m/min; the shear-thinning behaviour under a bent-blade metering element with blade angle 25–35° and backing roll hardness 75–85 Shore D controls dry coat weight at 8–12 g/m² per side. pH is held at 8.5–9.5 with ammonia or sodium hydroxide; EG-05P is stable at this pH with ground calcium carbonate but gels in the presence of borate-based insolubilizers above 0.05% borate on PVA solids. Coated paper is tested for water absorptiveness by TAPPI T 441 with Cobb 60 s, and surface roughness is measured by ISO 8791-2. End products are sheet-fed offset and rotogravure papers, in which the binder reduces binder migration and provides print gloss without the viscosity drift caused by oxidized starch retrogradation.
| Parameter | Practical range | Test or standard reference |
| Coating colour pH | 8.5–9.5 | ISO 976 |
| Coating colour solids | 66–70% | ISO 3251 |
| Brookfield viscosity at 100 rpm | 1,200–1,600 mPa·s | ISO 2555 |
| Cobb 60 s water absorption | 20–35 g/m² depending sheet grade | TAPPI T 441 |
| Parker PrintSurf roughness | 0.9–1.2 µm | ISO 8791-2 |
| Dry coat weight per side | 8–12 g/m² | On-line beta gauge |
EG-05P films used for gummed paper and envelope seams show rewet adhesion only when the water-sensitive polymer phase is not crosslinked by residual borate or glyoxal. The adhesive is formulated at 8–12 wt% EG-05P in demineralised water, heated to 85–90°C for 30–45 min under low-shear agitation to avoid fine gel particles; after cooling to 50°C, glycerol or sorbitol is added at 5–15% of PVA solids to depress film embrittlement below 0°C. Reverse gravure coating at 40–55°C applies a wet film of 10–20 g/m², which dries to 1.5–3.0 g/m² in a tunnel with staged air temperatures of 80°C/100°C/110°C. Coated sheets are conditioned at 23°C and 50% RH for 24 h before block testing; rewet peel is measured by ASTM D1876 after applying 10 µL/cm² of demineralised water. Sodium tetraborate decahydrate at 0.02–0.05% of wet adhesive increases cohesive strength and wet tack, but at 0.08% and above the film crosslinks and loses rapid rehydration; glyoxal at 2–5% on PVA solids is incompatible in this application because it produces water-resistant films. The adhesive is used for labels, security envelopes and mounting sheets with rewet open times of 10–40 s; indirect food-contact uses are assessed under FDA 21 CFR 175.105. Storage of coated stock over 70% RH causes blocking, so the coated paper is wrapped in moisture-barrier packaging and held at 23±2°C.
On water-jet and rapier weaving machines the size formula is prepared at 6–9% total dry solids, using EG-05P as the synthetic binder fraction at 20–40 parts per 100 parts of modified starch; the binder level rises to 45 parts for high-density polyester filament warps with 8,000–10,000 ends. The low solution viscosity of 4.8–5.8 mPa·s at 4% solids keeps the size-box bath stable at 60–65°C, and the slasher’s two-squeeze mangle is set at 3–5 kN/m nip pressure to achieve 9–12% dry add-on on spun cotton yarn. Drying is carried out over 7–9 steam-heated cylinders at 110–130°C; sized yarn tests follow ASTM D2256 for tensile strength and ASTM D3885 for flexural abrasion, with weaving efficiency monitored by loom stops per 100 m of warp. The end products include cotton/polyester shirting, denim and upholstery; desizing is by hot-water or enzymatic treatment at 70–80°C. Size film tack above 70% RH is controlled by adding a wax dispersion at 0.3–0.8% of dry solids.
Slip preparation for dry-pressed alumina tiles uses EG-05P as a temporary organic binder at 0.8–1.5 wt% of dry ceramic powder, added as a 5–8% aqueous solution after ball milling to avoid high local binder concentration. The grade’s ash content below 0.5% is the controlling parameter; higher ash contributes sodium and iron residuals that lower fired flexural strength measured by ASTM C1161. Spray drying through a rotary atomizer at inlet 180–220°C and outlet 85–105°C produces granules with median size 50–150 µm; binder migration to the granule surface raises crush force to 1–3 N and enables uniform die filling. Uniaxial pressing at 30–40 MPa gives green density 2.10–2.25 g/cm³ for alumina bodies; debinding in air at 1–2 K/min to 450°C with 60 min soak leaves residual carbon below 0.05 wt%. The grade is used in alumina substrates, spark plug insulators and wear-resistant tiles. Published data for EG-05P in lithium iron phosphate cathode slurries is limited; solvent-based NMP systems are not compatible.
In suspension polymerisation of vinyl chloride, EG-05P is combined with a higher-hydrolysis PVA primary dispersant at total dispersant loadings of 0.04–0.10 phr on monomer, with EG-05P forming 20–35% of the total package. The partial hydrolysis 86.5–89.0 mol% modifies interfacial tension during the polymerisation, yielding S-PVC grains with plasticizer absorption of 25–35 parts DOP per 100 parts resin by ISO 4608. Reactor operation uses demineralised water at 120–140 parts per 100 parts vinyl chloride, stirring at 250–350 rpm with a Pfaudler-style impeller, and polymerisation temperature 57–65°C corresponding to K-value 66–70 measured by ISO 1628-2. The residual dispersant is controlled by hot-water washing; the dried resin is screened at 63 µm, and bulk density is measured by ASTM D1895. The suspension is used for rigid pipe, window profile and calendered sheet formulations, where grain morphology influences extrusion gelation and melt homogeneity.
| Component or parameter | Practical range | Standard or equipment |
| Vinyl chloride monomer | 100 parts | Purity 99.99% |
| Demineralised water | 120–140 parts | Conductivity <5 µS/cm |
| EG-05P secondary dispersant | 0.010–0.035 parts | ISO 15023-2 |
| Primary high-hydrolysis PVA | 0.030–0.065 parts | ISO 15023-2 |
| Peroxide initiator | 0.05–0.10 parts | Active oxygen content |
| Polymerisation temperature | 57–65°C | K-value 66–70 |
| Reactor pressure | 8–11 bar | Pressure transmitter |
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GOHSENOL EG-05P is supplied as a granular powder of partially hydrolysed polyvinyl alcohol. The product specification includes a 4% aqueous solution viscosity of 4.8–5.8 mPa·s at 20°C measured under JIS K6726, and a degree of hydrolysis of 86.5–89.0 mol%. Volatile content is controlled to ≤5.0%, ash to ≤0.5%, and solution pH to 5.0–7.5. Because the hydrolysis degree remains below 90 mol%, the polymer hydrates in cold water under high shear and forms films with reduced crystallinity after drying. The low solution viscosity indicates a low molecular weight relative to other GOHSENOL grades; this property controls the grade’s selection in applications where shear viscosity, re-wetting speed, or emulsion reactor viscosity must remain low.
The residual acetate groups within the 86.5–89.0 mol% vinyl alcohol unit content disrupt interchain hydrogen bonding after film drying. This leaves sufficient hydroxyl functionality for adhesion to cellulose and mineral pigments while preventing the dense crystalline packing seen with fully hydrolysed polyvinyl alcohol. The consequence is a dried film that re-wets more readily than a 98–99 mol% grade, while sacrificing part of the tensile strength and water resistance of the fully hydrolysed polymer.
For solution preparation, EG-05P is metered into the vortex of a high-speed disperser in water at 25–30°C before steam or jacket heating to 60–70°C. The slurry is held for 30–45 min to complete hydration. Overheating above 80°C can cause granule surface gelation and lump formation. Filtration through 100–150 µm screens is recommended before metering in size press or coating applications. Solutions held at 20–25°C for more than 24 h require biocide protection because partially hydrolysed polyvinyl alcohol is biodegradable.
On a metered size press running starch-PVOH surface size, the low viscosity of EG-05P allows higher formulation solids without exceeding the pressure limit of the metering rod or blade. The viscosity is measured at low shear; in transfer roll nips, extensional viscosity also influences film split. Low-molecular-weight PVOH solutions remain Newtonian over a wider shear range than high-molecular-weight grades, so shear heating and pressure-driven viscosity drop are less pronounced. This improves runnability but does not necessarily improve film split. Published full-scale data for EG-05P on high-speed metered size presses are limited; mill experience indicates that replacing a 20 mPa·s grade with EG-05P reduces doctor blade deposit and misting at the applicator roll, but the wet film is more susceptible to thinning on porous raw stock.
The main processing constraint is surface strength development. Under TAPPI T 530, surface sizing agents are evaluated by pick strength of the dried sheet. A low-viscosity PVOH can produce a discontinuous binder film if the coat weight is too low or if the sheet porosity withdraws water before film formation. To avoid this, EG-05P is usually blended with oxidised or cationic starch at ratios between 1 and 5 parts PVOH per 100 parts starch solids. At addition levels above 5 parts, the solution viscosity remains manageable, but the dry film may become too water-sensitive unless sizing agents or insolubilisers are added.
The lower viscosity also imposes a limit on holdout. In size press applications requiring oil and grease holdout, a purely low-molecular-weight PVOH film may lack the film cohesion needed to block penetration. Formulators therefore add fluorochemicals or acrylic latexes when barrier performance is required; the role of EG-05P in such systems is adhesion promotion and film formation rather than barrier function.
Unlike fully hydrolysed polyvinyl alcohol, EG-05P does not require heating above 80°C to complete dissolution. The partially hydrolysed structure reduces crystallinity in solution and in the dried film, which is the basis for its use in remoistenable adhesive formulations. However, the same property increases water sensitivity and limits use in wet-end papermaking where retention and water resistance are critical.
In remoistenable adhesive compounding, EG-05P takes advantage of fast cold-water re-wetting. The dried adhesive layer is applied by gravure, roller, or slot die at solids from 10% to 30%; the low solution viscosity permits clean gravure wiping and uniform coat weight. Because the hydrolysis range is 86.5–89.0 mol%, the film remains water-soluble without heating above 40°C, which is essential for envelope and label adhesives. However, this same water sensitivity means that the film softens under high humidity; blocking resistance is acceptable only when coat weight and paper porosity are controlled.
Humidity stability is a boundary condition. At relative humidity above 70%, dried EG-05P films absorb moisture and can develop surface tack, causing blocking in stacked sheets. The effect is reversible by drying, but it limits the use of unmodified EG-05P in tropical packaging without moisture barriers or high-porosity paper.
When the end-use film must re-wet under low moisture availability, fully hydrolysed 98–99 mol% polyvinyl alcohol can form crystalline zones that retard water uptake. EG-05P, with 86.5–89.0 mol% hydrolysis, retains acetate groups that reduce crystallinity and permit faster water penetration. This difference is measurable by ISO 535 Cobb water absorption and by re-wetting time tests, although the specific re-wetting time depends on coat weight, paper type, and drying history. The trade-off is lower dry tensile strength and lower water resistance after drying.
Compared with higher-viscosity partially hydrolysed grades, EG-05P offers lower solution viscosity at equal solids. This permits higher solids application in gravure or slot-die coating without exceeding viscosity limits, reducing drying load. The lower molecular weight also reduces solution stringiness, which can improve transfer roll release but weakens the adhesive film’s wet tack on vertical surfaces. For non-vertical paper-to-paper bonding, EG-05P alone is generally sufficient; for carton side-seam adhesives with high initial tack requirements, a blend with a higher-viscosity PVOH is required.
Blade coating of porous paperboard imposes a lower viscosity limit below which the coating formulation drains into the substrate before immobilisation. EG-05P at low addition levels provides only limited water retention because its low molecular weight contributes little to the low-shear viscosity of pigmented coatings. In pigmented coating colours containing clay or calcium carbonate, water retention must be supplied by starch, carboxymethylcellulose, or high-molecular-weight PVOH. Without these additives, blade-coating defects include binder depletion at the surface and low pick strength, measured by TAPPI T 499 or IGT pick tests.
The grade is therefore used as a secondary binder and viscosity stabiliser rather than as the primary water-retention agent. In addition, the partially hydrolysed structure improves adhesion to coated paper and reduces dusting, but the dosage is typically kept below 1.5% of pigment weight because higher levels increase coating colour viscosity only slightly and may increase water sensitivity of the finished sheet.
During vinyl acetate emulsion polymerisation, partially hydrolysed polyvinyl alcohol acts as a protective colloid at the monomer-water interface. EG-05P reduces reactor viscosity relative to higher-molecular-weight protective colloids because the water-phase chain length is shorter. This permits higher monomer conversion before mixing torque becomes limiting. In a jacketed reactor with an anchor impeller at 80 rpm, a high-viscosity PVOH grade can raise bulk viscosity above 2,000 mPa·s at intermediate conversion; EG-05P extends the operating window and can support final solids above 55% in fine-particle emulsion systems. Particle size distribution measured by ISO 22412 depends on stirring, feed rate, and PVOH concentration, not solely on PVOH viscosity.
The hydrolysis range influences grafting of vinyl acetate onto the PVOH backbone. Partially hydrolysed PVOH contains acetate groups that participate in radical transfer and can become grafted, altering the stabilisation efficiency and water sensitivity of the dried emulsion film. Because the molecular weight is low, EG-05P provides less steric stabilisation for coarse emulsions above 1,000 nm; it is therefore suited to fine and medium particle-size emulsions rather than as the sole stabiliser for large-particle dispersions.
In textile warp sizing, EG-05P is applied from a 6–8% solution at 50–60°C by size box or kiss roll. The low viscosity promotes yarn bundle penetration without excessive surface film, which is useful for fine-count cotton and polyester-cotton yarns. Desizing is performed with hot water at 80–90°C because the partially hydrolysed polymer remains water-soluble after drying. The film strength is lower than that of medium-viscosity PVOH, so the grade is often combined with starch or acrylic binders when high-speed weaving requires maximum yarn abrasion resistance.
At high loom speeds, the low molecular weight can limit sized warp strength development. Weaving trials have shown that EG-05P alone may be sufficient for low-twist staple yarns, but for continuous-filament yarns or high-abrasion fabric constructions, a higher-viscosity PVOH or starch blend is necessary to maintain weaving efficiency.
Regulatory status for EG-05P should be confirmed against the specific food-contact application. Polyvinyl alcohol of this type is referenced for use as a component of paper and paperboard intended for aqueous and fatty food contact under FDA 21 CFR 176.170 and FDA 21 CFR 176.180, and as an adhesive component under FDA 21 CFR 175.105. These regulations are conditional, not blanket approvals; the finished paper or board must meet extraction limits applicable to the intended food type. The user should also confirm compliance with Framework Regulation EC 1935/2004 for paper and board intended for food contact in the European Union.
For industrial non-food applications, the polymer itself is generally exempt from EU REACH registration under the polymer exemption, but monomers and manufacturing additives must be registered. Formulated products must be reviewed for SVHC concentrations above 0.1% w/w and for applicable RoHS restrictions under Directive 2011/65/EU if the finished article enters electrical and electronic equipment. The user is responsible for verifying that the selected grade is listed or cleared for the intended jurisdiction and food type.
