| HS Code | 812656 |
| Product Name | GOHSENOL EG-30PW |
| Chemical Name | Polyvinyl Alcohol |
| Cas Number | 9002-89-5 |
| Appearance | White powder or granules |
| Degree Of Hydrolysis | 86.5 - 89.0 mol% |
| Viscosity 4pct Solution 20c | 28.0 - 34.0 mPa·s |
| Ph 4pct Solution | 5.0 - 7.0 |
| Volatile Content | ≤ 5.0 wt% |
| Ash Content | ≤ 0.5 wt% |
| Specific Gravity | 1.27 - 1.31 |
| Average Degree Of Polymerization | Approximately 2000 |
As an accredited GOHSENOL EG-30PW factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | GOHSENOL EG-30PW is supplied in 25 kg multi-wall paper bags with an inner polyethylene liner, protecting the powder from moisture. |
| Container Loading (20′ FCL) | 20′ FCL loading: GOHSENOL EG-30PW in 25kg bags on pallets, shrink-wrapped, stowed securely to prevent shifting during transit. |
| Shipping | GOHSENOL EG-30PW (polyvinyl alcohol) is a non-hazardous, water-soluble resin powder. Ship in dry, sealed containers to prevent moisture absorption. No special dangerous-goods classification applies for road, sea, or air transport, though standard industrial handling and protection from humidity are recommended during transit. |
| Storage | Store GOHSENOL EG-30PW in a cool, dry, well-ventilated area away from heat, sparks, open flames, and direct sunlight. Keep the container tightly closed to prevent moisture absorption and contamination. Avoid dust accumulation and contact with incompatible materials. Follow local regulations and manufacturer guidelines for safe storage and handling. |
| Shelf Life | Shelf life is typically 24 months when stored in a cool, dry place, avoiding moisture and direct sunlight. |
GOHSENOL EG-30PW is a partially saponified polyvinyl alcohol powder with a 4% aqueous solution viscosity of 28.0–32.0 mPa·s at 20 °C and a degree of hydrolysis of 86.5–89.0 mol%, measured in accordance with JIS K6726:1994. The residual acetyl content reduces crystallinity relative to fully hydrolysed grades, extends cold-water dispersibility, and suppresses gel formation under high-shear emulsification. A 4% aqueous solution typically shows a pH of 5.0–7.0, volatile matter controlled below 5.0 wt%, and ash specified below 0.5 wt%. Those boundaries determine the application space: protective colloid, film former, surface sizing agent, temporary binder, and remoistenable adhesive base.
In vinyl acetate-ethylene (VAE) emulsion polymerisation, EG-30PW functions as the primary protective colloid at addition ratios of 2.0–5.0 wt% based on total monomer feed, with the most stable operating band centred near 3.5 wt% when ethylene pressure is maintained between 15–25 bar in a continuous stirred tank or high-pressure loop reactor. The partially hydrolysed structure supplies interfacial activity at the vinyl acetate/water interface while retaining sufficient chain length to generate a hydrated steric barrier around latex particles. This balance avoids the excessive graft-induced gel content seen with fully hydrolysed grades at the upper hydrolysis limit, but it also avoids the low colloidal stability of grades with hydrolysis below 80.0 mol%. On production-scale emulsification lines, a pre-dispersed 10–15 wt% aqueous solution of EG-30PW is charged into a reactor maintained at 60–80 °C with a redox initiation system, typically hydrogen peroxide or tert-butyl hydroperoxide combined with sodium formaldehyde sulfoxylate or ascorbic acid under Fe(II) catalysis. Ethylene is metered into the reactor to produce a copolymer with internal plasticisation, while the free PVOH content in the finished emulsion is usually 1.0–3.0 wt% of the dispersion. Residual vinyl acetate monomer is reduced below 0.1 wt% by a post-treatment initiator before letdown. The main failure mode in the letdown stage is shear-induced destabilisation when the emulsion is transferred through gear pumps and high-shear inline mixers; accumulation of coagulum on heat-exchanger plates and circulation-line walls is commonly associated with insufficient hydrocolloid protection. Maintaining a hydrolysis window of 87.0–89.0 mol% and controlling the temperature during letdown below 45 °C reduces this fouling tendency. Regulatory compliance for the resulting wood adhesive is assessed under EN 204:2016 for durability classes D3 and D4, with lap-shear specimens conditioned and tested according to EN 205:2016. Indirect food-contact use of the dried adhesive is evaluated under FDA 21 CFR 175.105 and EU Regulation (EC) No 1935/2004, while the PVOH substance is checked against substance inventory requirements under REACH and K-REACH where applicable. Finished emulsions are formulated with plasticisers, fillers, defoamers, and thickening agents to produce D3 interior wood adhesives, D4 exterior wood adhesives, paper-foil lamination adhesives, and removable pressure-sensitive adhesive base coats.
On a metered film press or a conventional puddle size press, EG-30PW is applied to paper and paperboard at 1.0–4.0 wt% in the size-press batch, with 2.0 wt% typical for uncoated wood-free paper and up to 4.0 wt% for high-holdout packaging grades where post-conversion water resistance is critical. The cooking sequence disperses the powder in cold water under moderate agitation before raising the temperature to 85–95 °C for 30–45 min to complete dissolution. The cooked solution is then cooled to 40–55 °C before application because higher temperatures lower solution viscosity to 12–20 mPa·s and improve film transfer uniformity at the roll nip. On production equipment, the dominant process variable is return-sump solids, not nip loading alone, because partially hydrolysed PVOH accumulates on metering rods and roll edges when return flow velocity falls below 0.5 m/s or when the solution is held above 70 °C for more than 4 hours. Skin formation and surface specks are the resulting defects. Regulatory boundaries for food-contact paper and paperboard are governed by FDA 21 CFR 176.170 for aqueous and fatty food contact and FDA 21 CFR 176.180 for dry food contact. Water absorptiveness of the finished surface is tested according to ISO 535:2023, with Cobb values set by the converter for the intended packaging or printing process. Overall migration in laminated structures is checked under EU Regulation (EU) No 10/2011 when the paper is used as a food-contact layer. Downstream coated papers include inkjet photo-base papers, thermal paper base sheets, release base papers, and folding-carton board where the PVOH layer reduces binder penetration and improves surface strength measured by ISO 3783:2006 as a pick resistance index.
In hospital laundering and infection-control workflows, a 25–40 µm cast film produced from EG-30PW is formulated with 12–22 wt% plasticiser on dry PVOH, typically glycerol or sorbitol, and 0.5–2.0 wt% release modifier to prevent blocking. The PVOH content remains 70–85 wt% of the dry film. Published dissolution data for EG-30PW in a fixed laboratory stirrer configuration is limited; industrial qualification therefore uses a fabric-load dissolution test inside the target washing machine rather than a fixed time criterion alone. The operational requirement is that the film must retain sufficient wet strength for 3–5 minutes of handling before dissolution in a 60–85 °C wash cycle. At 20 °C the film typically begins to disintegrate within 40–90 seconds depending on film thickness, soiled-fabric load, and mechanical agitation, while at 40 °C complete dissolution is often reached within 30–60 seconds under the same agitation. On industrial casting lines, a 14–18 wt% aqueous solution of EG-30PW is deaerated under vacuum at 300–500 mbar and cast onto a chromium-plated steel belt heated to 85–105 °C. The film is dried to 8–12% residual moisture and wound with an anti-static bar because low-moisture PVOH film is susceptible to blocking in high-humidity storage and embrittlement below 7% moisture in low-humidity storage. Regulatory controls applicable to this configuration include EU Regulation (EU) No 10/2011 where the material may be part of packaging, FDA 21 CFR 177.1670 for the polyvinyl alcohol component in food-contact films, and REACH for downstream user communication. Infection-control laundry facilities are usually validated under EN 14065:2016 for textile bio-contamination control rather than under a film-specific product standard. End-product types include cold-water-soluble laundry bags for soiled hospital linen, pigmented identification films for cleanroom garments, water-soluble transfer release films for embroidery, and temporary protective packaging for agricultural seed strips where the dissolved PVOH film must leave no visible residue after irrigation.
Remoistenable adhesives for envelope flaps, stamps, and paper labels are produced by dispersing EG-30PW at 10–20 wt% in a water/plasticiser mixture containing glycerol or sorbitol at 5–15 wt% of the PVOH weight. The adhesive is roll-coated at 40–60 °C and dried to a clear, non-blocking film that is re-activated by contact with water in mailing or labelling equipment. Process control focuses on coating solids, wet film thickness, and the plasticiser-to-PVOH ratio because excess plasticiser causes blocking in stacked envelopes during storage, whereas insufficient plasticiser produces a brittle film that fractures at the flap fold. Compliance is evaluated under FDA 21 CFR 175.105 for indirect food contact through envelopes used adjacent to dry food packaging, and under EU Regulation (EC) No 1935/2004 for general packaging material safety. Adhesive film integrity after drying is tested by water-reactivation tack and bond strength using ISO 11339:2022 for T-peel specimens. End products are envelope flaps, paper stamps, label interliners, and dry-stick adhesive patches for packaging folders. Published data for exact open-time limits of EG-30PW in a standardised remoistenable adhesive formulation is limited; therefore, industrial qualification is performed on the target envelope substrate rather than through a single adhesive test method.
For aqueous ceramic tape casting of alumina and low-temperature co-fired ceramic (LTCC) powders, EG-30PW is dissolved into the binder phase at 1.0–4.0 wt% of the dry ceramic powder, with the lower end used for submicron alumina powders that require low-viscosity slurries and the upper end for coarse composite formulations where green strength must exceed 1.5 MPa after drying. The slurry is ball-milled with a polyelectrolyte dispersant, deaerated under vacuum, and cast through a doctor blade at a gap of 100–500 µm onto a polyester carrier film. Drying is carried out between 60–90 °C, after which the green tape is slit, laminated, punched, and sintered. Published data for EG-30PW in this specific configuration is limited; formulation screening therefore uses a factorial design with binder level, plasticiser level, and powder solids because the specific adsorption of PVOH onto alumina surfaces depends on slurry pH and the dispersant type. No single global standard defines green tape tensile strength; converter qualification normally references internal bending-mandrel tests and final substrate standards such as IPC-2221 for printed board design and RoHS Directive 2011/65/EU for restricted substances. The PVOH component is subject to REACH. End-product types include alumina substrates, LTCC multilayer modules, dielectric layers for capacitors, and temporary ceramic greenware where the binder must leave low ash after burnout.
When EG-30PW is combined with native corn starch, oxidised starch, or acetylated starch in a jet cooker for warp sizing, PVOH addition is set between 4.0–10.0 wt% of the total size solids, while total size solids in the size box are maintained at 8.0–14.0 wt% depending on yarn count and loom type. The jet cooking system injects live steam to reach 110–135 °C for 15–30 minutes under pressure, after which the liquor is transferred to a storage kettle at 80–90 °C and supplied to the slasher size box. Partially hydrolysed EG-30PW contributes film adhesion to cotton and polyester-cotton yarns, but its solution stability is compromised above 130 °C if the pH drops below 4.0 through starch acid hydrolysis; in such cases, a buffer is used to keep the cooking pH between 6.0–7.5. On production slashing lines, the main failure mode is size-shedding accumulation on reed wires and drop wires when the size film lacks flexibility at low loom-room humidity. The residual acetyl groups in EG-30PW reduce edge cracking, but formulations still require 0.5–1.5 wt% wax-based lubricant for high-speed air-jet looms above 800 rpm. Desizing is carried out with amylase for the starch fraction and hot-water washing at 80–90 °C for the PVOH fraction; spent size water is then treated by ultrafiltration or aerobic biological treatment before discharge. Compliance in denim and apparel supply chains is governed by OEKO-TEX Standard 100 for textile product safety, ZDHC MRSL 2.0 for chemical residues, and EU REACH for substance inventory. The final woven fabric is tested for fabric strength using ISO 13934-1:2013, while residual size removal is checked by iodine staining and solvent extraction methods rather than by a single universal standard. End-product types include woven shirting fabric, denim, bed linen, and technical canvas where clean desizing is required before bleaching and dyeing.
Competitive GOHSENOL EG-30PW prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8615380400285 or mail to sales2@liwei-chem.com.
We will respond to you as soon as possible.
Tel: +8615380400285
Email: sales2@liwei-chem.com
Flexible payment, competitive price, premium service - Inquire now!
The GOHSENOL EG-30PW grade is a partially saponified poly(vinyl alcohol) (PVOH) powder supplied under the GOHSENOL EG-series nomenclature. The grade designation places the material in the EG series for emulsion-polymerisation and water-soluble binder applications, with a nominal viscosity class of 30 mPa·s at 4% aqueous concentration and 20°C. Manufacturer-published lot-release limits specify a viscosity of 28.0–32.0 mPa·s and a degree of hydrolysis of 86.5–89.0 mol%. The residual acetyl content in this hydrolysis range reduces intra- and inter-chain hydrogen bonding relative to fully hydrolysed PVOH grades, which lowers minimum make-down temperature and improves compatibility with hydrophobic polymer particles. The powder is received as a white free-flowing solid and is controlled for volatile content, ash, and solution pH. Table 1 summarises the principal release parameters.
| Property | Condition / Method | Typical release range |
|---|---|---|
| Appearance | Visual inspection | White free-flowing powder |
| Degree of hydrolysis | JIS K6726; ISO 15023-1 designation basis | 86.5–89.0 mol% |
| Viscosity | 4% aqueous solution, 20°C; JIS K6726 / Brookfield rotational viscometer | 28.0–32.0 mPa·s |
| pH | 4% aqueous solution, 20°C | 5.0–7.0 |
| Ash as Na₂O | JIS K6726 | ≤0.4 wt% |
| Volatile content | JIS K6726 | ≤5.0 wt% |
Lot acceptance is normally verified by rotational viscometry on a 4% aqueous solution prepared according to JIS K6726, supported by infrared spectroscopy or titration for residual acetyl content. For bulk storage, the powder should be kept in sealed containers at ≤30°C and ≤60% relative humidity. Cyclic moisture ingress on unheated warehouse floors has been associated with caking and reduced free-flow character, particularly when bags are opened in high-humidity environments and re-sealed without desiccant protection.
In vinyl acetate emulsion polymerisation, GOHSENOL EG-30PW functions primarily as a protective colloid. The 28.0–32.0 mPa·s viscosity band corresponds to an intermediate molecular weight, and when the grade is dissolved at 5.0 wt% of monomer mass in a 10 m³ jacketed reactor fitted with an anchor impeller at 90 rpm, the aqueous phase develops sufficient viscosity to reduce particle coalescence during nucleation without generating excessive main-agitator torque. The stabilisation mechanism involves grafting of PVOH onto poly(vinyl acetate) chains at the monomer–water interface. Because the 86.5–89.0 mol% hydrolysis range leaves a measurable fraction of residual acetate groups, the polymer is less hydrophilic than fully hydrolysed grades and occupies a larger interfacial area at the droplet surface. This modifies particle nucleation and suppresses large primary-particle formation. Particle size distributions measured by laser diffraction according to ISO 13320 for vinyl acetate homopolymers in this viscosity class commonly show a volume-median diameter near 1.0 µm, although initiator feed profile, agitation rate, and monomer addition mode can shift the median upward by 0.3–0.5 µm.
Lower-viscosity homologues such as EG-05PW provide less coalescence resistance and may generate higher coagulum in unoptimised high-shear lines. Higher-viscosity grades such as EG-40PW can increase reactor torque and reduce heat-transfer rates through the jacket. EG-30PW therefore occupies the intermediate range where emulsion stability is improved without sacrificing heat removal capacity. In continuous monomer-feed reactors, the grade also reduces foam height relative to fully hydrolysed PVOH because the residual acetate groups alter surface elasticity of the aqueous phase. The effect is most pronounced during the initial 20–30 min of seeding, when particle number density is being established.
In jacketed make-down vessels with high-shear dispersion equipment, EG-30PW is first slurried in water at 20–30°C and then heated. A Cowles-type disperser operating at 1,200–1,500 rpm prevents particle agglomeration during wetting. After complete powder wetting, the batch is heated to 80–85°C and held for 30–45 min. Prolonged exposure above 95°C accelerates hydrolysis of residual acetate groups and can shift the dissolution and compatibility behaviour of the grade. The resulting solution is filtered through a 100-mesh stainless-steel screen before transfer to the emulsion reactor or coating kitchen. Rapid addition of dry powder to hot water causes fish-eye gel formation; controlled addition into a cold slurry followed by uniform heating limits undissolved gel content to below 0.1 wt% under normal conditions. Prepared solutions without preservative should be used within 48–72 h at 20–25°C, because PVOH solutions support microbial growth and develop pH drift.
In vinyl acetate-ethylene copolymer reactors, EG-30PW is typically evaluated at 4.0–6.0 wt% of monomer mass, often in combination with non-ionic surfactants. The partial hydrolysis range of 86.5–89.0 mol% gives a wider processing window than fully hydrolysed PVOH grades because lower hydrogen bonding density improves compatibility with ethylene-modified polymer chains. However, medium viscosity alone is not sufficient to maintain colloidal stability at very high solids contents above 65 wt%. For such formulations, a higher-viscosity protective colloid or an anionic surfactant adjunct is normally required. In acrylic copolymer systems, EG-30PW competes with conventional surfactant micellar nucleation. It is less surface-active than anionic surfactants, so the initial nucleation rate is reduced, but mechanical stability after polymerisation is improved. Reactor fouling is generally lower than with fully hydrolysed PVOH, but calcium-ion tolerance is reduced in hard-water make-down. Water hardness above 150 ppm CaCO₃ can produce cloudiness and may require a sequestrant such as tetrasodium EDTA.
Published data for specific acrylic reactor configurations using EG-30PW is limited. The main process conflict arises when ethylene content exceeds 15 wt% in vinyl acetate-ethylene systems: the polymer becomes more hydrophobic, and the partially hydrolysed PVOH can show lower grafting efficiency at the particle interface. In such cases, the addition of 2.5 wt% EG-30PW relative to monomer mass has been reported as a starting point for machine trials, but the final thickening response and coagulum level must be established on the production line because agitator geometry and jacket heat-transfer area differ across plants.
The comparative differences among EG-series grades become measurable in paper coating and textile warp sizing. Table 2 lists the adjacent viscosity classes and the observed downstream effect of grade substitution. In paper coating formulations, replacing EG-05PW with EG-30PW increases aqueous-phase viscosity and wet pick resistance, but higher viscosity may reduce coating solids at the same blade speed. In textile warp sizing, EG-30PW forms films with tensile strength higher than EG-05PW and lower than EG-40PW. Film elongation is inversely related to molecular weight. Warp sizing compositions based on EG-30PW are typically prepared at 8–12 wt% solids and applied on multi-cylinder slashers at 65–75°C. The intermediate molecular weight reduces size migration during drying compared with low-viscosity grades, but excessive add-on can cause brittleness in high-twist yarns.
| Grade | Nominal viscosity band at 4%, 20°C | Degree of hydrolysis | Observed downstream effect |
|---|---|---|---|
| EG-05PW | 4.5–5.5 mPa·s | 86.5–89.0 mol% | Lower aqueous viscosity; reduced coagulum control in high-shear emulsion reactors; lower film tensile strength |
| EG-30PW | 28.0–32.0 mPa·s | 86.5–89.0 mol% | Intermediate protective-colloid viscosity; improved mechanical stability without excessive reactor torque |
| EG-40PW | 40.0–46.0 mPa·s | 86.5–89.0 mol% | Higher low-shear viscosity; stronger wet film cohesion; may increase make-down time and reactor power draw |
Rheological response during high-shear dispersion, adhesive film formation, and ceramic binder burnout is governed by the molecular weight distribution and residual acetate content. In adhesive formulations, EG-30PW at 30–50 parts per 100 parts poly(vinyl acetate) solids contributes cohesive strength without excessive solution viscosity. Wet tack develops after water loss, and final bond strength is assessed by EN 204 for woodworking adhesives or ASTM D903 for peel resistance. In ceramic binder applications, the powder is dissolved at 3.0–5.0 wt% in deionised water and combined with alumina or zirconia slips. Green strength of pressed compacts increases with PVOH addition up to a plateau, beyond which further binder addition reduces fired density. Thermogravimetric analysis according to ISO 11358 shows complete binder decomposition between 450°C and 550°C under air, with residual ash below the lot release limit of 0.4 wt%. The medium viscosity of EG-30PW provides adequate green strength while maintaining slip fluidity at a shear rate of 100 s⁻¹; high-viscosity grades increase green strength but can cause lamination defects during spray drying.
Compliance of GOHSENOL EG-30PW with regional chemical inventories is documented under REACH, and the powder is not classified as hazardous under the CLP Regulation for the supplied physical form. RoHS compliance is limited to applications in which total PVOH content is not subject to the four heavy-metal restrictions; the product itself is not certificated as a food additive. Food-contact compliance must be evaluated by the finished-article manufacturer under 21 CFR 176.170 for paper and paperboard components, 21 CFR 175.105 for adhesives, or the applicable national measure. In pharmaceutical or biomedical contexts, the grade should not be used without confirming residual solvent and monomer levels against Ph. Eur. or USP monographs. The product is incompatible with strong oxidising agents, and gelation occurs in the presence of borate ions under alkaline conditions. Borax-compatible formulations should be designed at pH values below 8.0 or with alternate high-hydrolysis PVOH grades.
