| HS Code | 603277 |
| Product Name | GOHSENOL EG-05C |
| Chemical Type | Partially hydrolyzed polyvinyl alcohol |
| Cas Number | 9002-89-5 |
| Appearance | White to yellowish granular powder |
| Degree Of Hydrolysis | 87-89 mol% |
| Viscosity 4 Aqueous Solution 20 C | 4.5-6.0 mPa·s |
| Ph 4 Aqueous Solution | 5.0-7.0 |
| Volatile Matter | ≤5.0 wt% |
| Ash Content | ≤0.5 wt% |
| Average Degree Of Polymerization | Approximately 500 |
| Average Molecular Weight | Approximately 22,000-25,000 g/mol |
| Solubility | Soluble in hot water; practically insoluble in organic solvents |
As an accredited GOHSENOL EG-05C factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | GOHSENOL EG-05C polyvinyl alcohol is packaged as granules in 25 kg multi-ply paper bags, with polyethylene lining. |
| Container Loading (20′ FCL) | GOHSENOL EG-05C, polyvinyl alcohol, packed in 25kg bags on pallets, loaded into a 20′ FCL container for safe transport. |
| Shipping | GOHSENOL EG-05C, a polyvinyl alcohol resin, ships as free-flowing granules in multi-layer paper bags or bulk packaging. It is non-hazardous for transport under standard regulations. Keep containers sealed, dry, and away from moisture, heat, and direct sunlight. Handle gently to minimize dust and protect packaging integrity during transit. |
| Storage | Store GOHSENOL EG-05C in a cool, dry, well-ventilated area away from direct sunlight and sources of heat. Keep the container tightly sealed to prevent moisture absorption, as the product is hygroscopic. Avoid storage near strong oxidizing agents. Maintain stable temperatures and low humidity to preserve quality and prevent caking or degradation. Use proper labeling and keep out of reach of unauthorized personnel. |
| Shelf Life | Shelf life is approximately 2 years when stored unopened in a cool, dry place away from moisture. |
In suspension polymerisation of vinyl chloride, GOHSENOL EG-05C operates as the primary droplet stabiliser for the aqueous monomer suspension loop. The grade is a low-viscosity partially alcoholyzed polyvinyl alcohol with a 4% aqueous solution viscosity of 4.8–5.8 mPa·s at 20°C and a degree of hydrolysis of 86.5–89.0 mol%. In production-scale reactors of 50–120 m³ working volume fitted with jacket cooling, reflux condenser and Pfaudler retreat-curve impellers, the dispersant solution is prepared at 1.0–3.0 wt% in deionized water at 60–80°C, cooled to 35–45°C, and metered into the aqueous phase before vinyl chloride monomer charging. Typical aqueous-phase concentrations for primary polyvinyl alcohol stabilisers in this viscosity band fall between 0.03 wt% and 0.10 wt% relative to water; the exact operating point is adjusted against impeller tip speed and condenser load rather than held fixed. Below this range, monomer droplet size distribution shifts above 150 µm and reactor wall fouling increases; above this range, PVC plasticizer absorption falls and residual monomer stripping becomes slower. The polymerisation is controlled at 52–62°C under autogenous pressure, with conversion terminated at 80–90% to limit porosity and thermal instability. The resultant PVC resin is characterised by K-value 55–68 according to ISO 1628-2, bulk density 0.48–0.62 g/mL, and plasticizer absorption 18–30 g DOP per 100 g resin according to ISO 4608. Terminal products include rigid pipe and profile compounds, vinyl flooring, and cable insulation compounds where grain morphology and dry-up rate control downstream extrusion output. Published data for EG-05C-specific droplet size distribution at a given impeller Reynolds number is limited; plant trials should be used to set the final dispersant concentration.
In vinyl acetate-ethylene (VAE) emulsion polymerisation, GOHSENOL EG-05C acts as protective colloid and continuous-phase viscosity regulator. The reaction is run in high-pressure stirred reactors rated for ethylene partial pressures of 20–80 bar and temperatures of 60–120°C, with initiator systems based on sodium persulfate and a reducing agent such as sodium metabisulfite. The PVA fraction is dissolved at 4–10 wt% in the aqueous feed at 70–90°C and introduced as a continuous or semi-continuous stream with vinyl acetate monomer over 3–6 hours. Protective colloid loadings from 2 wt% to 6 wt% based on vinyl acetate monomer are typical; below 2 wt% the emulsion becomes shear-unstable and coagulum retained on a 100-mesh filter can exceed 0.10 wt%, while above 6 wt% final Brookfield viscosity can rise above 8,000 mPa·s at 25°C and reduce transfer-pump efficiency. The low solution viscosity of this grade permits final solids contents of 55–65 wt% without exceeding 5,000 mPa·s at 25°C, a processing window that high-DP partially hydrolysed PVA grades do not reliably maintain. Final emulsions are buffered to pH 4.0–5.5 with acetic acid or sodium acetate, tested for viscosity according to ISO 2555, and filtered through 45 µm and 100 µm bag filters. Alkaline amine additives should not be used for pH adjustment because a drift above pH 6.0 can hydrolyse residual acetate groups and increase coagulum. Terminal products include structural wood adhesives formulated to EN 204/205 D3/D4, paper-to-paper laminating adhesives for food packaging under FDA 21 CFR 175.105, and nonwoven binders for air-laid disposable textiles. Published data for EG-05C-specific coagulum response to ethylene pressure is limited; the loadings above are operating ranges reported for low-DP partially hydrolysed protective colloids in VAE processes.
When GOHSENOL EG-05C is combined with oxidised starch in an inclined-jet or rod-metering size press, the PVA is pre-dispersed at 5–10 wt% in water at 80–90°C and then dosed into the starch solution to give a size press working concentration of 1.0–3.0 wt% PVA and 5–12 wt% starch dry solids. The size press is operated at sheet speeds of 100–300 m/min, wet film pick-up of 100–250 g/m², and after-dryer temperatures of 90–120°C. The dried PVA-starch layer increases IGT pick resistance and reduces dusting during high-speed printing; surface strength is assessed according to ISO 3783:2014 and wax pick can be cross-checked with TAPPI T 459 om-20. Board and liner produced with EG-05C-containing size remain within food-contact margins when the final dry PVA weight is below 3 g/m², because polyvinyl alcohol is covered by FDA 21 CFR 176.170 as a sizing and co-binder component. Terminal papers include recycled white-top liner, folding carton board and release base paper where linting must be controlled at press speeds above 12,000 sheets/hour. Over-dosing of PVA above 3 wt% in the working solution should be avoided when the furnish contains high calcium carbonate filler, because the stiffened surface can crack during folding; published data for EG-05C-specific crack resistance in this configuration is limited.
For remoistenable adhesive coating on machine-finished kraft and envelope stock, GOHSENOL EG-05C is dissolved at 15–30 wt% in deionized water at 60–80°C and applied by slot-die or reverse-roll coater at 15–35 g/m² dry coat weight. The coating line is run at 50–150 m/min with three-zone drying at 60–110°C and final web moisture held at 3–5% to prevent blocking in mill rolls. Because the grade has a 4% solution viscosity of 4.8–5.8 mPa·s at 20°C, a 25 wt% solution remains below 10,000 mPa·s at 60°C, permitting high-solids application without slot-die streak defects. Glycerol or sorbitol plasticiser is introduced at 3–10 wt% of PVA to reduce film brittleness after drying. The remoistening bond of the finished tape is evaluated by 180° peel adhesion under ISO 29862:2018 if the tape construction is within scope; blocking resistance is checked by a constant-load method after storage at 40°C/90% RH for 24 hours. Terminal products include gummed paper tape, envelope flaps, label stock and tamper-evident seals. Compliance with food-contact adhesive requirements is maintained under FDA 21 CFR 175.105; any finished package used for direct food contact must be revalidated at the converter level because the adhesive is only one component of the final laminate. Published data for EG-05C-specific peel strength on kraft substrates is limited.
Low-viscosity partially hydrolysed PVA is used in water-based ceramic tape casting because the polymer can be dissolved at 5–10 wt% in deionized water and incorporated into alumina, zirconia or barium titanate slurries at 1–3 wt% based on ceramic solids. The slurry is prepared by dispersing ceramic powder with an ammonium polyacrylate dispersant at 0.3–0.8 wt% on solids, adding the GOHSENOL EG-05C solution, and plasticising with glycerol or PEG 400 at 10–30 wt% of PVA. The slurry is de-aired under vacuum at 50–100 mbar and cast through a doctor blade with a gap setting of 100–500 µm onto a polyester carrier at 500–2,000 mm/min. Drying at 25–60°C leaves a flexible green tape with residual moisture below 1.5 wt%. Binder burnout is conducted in air at 350–550°C with a heating ramp of 0.5–1.5°C/min to prevent carbon residue; decomposition is monitored by thermogravimetric analysis according to ASTM E1131-20. Terminal components include LTCC substrate tapes, multilayer ceramic capacitors and piezoceramic elements where the green tape must maintain thickness tolerance of ±2–5 µm before lamination and sintering. If the binder system is exposed to amine-containing dispersants at pH above 9, premature hydrolysis can reduce green tape elongation; published data for EG-05C-specific green tape elongation in this configuration is limited.
| Downstream use | EG-05C role | Typical addition or process window | Key equipment or test | Standard or regulation |
|---|---|---|---|---|
| Vinyl chloride suspension polymerisation | Primary droplet stabiliser | 0.03–0.10 wt% of aqueous charge; reactor 52–62°C | Pfaudler retreat-curve impeller, jacketed autoclave 50–120 m³ | ISO 1628-2, ISO 4608 |
| VAE emulsion polymerisation | Protective colloid / viscosity regulator | 2–6 wt% on vinyl acetate monomer; final solids 55–65 wt% | High-pressure stirred reactor, ethylene 20–80 bar; Brookfield viscosity at 25°C | ISO 2555, EN 204/205 D3/D4 |
| Paper surface sizing | Pigment-free film former with oxidised starch | 1.0–3.0 wt% PVA; 5–12 wt% starch solids | Rod-metering size press, 100–300 m/min | ISO 3783:2014; FDA 21 CFR 176.170 |
| Remoistenable adhesive coating | Water-activated film former | 15–30 wt% solution; 15–35 g/m² dry coat weight | Slot-die or reverse-roll coater, 50–150 m/min | ISO 29862:2018; FDA 21 CFR 175.105 |
| Ceramic tape casting | Green tape binder | 1–3 wt% on ceramic solids; burnout 350–550°C | Doctor blade 100–500 µm gap; TGA | ASTM E1131-20 |
| Textile warp sizing | Abrasion-resistant warp size | 8–12 wt% solution; add-on 8–14 wt% on yarn mass | Slasher frame, squeeze 20–40 N/mm | ZDHC MRSL; REACH Annex XVII |
On high-speed slasher frames configured with 12-cylinder drying hoods and dual squeeze roll size boxes, GOHSENOL EG-05C is applied to polyester-cotton warps as part of an 8–12 wt% size solution at 70–90°C. Dry add-on is controlled at 8–14 wt% on yarn mass, with squeeze pressure set between 20 N/mm and 40 N/mm and drying cylinder temperatures staged from 90–130°C. The partially hydrolysed PVA film remains abrasion-resistant at loom speeds above 1,500 m/min, reducing warp yarn hairiness as measured on an Uster Tester 5 at 400 m/min and lowering shedding in the weaving shed. Desizing is carried out without enzymes in hot water at 80–95°C for 20–30 minutes, which removes the PVA film from greige fabric and permits size recovery by ultrafiltration; this is an operational boundary when the weaver requires zero formaldehyde and APEO-free processing. Terminal products include woven apparel fabric, furnishing fabric and automotive airbag base cloth where a clean, insoluble-residue-free warp size is required. Compliance with ZDHC MRSL and REACH Annex XVII is demonstrated through the absence of intentionally added alkylphenol ethoxylates; however, final fabric certification must be revalidated at the finishing mill. Published data for EG-05C-specific weaving efficiency on air-jet looms is limited.
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GOHSENOL EG-05C is a low-viscosity, partially hydrolysed poly(vinyl alcohol) resin supplied for aqueous stabilisation, film formation, temporary binding, and protective colloid applications. The grade is defined by a JIS K6726 specification envelope: a 4% (w/w) aqueous solution at 20 °C exhibits a viscosity of 4.8–5.8 mPa·s, with degree of hydrolysis 86.5–89.0 mol%, pH 5.0–7.0, volatile matter ≤5.0 wt%, and ash ≤0.5 wt%. The residual acetyl content corresponding to the hydrolysis range is 11.0–13.5 mol%. That residual acetate distinguishes EG-05C from fully hydrolysed PVOH grades having degree of hydrolysis above 98 mol%. The suffix 05 places the product in the nominal 5 mPa·s viscosity class; the C suffix denotes the delivery form. Published particle-size-distribution data for C-specific material is limited; the manufacturer’s certificate of analysis should govern batch-level values.
| Parameter | Value | Test basis |
|---|---|---|
| Viscosity, 4% aqueous solution at 20 °C | 4.8–5.8 mPa·s | JIS K6726 |
| Degree of hydrolysis | 86.5–89.0 mol% | JIS K6726 |
| Residual acetyl content, calculated | 11.0–13.5 mol% | Derived from hydrolysis range |
| pH, 4% aqueous solution at 20 °C | 5.0–7.0 | JIS K6726 |
| Volatile matter | ≤5.0 wt% | JIS K6726 |
| Ash | ≤0.5 wt% | JIS K6726 |
Aqueous solution preparation for EG-05C is normally carried out by cold-water slurrying at 10–25 °C, followed by heating to 85–90 °C in a jacketed vessel with low-shear agitation. Powder addition through an eductor or high-shear wetting cone at 1,000–1,500 rpm minimises lump formation. After wetting, mixer speed is reduced to 100–300 rpm during the heated hold. Dissolution is typically complete within 30–60 min, but residual gel particles should be removed with a 250 µm bag filter when the solution is intended for gravure coating or transparent film applications. A dissolved batch is sampled after cooling to 20 °C; if the measured viscosity falls outside 4.8–5.8 mPa·s for a 4 wt% solution, concentration drift or polymer degradation should be investigated before use. Deaeration under vacuum at 50–100 mbar for 10–15 min is standard laboratory practice before viscosity determination.
High-shear dispersion accelerates wetting, but prolonged shear after dissolution can mechanically degrade the polymer chain and produce an irreversible loss of solution viscosity. A plant-scale control test is to measure Brookfield viscosity after a 20 min mixing hold; a loss greater than 5 % relative to the initial JIS K6726 value indicates excessive shear. The same hold test is applied when in-line rotor-stator mixers are used. Aqueous solutions are also vulnerable to microbial growth during ambient storage. When viscosity loss is not thermally induced, preservation with a registered biocide or storage at 5–10 °C is required. Solutions held above 90 °C for extended periods can undergo hydrolysis of residual acetate groups, shifting the degree of hydrolysis upward and changing solubility behaviour; therefore dissolution vessels are typically limited to 85–90 °C with a maximum hold of 60 min unless process validation supports a longer residence time.
In vinyl acetate and vinyl acetate-ethylene emulsion polymerisation, EG-05C is pre-dissolved to 10–20 wt% aqueous solution and charged at 2.0–5.0 parts per hundred parts monomer in laboratory reactor screening. The low solution viscosity of the grade permits higher solids handling at lower reactor torque than higher-viscosity PVOH grades. A jacketed glass-lined reactor with pitched-blade turbine agitation at 150–300 rpm and external heat-exchange circulation is typical. The lower chain length of EG-05C reduces monomer droplet coalescence under low-shear conditions, but it also reduces colloidal stability at high electrolyte loads. When polymerisation is conducted in the presence of calcium carbonate or other divalent salts, addition of 0.1–0.3 wt% nonionic surfactant may be required. Batch-to-batch variation within the 86.5–89.0 mol% hydrolysis window can shift colloidal efficiency; particle-size distribution should be checked by laser diffraction after each recipe adjustment. Published data for this specific reactor configuration is limited, and addition windows are normally established by factorial screening rather than transferred directly from supplier brochures.
In paper surface sizing, EG-05C is evaluated at dry pickup levels of 0.5–2.0 g/m² in combination with oxidised starch at a PVOH-to-starch dry-weight ratio between 1:4 and 1:10. The size press roll temperature is maintained at 50–60 °C to avoid skin-over in the return pan. Surface sizing with EG-05C improves Cobb60 water absorptiveness relative to starch-only formulations when measured according to ISO 535. The advantage over fully hydrolysed PVOH is lower viscosity build at identical solids; the trade-off is lower water resistance after drying. When wet-rub performance is required, a glyoxal-based insolubiliser is added at 0.5–1.0 wt% of PVOH. For textile warp sizing, size boxes are typically operated at 70–80 °C with 10–12 wt% solids. Desizing is performed with hot water at 85 °C. The low viscosity of EG-05C allows uniform add-on at higher machine speeds; however, low film strength may not protect high-staple polyester yarns without a co-binder or acrylic size.
| Grade | 4% aqueous viscosity at 20 °C | Degree of hydrolysis |
|---|---|---|
| EG-03 | 3.0–3.6 mPa·s | 86.5–89.0 mol% |
| EG-05C | 4.8–5.8 mPa·s | 86.5–89.0 mol% |
| EG-10 | 9.0–11.0 mPa·s | 86.5–89.0 mol% |
| EG-20 | 20.5–24.5 mPa·s | 86.5–89.0 mol% |
EG-05C occupies the low-viscosity end of the partially hydrolysed EG series. Substitution with EG-10 or EG-20 increases solution viscosity, raises shear sensitivity, and reduces migration in dried films. Lower-viscosity EG-03 provides faster wetting but lower film tensile strength. Selection between EG-05C and higher-viscosity grades is therefore driven by the required solution viscosity at a given solids content and by migration limits in the final article. For blown water-soluble film, EG-05C is generally not preferred because low melt strength can produce bubble instability. Higher-viscosity grades such as EG-20 or EG-30 are selected for melt extrusion processes. EG-05C is better suited to cast film, adhesives, paper treatment, and polymerisation stabilisation where low solution viscosity is an operational requirement.
In remoistenable adhesives, the 11.0–13.5 mol% residual acetate in EG-05C reduces PVOH crystallinity and increases water sensitivity compared with fully hydrolysed grades. This lowers the dry activation temperature and accelerates tack development, but it also reduces blocking resistance under humid conditions. A typical laboratory protocol is to draw down a 25–50 µm wet film on a polyester substrate, dry at 80 °C for 3 min, and then measure open time at 23 °C and 50 % RH. Remoistening is performed with water spray at 2–4 g/m², and tack development is recorded with a probe tack tester. Films based on EG-05C typically develop tack within 5–15 s under these conditions; published data for this exact formulation is limited. Substitution of fully hydrolysed PVOH increases remoistening time and may require 5–10 wt% plasticiser, such as glycerol, to maintain film flexibility.
Formulations containing EG-05C should avoid borate ions because borate crosslinks the 1,2-diol units of PVOH and produces a gel that can block filter screens and transfer lines. The same effect is exploited in some adhesive formulations but requires in-line dilution and pH control with sodium bicarbonate to maintain pH 7.0–8.5. Strong mineral acids and bases catalyse hydrolysis of residual acetate groups during prolonged storage at elevated temperature; solution pH is therefore maintained between 5.0 and 7.0 when no reactive additive is present. For indirect food-contact evaluations, the relevant 21 CFR citations that may apply to the formulated article include 175.105, 176.170, and 176.180; end-use compliance requires a specific regulatory review by the formulator. Under European Union use, the product is subject to REACH, and the registration number assigned to the manufacturer’s legal entity should be obtained from the safety data sheet rather than derived from the grade name.
