| HS Code | 263979 |
| Appearance | White granular powder |
| Chemical Name | Polyvinyl alcohol (partially saponified) |
| Degree Of Saponification Mol Percent | 86.5 - 89.5 |
| Viscosity 4 Percent Solution At 20 C Mpa S | 4.6 - 5.8 |
| Ph 4 Percent Solution | 5.0 - 7.0 |
| Average Degree Of Polymerization | Approximately 500 |
| Volatile Content Weight Percent | <= 5.0 |
| Ash Content Weight Percent | <= 0.3 |
| Specific Gravity | 1.27 |
| Solubility | Soluble in hot water; insoluble in common organic solvents |
As an accredited GOHSENOL GL-05 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | GOHSENOL GL-05 polyvinyl alcohol is packaged in 25 kg multi-wall paper bags with a polyethylene liner, ensuring safe handling and storage. |
| Container Loading (20′ FCL) | GOHSENOL GL-05 is loaded into a 20′ FCL, securely palletized, labeled, and ventilated to ensure safe transport. |
| Shipping | GOHSENOL GL-05 is a water-soluble polyvinyl alcohol resin powder. It is generally classified as non-hazardous for transport, but shipments must be kept dry and protected from moisture. Packed in multi-layer paper bags with an inner liner, store away from heat and ignition sources. Standard truck, sea freight, or courier shipping applies. |
| Storage | Store GOHSENOL GL-05 in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep the container tightly sealed to prevent moisture absorption and contamination. Avoid dust accumulation; use appropriate bonding/grounding. Store away from incompatible materials such as strong oxidizers. Maintain proper labeling and access. Protect from physical damage. |
| Shelf Life | Shelf life typically 2 years when stored sealed in a cool, dry place away from moisture and direct sunlight. |
For fine paper surface sizing at production speeds above 800 m/min, GOHSENOL GL-05 is typically handled as a prepared stock solution at 15–20 wt% solids before dilution into oxidised starch size press formulations. The grade’s published 4% aqueous viscosity of 4.5–5.5 mPa·s at 20 °C and degree of hydrolysis of 86.5–89.0 mol% place it in the low-viscosity partially hydrolysed polyvinyl alcohol class, which permits extension of starch-based surface sizes without pushing final size press working viscosity above the 20–70 mPa·s range at 60 °C required by metered film press units. Typical starting points use 10–30 parts dry GOHSENOL GL-05 per 100 parts total size solids at a size press solids level of 8–12 wt%; the actual ratio is adjusted against base sheet internal sizing and surface water absorption measured according to ISO 535. On a rod-metered film press, conditioned pickup is maintained between 1.5 g/m² and 3.0 g/m² dry, because higher pickup contributes to dryer load, sheet curl, and binder migration into the base sheet. During pilot trials, blade scratching at low coat weights was observed when the size solution temperature dropped below 55 °C and the Brookfield viscosity exceeded 80 mPa·s; therefore the working tank is held at 60–65 °C. The PVOH fraction increases surface film strength and reduces peeling and lining tendency in offset printing but does not replace internal hydrophobic sizing for edge wicking control. In food-contact paper and paperboard, the finished sheet must meet FDA 21 CFR 176.170 or BfR XXXVI at the finished article level; the grade contributes to the formulation but does not singularly confer compliance. Borate-containing starch preservatives should be excluded from PVOH-containing size press formulations because crosslinking of partially hydrolysed PVOH with borate ions leads to viscosity spikes, gel specks, and filter plugging. Long-term stored PVOH stock solutions require biocidal preservation and closed tanks; surface skinning occurs in open vessels at ambient humidity below 40% RH, and pre-drying of the raw powder is recommended when warehouse storage exceeds 60% RH to avoid lumping during dissolution.
In continuous and semi-batch vinyl acetate–ethylene emulsion polymerisation, protective colloid selection determines particle size distribution, emulsion viscosity under shear, and wet tack development in formulated wood adhesives. GOHSENOL GL-05 is introduced as a 10 wt% aqueous solution, typically at 2.0–5.0 wt% based on total monomer, into a jacketed reactor equipped with a pitched-blade turbine running at 80–120 rpm; the partially hydrolysed architecture with a degree of hydrolysis of 86.5–89.0 mol% provides interfacial activity at the vinyl acetate–water interface while retaining sufficient hydroxyl functionality for grafting and colloidal stabilisation. Emulsion polymerisation is carried out at 55–75 °C with redox initiator systems, and reactor pH is controlled between 4.0 and 5.5 to avoid excessive ester hydrolysis. The resulting emulsions generally show Brookfield viscosity between 1 000 mPa·s and 6 000 mPa·s at 25 °C measured according to ISO 2555, with final solids of 52–56 wt% determined by ISO 3251. In adhesive performance screening, PVOH-protected vinyl acetate–ethylene dispersions formulated with 0.3–1.0 wt% plasticiser and 5–15 wt% calcium carbonate filler are tested for tensile shear strength according to EN 204/205; durability classification D2 or D3 depends on formulation and substrate conditioning. Fully hydrolysed grades are not selected in this segment because their lower surface activity and higher solution viscosity narrow the operating window for monomer dispersion and increase the risk of gel string formation. The low-viscosity GL-05 grade allows higher solids in the pre-dissolved colloid feed without exceeding the static mixer pressure drop observed in 10 wt% fully hydrolysed feeds. A processing limitation occurs when the PVOH charge exceeds 6 wt% on total monomer, as final emulsion viscosity can exceed 10 000 mPa·s, causing heat transfer loss and high-pressure filtration. Borate-based buffering agents must not be used because partially hydrolysed PVOH forms reversible diol–borate complexes that produce high gel strength at room temperature. Published kinetic data for this specific grade in ethylene-rich vinyl acetate–ethylene systems are limited; reactor optimisation typically proceeds by pilot-scale semi-batch monomer addition rather than extrapolation from vinyl acetate homopolymer recipes.
The low-viscosity profile of GOHSENOL GL-05 is applied in remoistenable adhesive coatings for labels, envelopes, and paper tape where the dry film must be non-blocking under ambient storage and tacky only after rewetting. In roll-coating and slot-die lines, the adhesive is prepared at 30–45 wt% solids with GOHSENOL GL-05 as the major film former at 70–85 wt% of the dry binder, with the balance made up of dextrin or sucrose plasticiser. Final application viscosity is held between 800 mPa·s and 2 500 mPa·s at 25 °C using a Brookfield LV spindle at 30 rpm; the grade’s low molecular weight makes it possible to reach this window without exceeding 65 °C during mixing, reducing loss of re-moistening activity caused by thermal degradation of the plasticiser. Dry coat weight is normally 12–20 g/m², verified by inline beta gauge and by destructive gravimetric testing. Blocking resistance is evaluated at 40 °C and 60% RH under a 7 kPa load for 24 h, while reactivation tack is assessed by open-time wetting on kraft linerboard. FDA-regulated uses for food-contact labels require the finished adhesive to comply with FDA 21 CFR 175.105; the formulator should not assume that PVOH alone provides full regulatory coverage because residual monomers, plasticiser, defoamer, and substrate transfer all contribute to the overall migration profile. Borax or boric acid additions are deliberately avoided in storage-stable formulations because borate crosslinking raises viscosity, reduces remoistenability, and can produce speck formation during slot-die coating. Published data on specific GOHSENOL GL-05/dextrin plasticiser equilibria are limited; industrial qualification typically includes a 3-month accelerated ageing protocol at 35 °C and 70% RH to separate true re-moistening performance from hygroscopic blocking under pallet compression.
Polyester filament warp sizing with PVOH is used when weaving high-density fabrics on air-jet looms, where size film adhesion to the hydrophobic filament and low shedding behaviour are more critical than in spun cotton processing. In a two-box slasher, GOHSENOL GL-05 is formulated at 6–10 wt% solids with 30–50 wt% of the dry size replaced by the PVOH grade and the balance maintained with modified starch or acrylic co-binder. Size box temperature is held at 80–85 °C, squeeze roll pressure is set to give size add-on between 4% and 8% dry weight on warp, and drying can temperature is controlled at 110–130 °C with final yarn moisture below 1.5%. The low-viscosity character reduces size penetration into the filament bundle, which is desirable for film-forming surface protection but requires lower static squeeze pressures to avoid starved filaments and uneven add-on across the sheet. Warp breakage during weaving is monitored against the unsized control according to mill-specific loom stop data; tensile properties of sized yarn are evaluated by ISO 2062. The partially hydrolysed grade gives easier desizing in hot water at 85–90 °C compared with fully hydrolysed PVOH films, reducing desizing time in alkaline scour. A processing boundary is encountered when the size box recirculation system operates above 85 °C for more than 8 h, as molecular weight degradation and resultant film strength loss occur; therefore batch holding times and pump shear must be controlled. Borate-containing desizing assistants should not be used before size film removal because residual borate can precipitate PVOH complexes on dryer cans and cause subsequent fabric staining. Published data for this specific grade in high-speed air-jet weaving under high warp tension are limited; mill qualification uses small-lot slashing trials with loom stop data rather than laboratory film tensile testing alone.
Ceramic tile dry-press feedstock is spray-dried with 0.4–1.2 wt% GOHSENOL GL-05 based on dry body solids, alongside 0.2–0.5 wt% of a polycarboxylate dispersant, to improve green compact tensile strength and edge integrity after hydraulic pressing at 35–45 MPa. The grade is pre-dissolved at 15 wt% in water at 85–90 °C and metered into the slurry before spray drying with inlet air at 180–220 °C and outlet air at 90–110 °C. Spray-dried granules with residual moisture 5–7 wt% are compacted; green strength is measured by a three-point bending method adapted from ISO 10545-4 on unfired specimens. The organic binder burns out between 350 °C and 500 °C during fast firing; residues must remain below the detection limit of ash testing to avoid black core and surface pinholes. The low-viscosity grade provides adequate binder distribution in the slurry without increasing slurry viscosity above 600 mPa·s at 20 °C. A significant processing limitation is that the exact burnout onset depends on kiln atmosphere, body composition, and heating rate; published data for this specific GOHSENOL GL-05–ceramic body configuration are limited, so kiln trials are required to set the thermal profile. Binder migration to the granule surface during drying is controlled by adjusting slurry solids and inlet air temperature; high inlet temperatures above 220 °C can cause surface skinning, lower green density, and reduce compact strength after pressing.
GOHSENOL GL-05 is used as the hydrophilic binder in microporous inkjet receiving layers where fumed or precipitated silica forms the primary pigment. The coating colour is prepared by dispersing 100 parts silica in an aqueous bicarbonate-adjusted medium at 20–25 wt% solids, then adding 25–45 parts dry GOHSENOL GL-05 per 100 parts silica. Final coating solids are held at 18–24 wt% and Brookfield viscosity at 50–200 mPa·s at 25 °C, allowing slot-die or air-knife coating at 8–15 g/m² dry. The partially hydrolysed grade is selected because its low solution viscosity permits binder addition without exceeding shear stability limits in high-speed pigment dispersers; excessive binder above 45 parts per 100 parts silica reduces microporosity and slows ink absorption, while binder below 20 parts creates dusting and cracking after drying. Coated paper is conditioned at 23 °C and 50% RH before testing by ISO 5627 for smoothness, ISO 2470 for brightness, and an internal transfer method for liquid absorption because a single global ink absorption standard is not uniformly specified across printable media. Lightfastness and image bleed are evaluated after printing with dye-based aqueous inks. A process constraint is the interaction of PVOH with multivalent cations in hard water; polyvalent ions can reduce binder solubility by salting-out and produce coating line gel specks. Borate-treated tap water is not used for dispersion because it causes an immediate viscosity increase. Published data comparing GOHSENOL GL-05 with other partially hydrolysed grades in silica microporous layers are limited; coating formulation optimisation uses pilot-scale drawdowns and ink absorption scans rather than single-point viscosity readings.
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GOHSENOL GL-05 is a partially saponified polyvinyl alcohol resin supplied by Mitsubishi Chemical Corporation as white to pale-yellow granules. The grade is defined by a 4 wt% aqueous solution viscosity of 4.8–5.8 mPa·s at 20 °C and a degree of hydrolysis of 86.5–89.0 mol%, both determined according to JIS K6726. The corresponding residual acetyl content is approximately 11.0–13.5 mol%. This residual acetate content disrupts interchain hydrogen bonding more than fully saponified grades, reducing crystallinity and allowing cold-water solubility. Compounding-grade limits commonly include volatile matter at or below 5.0 wt%, ash content at or below 0.5 wt% as Na₂O, and a 4% aqueous solution pH of 5.0–7.0. Because the 4% solution viscosity is relatively low, GL-05 occupies the middle position between GOHSENOL GL-03 and GL-08 within the partially hydrolysed product series. The main application areas include vinyl acetate emulsion polymerization, paper surface sizing, textile warp sizing, water-soluble films, and remoistenable adhesives. The selection of GL-05 over other GOHSENOL grades depends on the balance between cold-water solubility, dried-film tensile strength, and solution handling viscosity.
| Property | Value | Test Basis |
|---|---|---|
| Viscosity of 4 wt% aqueous solution at 20 °C | 4.8–5.8 mPa·s | JIS K6726 |
| Degree of hydrolysis | 86.5–89.0 mol% | JIS K6726 |
| Volatile matter | ≤5.0 wt% | JIS K6726 |
| Ash as Na₂O | ≤0.5 wt% | JIS K6726 |
| pH of 4% aqueous solution | 5.0–7.0 | JIS K6726 |
Aqueous solution preparation of GL-05 at ambient temperature is feasible because the 86.5–89.0 mol% hydrolysis level suppresses the crystallinity that forces fully saponified polyvinyl alcohol into solution only above 80–85 °C. Dry GL-05 added directly to a stirred tank at 20 °C can still form gelatinous surface lumps. Production-scale mixing therefore uses a Cowles-type high-shear disperser with a tip speed of 15–20 m/s to suspend the granules at 18–22 °C, followed by heating to 75–85 °C for 30–60 min and cooling under moderate agitation at 50–80 rpm. The low molecular weight of GL-05 permits high-solids solutions up to 15–20 wt% before viscosity limits transfer by gear pump, but foam generation increases with agitation above 80 rpm during cooling. Borate-containing additives should be avoided or introduced only after dilution because borate ions crosslink the pendant diol units of polyvinyl alcohol and raise solution viscosity sharply. Preservative selection for stored aqueous solutions commonly includes isothiazolinone compounds at 50–150 ppm; the pH should be maintained above 4.5 to avoid slow deacetylation and below 9.0 to avoid excessive hydrolysis.
In vinyl acetate and vinyl acetate-ethylene emulsion polymerization, GOHSENOL GL-05 functions as a protective colloid rather than as a conventional surfactant. The 86.5–89.0 mol% degree of hydrolysis provides aqueous solubility, while the residual acetate segments contribute hydrophobic anchoring at monomer-water interfaces. Typical addition rates in batch reactors are 2–6 parts per hundred monomer by weight; the charge is prepared as a 4–10 wt% solution and added before initiation at 65–75 °C with potassium persulfate or a redox initiator. The short chain length of GL-05 stabilizes latex without producing the high viscosity associated with fully hydrolysed polyvinyl alcohol at equal solids. In 1000 L glass-lined reactors, substitution of a fully hydrolysed grade by GL-05 at equal active content can reduce latex viscosity and improve freeze-thaw stability, while increasing dried-film water sensitivity. Increased coagulum has been observed when the GL-05 solution is charged at pH below 4.5 or when transition-metal contamination exceeds 5 ppm; demineralized water and 0.01–0.05 wt% EDTA are therefore used as process controls. Laser diffraction measurement according to ISO 13320 can be used to track particle size; published data for this specific production equipment configuration is limited, but PVA-stabilized vinyl acetate latices frequently show D50 values in the 0.5–2.0 µm range.
Paper surface sizing and remoistenable adhesive formulations exploit the cold-water solubility of GL-05. In starch-based size press formulations, addition of 2–4 wt% GL-05 is used to improve surface strength and reduce liquid penetration. Mill-specific comparison using ISO 535 Cobb60 water absorption is required because the reduction depends on base sheet permeability, size press configuration, and drying intensity. Films cast from 10% aqueous GL-05 solution and dried at 60 °C show lower tensile strength than fully hydrolysed films of equivalent viscosity, but the films rewet more rapidly because residual acetate groups reduce crystallinity. Tensile properties of supported or free films may be determined by ISO 527-3:2018 or ASTM D882. Remoistenable adhesive formulations commonly use 10–25 wt% GL-05 in water with 5–15 phr of glycerol or sorbitol on PVA solids. The low molecular weight reduces cold-viscosity and increases rewetting speed, but the resulting adhesive film has lower water resistance than fully hydrolysed PVA or crosslinked vinyl acetate emulsion adhesives. The grade is therefore selected where fast water activation is more important than maximum bond strength under wet conditions.
Thermal processing of GOHSENOL GL-05 below its decomposition onset requires internal plasticization and narrow barrel-temperature control. Thermogravimetric analysis under nitrogen indicates decomposition onset near 200 °C. Extrusion of PVA compounds therefore typically uses 10–30 phr of glycerol, sorbitol, or water as internal plasticizer in corotating twin-screw extruders with L/D ratios of 40:1 to 52:1. Barrel temperatures are commonly set between 90 °C and 190 °C, with the highest zones at the die. The low molecular weight of GL-05 reduces melt viscosity but also reduces blown-film bubble stability compared with higher-viscosity grades such as GL-08. Die-lip deposits can develop when processing temperatures exceed 200 °C or when residence time exceeds 180 s; this is consistent with thermal elimination of acetic acid and the formation of conjugated double bonds. Pre-drying at 80 °C for 4 h is recommended when moisture content exceeds 5 wt% or when the product has been stored at relative humidity above 60%, because excess water causes bubble irregularity and surface defects. Plasticizer migration kinetics in the finished film are faster for GL-05 than for higher molecular weight partially hydrolysed grades, which should be considered when specifying film-to-film blocking behavior.
Partially hydrolysed PVA grades differ from fully hydrolysed grades primarily in dissolution temperature, crystallinity, moisture uptake, and dried-film water resistance. Fully hydrolysed PVA in the same viscosity range requires solution temperatures of 80–90 °C, whereas GL-05 dissolves at ambient temperature with proper dispersion. The residual acetate content of GL-05 reduces dried-film tensile strength but improves flexibility and rewetting. Within the partially hydrolysed GOHSENOL GL series, the main variable is chain length. GL-03 has a specified 4% solution viscosity of 3.0–3.8 mPa·s, providing lower cohesive strength but easier high-solids handling. GL-08 has a typical viscosity of 7.5–9.5 mPa·s, providing higher dried-film tensile and adhesive strength but increased mixing load. GL-05 at 4.8–5.8 mPa·s is therefore specified when the application requires film strength above GL-03 but solution viscosity below GL-08.
| Grade | Viscosity of 4% solution at 20 °C | Degree of hydrolysis | Practical Consequence |
|---|---|---|---|
| GL-03 | 3.0–3.8 mPa·s | 86.5–89.0 mol% | Lowest cohesive strength; lowest solution viscosity |
| GL-05 | 4.8–5.8 mPa·s | 86.5–89.0 mol% | Balance of film strength and manageable solution viscosity |
| GL-08 | 7.5–9.5 mPa·s | 86.5–89.0 mol% | Higher tensile and adhesive strength; higher mixing load |
Before specifying GL-05 for food-contact or long-term storage, the current safety data sheet and lot-specific certificate of analysis should be reviewed. In the United States, polyvinyl alcohol may be referenced as an indirect additive in components of paper and paperboard under FDA 21 CFR 176.170; the end-use limitations are substance-specific and must be confirmed against the current revision. In the European Union, the finished article must comply with the relevant requirements of Regulation (EC) No 10/2011 and national food-contact legislation. Japanese applications require confirmation under the Food Sanitation Law. Storage in sealed bags at or below 40 °C and 60% relative humidity is recommended to prevent caking and moisture uptake above 5 wt%. The manufacturer may assign a shelf life of 12 months from the production date for unopened packaging; material older than this should be qualified by JIS K6726 viscosity, pH, and volatile matter testing before use.
