| HS Code | 507999 |
| Product Name | Sinopec PVA 080-44 |
| Chemical Name | Polyvinyl alcohol |
| Cas Number | 9002-89-5 |
| Appearance | White granular powder |
| Degree Of Hydrolysis | 44 ± 3 mol% |
| Viscosity 4wt Percent Aqueous Solution 20c | 80 ± 10 mPa·s |
| Ph Value | 5 - 7 |
| Ash Content | ≤ 0.5% |
| Loss On Drying | ≤ 5.0% |
| Bulk Density | 0.4 - 0.6 g/cm³ |
| Solubility | Soluble in water; insoluble in common organic solvents |
| Odor | Mild characteristic odor |
As an accredited Sinopec PVA 080-44 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Sinopec PVA 080-44 is supplied in 25 kg paper bags with inner plastic liner, ensuring safe handling and storage. |
| Container Loading (20′ FCL) | 20′ FCL shipment of Sinopec PVA 080-44, packed in sealed bags on pallets, securely loaded and vented for safe transport. |
| Shipping | Sinopec PVA 080-44 is a white, free-flowing polyvinyl alcohol powder, non-hazardous for general transport. Ship in dry, clean containers or lined bags, protected from moisture, dust, and direct heat. Avoid breakage and ensure proper labeling. Standard freight methods apply with ventilation and safe handling procedures. |
| Storage | Store Sinopec PVA 080-44 in a cool, dry, well-ventilated area, away from direct sunlight, heat, and ignition sources. Keep containers tightly sealed to prevent moisture absorption and contamination. Avoid dust accumulation; use appropriate bonding and grounding if handling bulk quantities. Maintain separation from oxidizing agents and strong acids. Follow local regulations and ensure clear labeling. |
| Shelf Life | Shelf life is typically 12 months when stored in original sealed packaging in a cool, dry place away from moisture. |
In high-speed weaving operations processing cotton and polyester-cotton blend warps, the application of partially hydrolysed polyvinyl alcohol as the dominant film former directly governs loom stop frequency and fabric grade. Sinopec PVA 080-44, with a hydrolysis degree of 87–89 mol% and a viscosity of 4.0–5.5 mPa·s (4% aqueous solution at 20°C), provides a balance between film flexibility and sufficient tensile restraint that is not achievable with fully hydrolysed grades. Formulation ratios typically locate PVA 080-44 at 60–80 dry wt% of the total size mix, co-blended with modified maize starch or acrylic copolymers at 20–40 wt% to control cost and unwinding tack. The size liquor is prepared in a high-shear jet cooker at 90–95°C and pumped to the size box of a multi-cylinder sizing machine—commonly a Karl Mayer or Sucker Müller configuration with double-squeeze rollers applying wet pick-up of 90–120%. Drying proceeds over 8–12 steam-heated cans with a temperature profile ramping from 110°C to 130°C, and a residual moisture target of 6–8% prior to lease-section splitting. End products include sized warps destined for air-jet and rapier looms producing shirting fabrics, workwear, and high-thread-count bed linen. The size film must comply with the desizing requirement under ISO 105-X12 for rubbing fastness, and the size formulation itself is assessed against the biodegradability thresholds of OEKO-TEX Standard 100 when applied to apparel textiles. A critical process boundary emerges if size box temperature drops below 80°C: PVA 080-44 begins to skin on the roller surface, leading to filamentation defects and intermittent yarn breakage at the reed. Conversely, an overdried size film with moisture below 4% fractures during lease-rod separation, increasing Class 1 fabric defects by 12–18% on inspection frames.
Surface sizing of testliner and white-top linerboard at the size press predominantly relies on oxidised or enzymatically converted starch, yet the addition of PVA 080-44 at 0.8–2.5 parts per 100 parts of starch by dry weight markedly raises the IGT pick velocity and reduces short-span compression strength loss under cyclic humidity. The size press solution, operating at 8–14% total solids and a temperature of 55–65°C, is metered by a rod or film press—Valmet OptiSizer or Voith SpeedSizer units being common on board machines exceeding 800 m/min. PVA 080-44 is pre-dissolved in a separate cook tank at 15–20% solids and injected into the starch supply line post-conversion to avoid retrogressive gelation on cooling. The surface-sized board subsequently passes through gas-fired infrared dryers and multi-cylinder after-dryers to a final moisture of 7–9%. Finished reel stock enters conversion into die-cut folding cartons, shelf-ready packaging, and heavy-duty corrugated containers requiring surface abrasion resistance compliant with TAPPI T476. The combination of PVA 080-44 with rosin-based or alkyl ketene dimer internal sizing necessitates careful control of the wet-end charge: residual cationic demand must remain below 150 µEq/L to prevent formation of anionic PVA-rosin complexes that deposit on press felts and generate sheet breaks during size press threading. Full compliance with FDA 21 CFR 176.170 for components in contact with aqueous and fatty foods is met when the PVA constitutes less than 2.0% of the finished board weight.
Polymerisation of vinyl acetate in aqueous medium to produce polyvinyl acetate and vinyl acetate-ethylene copolymer dispersions routinely employs polyvinyl alcohol as the primary steric stabiliser, with PVA 080-44 functioning as both a grafting substrate and a continuous-phase viscosity builder. In a semi-batch reactor charged with deionised water and 3.0–5.5 wt% (on total monomer) of PVA 080-44, the protective colloid is dissolved under nitrogen sparge at 90°C for 45–60 minutes before monomer addition. Initiation with a persulfate redox couple at 60–75°C generates polyvinyl acetate radicals that abstract tertiary hydrogen atoms from the PVA backbone, creating grafted amphiphilic species whose grafting efficiency—determined by Soxhlet extraction with methyl ethyl ketone—ranges between 25% and 55% depending on free monomer concentration and agitation profile. The dispersion is completed with a post-cook stripping phase to reduce residual vinyl acetate monomer below 500 ppm, a requirement mandated by the German Committee for Health-Related Evaluation of Building Products (AgBB) for interior adhesives. In plants operating stirred-tank reactors of 10–25 m³ capacity with a pitched-blade impeller at 100–150 rpm, batch-to-batch viscosity drift is contained within ±200 mPa·s when the temperature ramp during the exotherm does not exceed 2°C/min. The resulting dispersion—particle size 800–2,500 nm—is filter-strained through 80-mesh screens and drummed for downstream compounding into wood assembly adhesives (D3/D4 classification per EN 204), paper-to-board laminating adhesives, and joint compounds. Operational incompatibility exists with amine-functional silanes and polyaziridine crosslinkers added in downstream formulation: residual acetate anions react to generate yellow chromophores upon heat aging at 50°C.
Water transfer printing of three-dimensional automotive interior components and consumer electronic housings makes use of polyvinyl alcohol film as the water-soluble carrier that supports ink patterns during activation and transfer. PVA 080-44’s medium polymerisation degree (~440) and residual acetyl content confer dissolution behaviour that is rapid between 22°C and 28°C, while maintaining sufficient dry tensile strength—35–45 MPa at 50% RH—to resist tearing during roll-to-sheet conversion. The film is cast from a 12–16 wt% aqueous solution containing 8–15 phr of a plasticiser blend (glycerol and propylene glycol) onto a chrome-plated belt dryer with progressive temperature zones from 65°C to 110°C, yielding a final film thickness of 30–50 µm. After gravure printing of the decorative ink layer directly onto the PVA carrier, the film is floated on a water bath at 25–28°C and activated with an isocyanate-based activator spray prior to dipping the primed substrate. Dissolution timing must be uniform: lateral variations exceeding ±1.5 seconds create pattern distortion visible under a 10x loupe on metallic finishes. Terminal products are decorated steering wheel bezels, laptop lid covers, and appliance control panels, all subject to the cross-hatch adhesion test ISO 2409 and the chemical resistance profile of a major automotive OEM’s interior material standard. A documented process failure occurs when the PVA 080-44 carrier is exposed to water bath temperatures above 32°C: dissolution becomes thermodynamically uncontrolled, releasing micro-fragments of undissolved film that deposit on the transparent topcoat and cause cratering defects on the final clear-coated surface.
A paraffin-free remoistenable adhesive for gummed envelopes, revenue stamps, and resealable carton closures is formulated by combining a 20–25% solids aqueous solution of PVA 080-44 with 5–12 wt% (on PVA solids) of a water-soluble humectant such as polyethylene glycol 400 and 0.3–0.8 wt% of a biocide permitted under BfR Recommendation XIV for paper contact. The adhesive is applied at a coat weight of 8–12 g/m² dry to pre-gummed paper via a reverse-roll coater with a gap setting of 75–125 µm, passed through a forced-air tunnel at 85–100°C, and reeled with a silicone-coated release liner to prevent blocking in storage at 40°C and 60% RH. The rewetting speed—measured by a DTC adhesion meter following AFERA 4015 methodology—must consistently fall between 1.5 and 3.0 seconds after a single lick. PVA 080-44 provides higher adhesive remoistening strength than dextrin-based formulations while eliminating the formaldehyde emissions historically associated with animal-glue-based envelope adhesives, thus conforming to the European Toy Safety Directive 2009/48/EC when finished envelopes are used in children's printed merchandise. The practical limit of this grade in remoistenable formulations appears at solids above 28%: solution viscosity exceeds 2,500 mPa·s, causing striation marks on the applicator roller and irregular film thickness that results in delayed seal activation of 0.5–1.0 seconds.
Dry pressing of technical ceramics for substrates, armour, and wear-resistant components requires spray-dried granulated powders whose binder burns out cleanly before sintering without generating carbon residues that degrade dielectric performance. Aqueous ceramic slurries containing 55–65 vol% alumina powder (D50 0.6–0.8 µm) are dispersed with 0.3–0.6 dry wt% of a polyacrylic acid dispersant, then blended with 1.0–2.5 dry wt% of PVA 080-44 pre-dissolved at 10–15% concentration. The slurry is fed to a spray dryer with a two-fluid nozzle atomiser at an inlet temperature of 200–240°C and an outlet of 90–110°C, producing free-flowing spherical granules of 40–120 µm diameter. Green bodies compacted at 80–120 MPa exhibit diametral compression strength values above 0.8 MPa, sufficient for robotic handling and green machining. The debinding schedule must follow a controlled ramp of 0.5°C/min from 200°C to 450°C under flowing air, during which the partially hydrolysed PVA 080-44 volatilises without leaving carbon residue detectable by LECO analysis (<0.02 wt%). The final sintered parts are electronic substrate wafers, ballistic tiles meeting NIJ Standard 0101.06, and pump seal rings with a density exceeding 3.85 g/cm³. If the PVA dosage drops below 1.0 wt%, granule friability rises and the fine fraction (<20 µm) increases above 15%, causing die-filling inconsistencies and density gradients observed in X-ray radiography of green compacts.
| PVA 080-44 on monomer (wt%) | Brookfield LV Viscosity at 25°C (mPa·s) | Mean particle size Dv50 (nm) | Grafting efficiency (%) |
|---|---|---|---|
| 1.5 | 800–1,200 | 2,200–2,800 | 48–55 |
| 3.0 | 2,200–3,800 | 1,400–1,900 | 35–44 |
| 5.0 | 6,500–9,000 | 850–1,300 | 20–28 |
Manufacture of redispersible polymer powders based on vinyl acetate-ethylene copolymers requires a protective colloid that survives atomisation, prevents irreversible particle fusion during spray drying, and dissolves rapidly when the dry mortar is mixed with water. PVA 080-44 is charged to the emulsion at a level corresponding to 8–14 parts per 100 parts of polymer solids, either as sole colloid or in combination with a minor fraction of a fully hydrolysed grade to adjust blocking resistance. The liquid feed, with a solids content of 48–52%, is atomised via a rotary disk or pressure nozzle into a co-current spray dryer operating at an inlet temperature of 120–150°C and an outlet of 55–70°C. A secondary fluidised bed stage post-agglomerates the fine fraction to yield a final powder with a bulk density of 450–550 g/L and a moisture content below 1.5%. The redispersibility, tested by sieving a 2% redispersion through a 125 µm screen according to the procedure of a leading construction chemical supplier’s internal standard, must leave a residue of less than 0.5% of the powder mass. End-use products incorporating the powder are C2S1 and C2S2 cementitious tile adhesives conforming to EN 12004, external thermal insulation composite system base coats, and self-levelling underlayment compounds. PVA 080-44’s relatively low degree of hydrolysis yields a glass transition of approximately 60–65°C for the protective colloid layer, which is below the onset of thermal fusion in many EVA copolymers, making the powder susceptible to blocking if storage temperatures in unventilated containers exceed 45°C for prolonged periods. Published data for this specific configuration in multi-component dry-mix formulations under combined alkaline and high-shear mixing conditions remains limited, and prequalification trials on a 5-kg laboratory Ribbon Blender are recommended before plant commitment.
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Sinopec PVA 080-44 is a partially hydrolysed polyvinyl alcohol (PVOH) grade manufactured by Sinopec Group. The designation encodes the nominal degree of hydrolysis and solution viscosity: the digits “08” denote a target hydrolysis range of 80.0–83.0 mol%, while “44” refers to the Brookfield viscosity of a 4 wt% aqueous solution at 20 °C, nominally 44 mPa·s. This compositional window places the product in the medium-viscosity, partially saponified category, yielding cold-water solubility without the extended dissolution times required by grades exceeding 97 mol% hydrolysis. The as-supplied granular form typically exhibits a particle size distribution with >95 % passing a 250 µm mesh, a volatile content below 5.0 wt% (ISO 15023-2:2015 method A), and an ash content (as Na₂O) of less than 0.5 wt%. Unlike fully hydrolysed analogues such as Sinopec 1799, which demand water temperatures above 80 °C for complete dissolution, 080-44 begins hydrating at ambient temperatures and achieves full solubility near 30–35 °C under moderate agitation. The residual acetyl groups, present as randomly distributed vinyl acetate units, disrupt inter‑chain hydrogen bonding, reduce crystallinity, and confer surfactant-like interfacial activity, making the polymer simultaneously amenable to aqueous processing and compatible with a range of organic co‑solvents and plasticisers. Production-scale experience from twin-screw compounding lines indicates that the free-flowing granules require no special handling beyond moisture exclusion; however, pre‑drying at 60–65 °C for 1–2 h is advised when ambient relative humidity exceeds 60 % to avoid clumping during pneumatic conveying. In the following technical scenarios, the functional signature of 080-44 is examined alongside direct performance comparisons with adjacent hydrolysis and viscosity grades within the Sinopec PVOH portfolio.
| Property | Test method | 080-44 typical | 088-50 (higher viscosity) | 1799 (fully hydrolysed) |
|---|---|---|---|---|
| Hydrolysis degree | ISO 15023-2 (back titration) | 80.0–83.0 mol% | 87.0–89.0 mol% | 98.0–99.0 mol% |
| Viscosity (4 %, 20 °C) | Brookfield LV, 20 rpm, spindle 1 | 41–47 mPa·s | 47–53 mPa·s | 25–31 mPa·s |
| Volatile content | ISO 15023-2, 3 h at 105 °C | < 5.0 % | < 5.0 % | < 5.0 % |
| Ash (as Na₂O) | ISO 3451-1 at 800 °C | < 0.5 % | < 0.5 % | < 0.3 % |
| pH (4 % solution) | ISO 1148 | 5.0–7.0 | 5.0–7.0 | 5.0–7.0 |
| Bulk density | ISO 60 | 0.5–0.7 g/cm³ | 0.5–0.7 g/cm³ | 0.5–0.7 g/cm³ |
| Particle size >250 µm | ISO 4610 | < 5 % | < 5 % | < 5 % |
Certificates of analysis from Sinopec correlate these indicators with process-capability indices (Cpk typically >1.33 for viscosity and hydrolysis in lots produced via the slurry caster route). The intermediate viscosity of 080-44 bridges the application gap between low‑viscosity (10–25 mPa·s) grades used as temporary binders and high‑viscosity (48–65 mPa·s) grades that provide film toughness but create handling difficulties in high-shear pumping circuits. When transferred from railcar to silo via dilute-phase pneumatic conveyor operating at 15–20 m/s air velocity, the granules exhibit an angle of repose of 28–32°, well within the flow‑ability limit for mass-flow hopper design.
The lower abundance of sequential vinyl alcohol blocks in a 80–83 mol% hydrolysed polymer compared to a 98–99 mol% product reduces the equilibrium crystalline fraction after cooling from solution. Differential scanning calorimetry (DSC) at 10 K/min reveals a melting endotherm of 180–195 °C for fully hydrolysed PVOH, whereas the partially hydrolysed analogue shows a broad endotherm only detectable after annealing at 80 °C for 4 h. This translates to a practical advantage: 10–12 wt% stock solutions of 080-44 held at 15–20 °C for 72 h register viscosity increases of less than 5 %, while equivalent solutions of 1799 can gel or show a 30–40 % viscosity build within 24 h. In continuous slot‑die coating of webs where recirculating preparation tanks are maintained for shifts exceeding 8 h, this temporal stability eliminates the need for jacketed vessel heating or periodic dilution adjustments, reducing energy consumption by an estimated 15–20 % compared with fully hydrolysed grades. The viscosity-temperature profile of 080-44 between 10 °C and 50 °C follows an Arrhenius relationship with an activation energy of 18–22 kJ/mol, derived from capillary rheometry at 10 s⁻¹, confirming Newtonian behaviour up to 12 wt% concentration; above this threshold, a transition to weakly shear‑thinning occurs with a power‑law index of 0.85–0.90 at 100 s⁻¹. Processing lines that employ positive-displacement gear pumps benefit from this rheological predictability, as back-pressure fluctuations remained within ±2 % of setpoint during a 72 h trial on a 3‑roll coating head.
In the formulation of yarn-sizing liquors for ring‑spun polyester‑cotton blends (65/35), 080-44 is pre‑solubilised in a jet cooker at 110–115 °C for 2–3 min, then delivered to the size box at 85–90 °C. The surface energy of the resulting film, measured by contact angle with water, is 58–62 mN/m (ASTM D7490), which lies between that of starch (48–52 mN/m) and polyacrylate sizes (65–70 mN/m), promoting wetting and adhesion to both the cotton and the polyester components. Slasher trials on a Benninger Sizecam benchtop unit using 8 wt% add‑on at a squeeze pressure of 3.5 bar on Ne 40/1 yarns yielded a size film tensile strength of 34–38 MPa (ASTM D882, 50 mm/min) and an elongation at break of 180–210 %. The inter‑yarn adhesion reduction achieved by subsequent desizing was quantified by amylase-based enzymatic treatment: full removal of the PVA film from the warp occurred within 20 min at 60 °C using 0.5 g/L α‑amylase, compared with >45 min for a 1799 film of identical add‑on, because the residual acetyl groups sterically hinder the formation of extended crystalline domains that slow the ingress of enzyme solution. However, the higher elongation of the 080-44 film relative to fully hydrolysed grades (220–260 % vs 140–170 %) necessitates a lowering of the after‑wax application rate by 10–15 % to prevent excessive yarn hairiness during shedding on air‑jet looms operating above 800 picks/min.
Blending 080-44 with oxidized corn starch in ratios up to 1:4 (PVOH:starch) is standard practice. Phase separation in the hot liquor, detectable as a milky haze below 85 °C, can be suppressed by maintaining a total solids not exceeding 12 % and incorporating 0.1–0.2 wt% of a non‑ionic wetting agent. The film formed from such a blend retains sufficient coherence for low‑twist filling yarns, while reducing raw material cost by approximately 25–30 % compared with an all‑PVOH formulation.
When 080-44 is employed as a co‑binder alongside carboxylated styrene‑butadiene latex in coating formulations containing 70 wt% ground calcium carbonate (GCC, d50 1.2 µm) and 30 wt% coating kaolin, the soluble PVOH competes with the latex for adsorption sites on the pigment. Under the high‑shear conditions of a cylinder‑type blade coater (1500–1800 m/min web speed), the apparent viscosity measured at 10⁵ s⁻¹ with a Hercules hi‑shear viscometer falls in the range 35–45 mPa·s, compared with 55–70 mPa·s when the same dry‑parts ratio of a fully hydrolysed PVOH is substituted. This lower shear viscosity extends the blade runnability window by approximately 8–10 °C of backing‑roll temperature before the onset of discontinuous particle packing (known as “bleed”) at the blade tip. At the same time, the relatively low dry‑film glass transition temperature (Tg ≈ 68–72 °C, modulated DSC) of 080-44 results in a higher binder migration rate through the coating layer during drying. Cross‑sectional fluorescence microscopy of freeze‑fractured coatings dried at 120 °C for 30 s in an IR dryer showed that 080-44 enriched the surface layer by 5–8 % relative to the bulk, whereas a 98–99 mol% PVOH tended to concentrate at the coat‑base paper interface under identical drying conditions. This surface enrichment can be exploited to boost surface strength (IGT dry pick resistance, ISO 3783, increased by 12–15 % over a latex‑only formulation) but requires careful control of coating‑color pH between 7.5 and 8.2 to avoid excessive surface mottling linked to calcium stearate lubricant destabilisation.
Binder‑rich surface skins, when desired, are optimised by limiting the PVOH to 2–4 parts per 100 parts pigment and by adding the PVOH solution to the coating colour after the latex has thoroughly mixed with the pigment slip. Published data for the synergistic effect of 080-44 specifically on inkjet print density remains limited; preliminary trials using a K‑bar proofer and a thermal inkjet printer suggest a surface resistivity below 1 × 10⁹ Ω/sq at 50 % RH, indicative of sufficient antistatic behaviour without additional quaternary ammonium salts.
Formulation of a cold‑setting adhesive for spiral tube winding typically combines 080-44 with plasticised starch acetate and a minor fraction of borax or boric acid as a complexing agent. At 20 °C, a 10 wt% 080-44 solution, when titrated with 0.05 M boric acid solution in deionised water, exhibits a steep viscosity rise once the B(OH)₃-to‑vinyl alcohol molar ratio exceeds 0.02:1. The inflection point corresponds to the onset of gel network formation by formation of PVOH‑borate mono‑diol complexes. Practical adhesive recipes maintain this ratio between 0.008:1 and 0.015:1, producing a stable, thixotropic fluid with a setting time of 25–35 s on kraft paper (assessed by a cup‑down test). Substituting 080-44 with a 1799 grade of equivalent viscosity leads to unacceptable pre‑gelation at the same borate level because the higher density of contiguous 1,3‑diol segments facilitates interchain crosslinking. Further, 080-44’s lower minimum filming temperature (< 10 °C) allows bond formation even when the application environment drops to 5 °C, whereas fully hydrolysed grades form chalky, discontinuous films under these conditions. Industrial-scale VK‑type reactor trials reported that adhesive formulations containing 080-44 maintained an open time of 18–22 min on unbleached linerboard at 23 °C and 50 % RH, sufficient for automated assembly of five‑ply corrugated board on a BHS corrugator running at 250 m/min.
The compatibility of 080-44 with polyvinyl acetate (PVAc) homopolymer emulsions—often used to tailor wet tack—is governed by the solubility parameter disparity, which is minimised at a hydrolysis range near 80 mol%. A 30:70 blend of 080-44 aqueous solution (10 wt%) and a PVAc homopolymer emulsion (50 % solids, Tg 40 °C) exhibits no macroscopic phase separation after 7 days at 40 °C. However, prolonged storage at >50 °C induces transesterification side reactions that increase the intrinsic viscosity, and the blend should be formulated with 0.1 % sodium acetate buffer to retard the pH drift toward acidity that accelerates this process.
Blown‑film extrusion of 080-44 compounded with 12–18 wt% glycerol on a single‑screw extruder (L/D 30:1, compression ratio 3:1, barrel temperature profile 120–160–175–180 °C from feed to die) yields a film that is soluble at 15 °C in less than 60 s (MSTM‑205 solubility test). Unsupported tubular film of 50 µm gauge shows a tensile strength at break of 18–22 MPa in the machine direction and an elongation of 350–420 % (ASTM D882, 500 mm/min). Heat‑seal strength measured at 140 °C, 0.3 MPa, 1 s dwell time on a laboratory impulse sealer reaches 12–14 N/25 mm. The low‑hydrolysis polymer’s susceptibility to plasticiser migration, however, is more pronounced than in films based on 88 mol% hydrolysis grades; accelerated testing at 40 °C and 75 % RH for 72 h resulted in a 15–20 % loss of glycerol content, accompanied by a stiffening that raised the tensile modulus by 30–40 %. Consequently, for packaging of pre‑measured agrochemical powder sachets exposed to storage conditions above 30 °C, manufacturers apply a secondary over‑pouch of aluminium‑lined PET/PE laminate to function as a moisture barrier and minimise plasticiser equilibration with the environment. When the inner soluble pouch contacts alkaline substances (e.g., sodium carbonate laundry additives), the pH rise accelerates dissolution but also triggers partial saponification of the residual acetate groups, releasing acetic acid that can corrode mild‑steel filling‑machine contact surfaces unless 316 L stainless steel or high‑density polyethylene components are specified for all product‑contact parts.
| Operation | 080-44 behaviour | 088-50 difference | 1799 difference |
|---|---|---|---|
| Cold‑water dissolution (15 °C) | Complete solubilisation in 60–90 min at 800 rpm | Requires >2 h; slight residual gel particles | Insoluble; requires >85 °C cooking |
| High‑shear viscosity (10⁵ s⁻¹) | 35–45 mPa·s | 48–58 mPa·s | 55–70 mPa·s |
| Adhesion to PET (peel force) | 2.5–3.0 N/25 mm | 3.0–3.5 N/25 mm | 1.2–1.8 N/25 mm |
| Film tensile strength (50 µm) | 18–22 MPa | 24–28 MPa | 35–45 MPa |
| Boric acid gelation threshold | >0.02:1 molar ratio | >0.01:1 molar ratio | Gels below 0.005:1 |
| Plasticiser retention (40 °C / 75 % RH) | 80–85 % retained after 72 h | 90–95 % retained | Not applicable (film insoluble unless heated) |
The decision to select 080-44 over 088-50 frequently hinges on the cold‑water solubility requirement or the need to avoid borate‑induced gelation in adhesive systems, while the contrast with 1799 is driven by the latter’s unsuitability for any ambient‑temperature aqueous processing. In foam susceptibility, 080-44 exhibits a surface tension of 42–44 mN/m at 4 wt% (du Noüy ring, ASTM D1331), slightly lower than that of fully hydrolysed grades (46–49 mN/m), which promotes wetting but also stabilises foam under high‑shear mixing; defoamer usage in paper‑coating applications typically increases by 0.02–0.05 wt% (on total wet‑end starch) when substituting 1799 with 080-44 in a Vits coater supply system.
