| HS Code | 166897 |
| Product Name | Wanwei PVA 19-99(H) (PVA 100-30) |
| Cas Number | 9002-89-5 |
| Chemical Formula | (C2H4O)n |
| Appearance | white granular powder |
| Average Polymerization Degree | 1900 |
| Degree Of Hydrolysis | 99.0-100.0 mol% |
| Viscosity 4pct Aqueous Solution 20c | 30.0 ± 3.0 mPa·s |
| Ph Value 4pct Aqueous Solution | 5.0-7.0 |
| Volatile Content | ≤5.0% |
| Ash Content | ≤0.5% |
| Average Molecular Weight | ~83,000 |
| Density | 1.25-1.35 g/cm³ |
| Melting Point | 220-240°C |
| Solubility | soluble in hot water above 90°C; insoluble in common organic solvents |
| Thermal Decomposition Temperature | ~200°C |
As an accredited Wanwei PVA 19-99(H) (PVA 100-30) factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Wanwei PVA 19-99(H) (PVA 100-30) is packaged in 25 kg multi-wall paper bags with an inner plastic liner. |
| Container Loading (20′ FCL) | 20′ FCL container loading of Wanwei PVA 19-99(H) ensures safe, efficient transport with proper packaging and ventilation. |
| Shipping | Ship as a non-hazardous, water-soluble polyvinyl alcohol powder. Pack in sealed moisture-proof bags or drums, then place in clean, dry containers. Avoid exposure to rain, humidity, and direct heat. Keep away from ignition sources and incompatible materials. Handle gently to prevent dust generation and ensure stable stowage. |
| Storage | Store Wanwei PVA 19-99(H) in a cool, dry, well-ventilated area, away from heat, open flames, direct sunlight, and incompatible materials. Keep containers tightly sealed to prevent moisture absorption and dust formation. Avoid creating airborne dust; use appropriate handling controls. Maintain moderate humidity and stable temperatures to preserve product quality and prevent caking. |
| Shelf Life | Shelf life is typically 2 years when stored sealed in a cool, dry place away from moisture. |
In alkaline fine paper and coated white-top liner production, surface strength deficits manifest as dry linting and wet pick during offset lithography. Wanwei PVA 19-99(H), with a 4% aqueous solution viscosity of 27.0–33.0 mPa·s and hydrolysis degree exceeding 99.0 mol%, functions not merely as a film former but as a boundary lubricant reducing inter-fiber friction during calendering. The standard online size-press configuration—a Metso OptiSizer or Voith SpeedSizer running at 800–1,500 m/min—demands a size solution solids content maintained between 10.5% and 13.5%. Within this liquor, PVA 19-99(H) typically constitutes 18–30% of total solids when co-binded with oxidized corn starch (carboxyl content 0.4–0.8%). A formulation adding 0.8–1.2 dry parts of PVA per 100 parts of starch decisively shifts the IGT dry pick resistance from below 2.5 m/s (starch-only) to above 3.8 m/s as measured per ISO 3783:2006. The elevated molecular weight (DP approx. 1950–2050) introduces a processing conflict: the Brookfield viscosity of the cooked blend at 65°C must not exceed 180 mPa·s to prevent film split misting and spatter on the transfer roll. Operators compensate by reducing starch jet-cooker temperature to 125°C to inhibit PVA thermal chain scission and using 60–80 µm chrome-ceramic rod metering elements. A documented failure mode on dual-nip flooded-nip presses involves PVA concentration overshooting 1.6 dry parts, leading to glassy film formation that blocks sheet porosity. This reduces binder migration during coating and causes Heidelberg SM 102 blanket piling at impressions exceeding 120,000 sheets, with a resolubilization lag measured via ultrasonic attenuation that exceeds 340 milliseconds. End products segmented under this method include ISO 12647-2 compliant multi-color art paper and EN 71-3 safety-compliant packaging board where no mineral oil barrier is required. When producing grades destined for HP Indigo liquid toner presses, the PVA inclusion must remain at the lower 0.6 dry part boundary; higher levels interact with the ethylene-acrylic acid copolymer in the ElectroInk to generate a micro-scale orange-peel effect observable via atom force microscopy in the blanket image zone, quantified by a roughness (Sq) deviation exceeding 18 nm.
The incorporation of Wanwei PVA 19-99(H) into a cementitious matrix operating under suction—specifically a C2TE-class thin-bed tile adhesive conforming to EN 12004:2017—is a matter of rheology under tension, not dry strength alone. Dispersed at a rate of 0.25–0.50 wt% of the total dry formulation, the polymer participates in a pore fluid viscosity jump from approximately 1.2 mm²/s (neat water) to a non-Newtonian regime. This modification becomes critical when the troweled bed is exposed to an open time of 30 minutes at 23°C/50% RH on a medium-absorption concrete substrate with a capillary water absorption coefficient of 0.5 kg/(m²·min⁰·⁵). Testing per EN 1346:2007 reveals that a formulation relying solely on cellulose ether (e.g., hydroxypropyl methylcellulose with a viscosity of 40,000 mPa·s) suffers an adhesive strength decay to below 0.5 N/mm² under these conditions. The synergistic mechanism between PVA 19-99(H) and the cellulose ether is a two-stage dissolution: the PVA powder dissolves with a temporal lag behind the methoxyl substitution-driven hydration of the cellulose ether, establishing a time-phased water retention mechanism. When combined with a melamine-sulfonate superplasticizer at 0.3 wt%, the PVA addition must stay strictly below 0.35 wt%; exceeding this threshold triggers a hydration-inhibiting chelation effect, where the hydrolyzed acetate groups temporarily complex Ca²⁺ ions from the initial C₃S dissolution, pushing the Vicat initial set time beyond 1,450 minutes—a condition explicitly prohibited in DIN 18555-2 for floor-applied mortars. A validated formulation for a deformable S2 adhesive obtains a transverse deformation of 3.8 mm (exceeding the 2.5 mm minimum) under EN 12002:2008 using 0.35 parts of PVA 19-99(H) and 4.5 parts of a VAE redispersible powder. The grade also proves indispensable in cementitious waterproof slurries applied at 2.5 kg/m² dry thickness in multiple lifts; here, a 0.60 wt% dose (defoamed with 0.08 wt% mineral oil concentrate) eliminates crater defects that would otherwise arise from the lower-molecular-weight grades’ excessive foam stabilization, measured via a Matthis lab coater drawdown as a reduction of pore density from 42 per dm² to less than 6 per dm². Finished construction products include ETAG 004-certified external thermal insulation composite systems (ETICS) base coats exhibiting crack bridging exceeding 0.8 mm at -10°C.
In high-density woven fabric production—specifically TC 65/35 poplin with warp density above 90 ends/inch and a cover factor exceeding 24 —the sizing formulation operates under a fundamental constraint: the size film must exhibit a cohesive energy density sufficient to resist abrasion from a 350 rpm Dornier air-jet loom’s relay nozzles without causing the hardened size to fracture at the bust rod splitting point. Wanwei PVA 19-99(H) is cooked in a high-pressure jet cooker at 130°C for 25 minutes to ensure complete dissolution of the partially crystalline segments, yielding a size liquor with a solids concentration of 8.5–10.0%. The sheer molecular weight imposes a size-box viscosity—stabilized at 92°C via a direct-steam injection trough—of 63–78 mPa·s (Brookfield LV, spindle #2, 60 rpm), which is the upper limit for size penetration into a Ne 40 combed cotton warp. An often-misapplied formulation variable is the addition of a defatted corn starch extender; when the starch fraction exceeds 35% of total solids, retrogradation during the cooling phase inside the weaver’s beam generates a heterogeneous polymolecular blend resulting in size shedding measured at 4.8 mg/kg of warp yarn during weaving—an order of magnitude above the acceptable 0.5 mg/kg shedding threshold per ASTM D5646-18. The desizing performance in a subsequent rope-form washbox, operating at 95°C with 0.5 g/L of an amylase-oxidative desizing agent, must disintegrate the PVA film to soluble fragments within 22 seconds of immersion; this is verified via a residual PVA detector using the iodine-boric acid colorimetric spot test. A documented incompatibility occurs when the warp yarn is pretreated with an amine-functional softening agent; the residual surface amine groups react with the partially acetylated sequences of PVA 19-99(H) during the drying can chain (135°C surface temperature), forming a transient imine structure that yellows the size film and reduces subsequent CIE whiteness index of the bleached finished fabric by 4.2 points. Terminal fabric types include ISO 3175-compliant dry-cleanable worsted suiting interlinings woven with a 0.8 dpf microfiber weft insertion, where the PVA size serves as the sole temporary binding agent owing to its ash content below 0.5% eliminating charring on the heat-setting stenter.
The description of Wanwei PVA 19-99(H) as a “primary dispersant” in vinyl chloride monomer suspension polymerization undersells its role as a thermodynamic partitioning agent at the 30–35% conversion point, precisely when the monomer-rich viscous phase transitions to a continuous polymer gel. An addition ratio of 500–800 ppm relative to VCM weight, dosed into a 105 m³ non-baffled autoclave agitated by a three-blade Brumagin impeller at 97–115 rpm, produces a surface tension reduction to 42–45 mN/m at the monomer-water interface. The high 99% hydrolysis degree creates a “tight” steric stabilization barrier; this limits the coalescence of primary nuclei during the critical droplet breakage period at 3–6% conversion, directly setting the final resin grain porosity measured via cold plasticizer absorption (CPA) per ASTM D3367-21. A grain porosity of 0.28–0.32 cm³/g is reliably achieved, but only if the temperature polymerization profile is held at 56.5°C ± 0.3°C; a deviation to 57.5°C lowers the interfacial elasticity modulus provided by the high-DP PVA chains, causing an uncontrolled broadening of the particle size distribution (PSD) where the 80 mesh screen residue escalates past the 1.0% maximum specified for SG-5 suspension resin. The processing bottleneck for the PVC compounder arises because pure PVA 19-99(H)-stabilized grains present a “closed skin” morphology, severely restricting the rate of dioctyl phthalate (DOP) uptake during high-speed hot mixing at 4,500 rpm in a ThyssenHenschel FM350 mixer; the dry-up time extends beyond 14 minutes. The consequent formulation protocol mandates co-stabilization with a lower-hydrolysis (72–80 mol%) PVA grade at a master-blended ratio of 1.0 : 0.6 (19-99 : 80-series). This binary dispersant system creates a heterogeneous skin of interspersed high-density and low-density PVA domains, giving the grains a “cauliflower” surface texture quantifiable via mercury intrusion porosimetry as an increase in median pore throat diameter from 0.8 µm to 2.1 µm. The trustworthiness boundary extends to post-polymerization stripping: residual acetyl groups in the PVA float to the slurry surface during double-disc steam stripping at 0.08 MPa gauge pressure, generating a stable foam layer if the slurry pH is below 6.8. A foam height exceeding 18 cm in the stripping column’s sight glass—corrected via a 0.3 wt% sodium hydroxide solution metered into the slurry blowdown tank—indicates an unreacted VCM desorption inhibition linked directly to the 19-99(H) grade’s high interfacial surface coverage. Terminal resin grades span from SG-5 pipe compound (K-value 66–68) to SG-3 cable-grade resin requiring a K-value of 72–73 and a minimum electrical volume resistivity of 1.0×10¹² Ω·m post-aging in 100°C deionized water per IEC 60502-1.
A two-part crosslinking wood adhesive for Type I structural fingerjointing, evaluated under the boiling water durability cycle of ANSI/HPVA HP-1-2016, relies on Wanwei PVA 19-99(H) as the backbone polymer for its cohesive strength at low strain rates. The resin component is an 11.5–13.5% aqueous PVA solution, prepared under a variable-speed Cowles disperser at a maximum vortex temperature of 88°C. The functionality of the 99.9% transmissivity film (visible light, 12 µm dried thickness) as a barrier against acid-catalyzed hydrolysis from the wood’s hemicellulose fraction during the 4-hour boil-dry-boil cycle in EN 391:2001 is the primary differentiator from EVA-based glues. To achieve a creep resistance factor exceeding 0.80 (ratio of residual strength after 7 days sustained load at 60°C), the formulation introduces a blocked polymeric MDI (isocyanate) crosslinker at 15±1 parts per 100 parts of PVA solution liquid weight, catalyzed by 0.05 parts of triethylenediamine (TEDA) diluted to a 10% solution. A strictly enforced manufacturing constraint is the pot life window of 55–65 minutes at 20°C; after this period, the onset of carbamate crosslinking elevates the mix viscosity from an initial 28,000 mPa·s (Brookfield HAT, spindle #7, 10 rpm) to beyond 65,000 mPa·s, causing incomplete wetting of the Douglas fir adherend at a spread rate of 180 g/m². A process specification for the radio-frequency (RF) curing press requires the adhesive bond line temperature to reach 72°C within 2.5 minutes under a 13.6 MHz field; the dielectric loss factor of the PVA 19-99(H) at this frequency is sufficiently high to prevent thermal runaway during the RF dwell, unlike alternative high-hydrolysis PVAs that have exhibited localized char at the glue line center, observable as a 2–4 mm wide blackened streak in post-destructive tapping block lathe inspection. The wood failure percentage of a properly cured bond after the vacuum-pressure cycle of EN 302-1:2013 Adhesive Type I consistently remains above 85%, with the failure mode transitioning from adhesive to substrate fiber tear. Laminated products include structural glulam beams certified to EN 14080:2013 with an initial shear strength not less than 6.0 N/mm² on beech and laminated oak floor planks with a moisture content range of 6.5±1.0% during assembly.
Extruding thin-gauge water-soluble polyvinyl alcohol films at commercially viable line speeds introduces a vertical temperature gradient control problem at the flat die lip—a problem that Wanwei PVA 19-99(H) mitigates through a narrower melt transition due to its minimal residual vinyl acetate fraction. The compound, pelletized on a twin-screw extruder with a 34:1 L/D ratio, must be pre-dried in a dehumidifying hopper dryer operating at a dew point of -45°C and a bed temperature of 68°C for 5 hours, bringing the moisture content below 0.30% (tested via Toledo halogen loss) to suppress steam bubble formation in the melt. A typical formulation for a peripheral embossed laundry bag film combines 74.5 wt% of PVA 19-99(H) with 16.0 wt% of a mixed plasticizer system (glycerol and triethylene glycol diacetate at a 1:1.2 ratio) and 8.0 wt% of a native corn starch co-processed at an extruder barrel temperature profile rising from 165°C in zone 1 to 212°C at the segment before the melt pump. The processing window at the coat-hanger die is restricted to 207–212°C; operation at 216°C accelerates the elimination of water from the 1,3-diol units in the polymer backbone, producing detectable allyl-type unsaturation (UV absorbance at 280 nm exceeding 0.25 A for a 0.1% filtrate), which is a precursor to insoluble gel specks estimated at 8–12 specks/m² in the final 35 µm film. The chilled casting roll temperature is setpoint at 14°C to generate a quench depth of 32 µm, establishing a biaxially amorphous layer that prevents immediate crystallization-driven embrittlement. A critical downstream fabrication property is the high-frequency sealing window; the PVA 19-99(H)-dominant film exhibits a seal initiation temperature of 68°C under a 0.4 MPa jaw pressure and 0.8-second dwell time in an RF sealer oscillating at 27.12 MHz. The final dissolution behavior in pH-adjusted water at 15°C shows a complete fragmentation time of 45 seconds in buffer solutions of pH 6.8 and 38 seconds in pH 8.2, making it unacceptable for cold-water consumer sachets requiring a 10°C disintegration threshold per ISO 14851 biodegradation test media specifications. Instead, the film targets unit-dose pesticide packets for agricultural use, where the median lethal concentration of the effluent PVA in aquatic model organisms (Daphnia magna chronic NOEC) remains above 100 mg/L in accordance with OECD TG 211 test guidelines, qualifying it for groundwater protection areas.
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The Wanwei PVA 19-99(H) grade, also designated PVA 100-30 within the manufacturer’s internal nomenclature, is a fully hydrolyzed polyvinyl alcohol resin with a nominal viscosity of 28.0–32.0 mPa·s measured as a 4% aqueous solution at 20°C per DIN 53015. The degree of hydrolysis is controlled to 99.0–100.0 mol%, confirmed by ISO 15023-2 titration. Ash content, predominantly sodium acetate remnant from the saponification process, does not exceed 0.5 wt% (ISO 3451-1), while residual methanol and other volatiles are held below 5.0 wt%. The powder morphology is granular, with a particle size distribution optimized for hopper-fed dissolution systems: ≥95% retention on a 40-mesh screen and ≤1% through a 200-mesh screen, minimizing dust formation during pneumatic conveying.
| Property | 19-99(H) / PVA 100-30 | 17-99 (PVA 080-30) | 24-99 (PVA 130-30) | Test Method |
|---|---|---|---|---|
| Viscosity (4% aq., 20°C) | 28.0–32.0 mPa·s | 17.0–23.0 mPa·s | 34.0–40.0 mPa·s | DIN 53015 |
| Hydrolysis degree | 99.0–100.0 mol% | 99.0–100.0 mol% | 99.0–100.0 mol% | ISO 15023-2 |
| Ash content | ≤0.5 wt% | ≤0.5 wt% | ≤0.5 wt% | ISO 3451-1 |
| Film tensile strength | 50–65 MPa | 40–55 MPa | 55–70 MPa | ASTM D882-18 |
| Aqueous solution gelation | Strong thermoreversible gel upon cooling below 30°C | Moderate gelation, weaker network | Very firm gel, high structural recovery | Dynamic oscillatory measurement |
| Dissolution temperature (full solubilization) | ≥92°C under mechanical agitation | ≥90°C | ≥94°C | — |
The intermediate molecular weight of 19-99(H) places it in a processing corridor where film toughness exceeds that of 17-99 without incurring the viscosity-driven mixing torque spikes observed with 24-99 in high-solids adhesive batch kettles. The high hydrolysis level imparts near-complete water resistance to the final dry film, a property not achievable with partially hydrolyzed grades such as 17-88 (PVA 088-20) that retain hydrophilicity at room temperature. However, the fully hydrolyzed structure severely retards dissolution kinetics; attempts to cold-water swell the powder prior to cooking demand rigorous temperature ramping to avoid gel-particle “fisheye” defects that persist in downstream slot-die coatings.
In hot-melt adhesive formulations for paperboard lamination applied via slot-die at coating speeds of 150–250 m/min, substitution of 17-99 with 19-99(H) at equivalent solution concentration (15–20 wt% solids) raises the dynamic lap-shear adhesion to recycled linerboard by approximately 12–18% at 23°C and 50% RH, measured per ASTM D3163-01. The gain is attributed to higher cohesive strength and reduced interfacial failure under peel loading. On a Nordson ProBlue® melt-on-demand system operating at a barrel setpoint of 85°C, the viscosity increase relative to 17-99 is 18–22%, which remains within the pump’s maximum backpressure threshold of 80 bar provided the delivery hose is insulated to maintain solution temperature above 70°C. A processing conflict arises when the binder-to-filler ratio in the adhesive compound exceeds 1:0.7 by dry weight: the higher molecular weight amplifies filler sedimentation in the holding tank, necessitating continuous recirculation or the addition of 0.1–0.3 wt% xanthan gum to maintain suspension. Published data for this specific configuration with calcium carbonate fillers and 19-99(H) is limited, but site reports from a corrugated box plant indicate that batch-to-batch viscosity variation beyond ±0.5 mPa·s causes detectable coat weight drift exceeding ±1.2 g/m² when no in-line viscometer feedback control is installed.
Optimal dissolution of 19-99(H) for industrial coating require a cook temperature of 92–95°C sustained for 30–45 minutes under high-shear dispersion generated by a rotor-stator mixer with a tip speed of 15–20 m/s. The powder must be fed gradually at a rate not exceeding 0.3 kg/min per 100 L of heated water to prevent lump agglomeration. At ambient relative humidity exceeding 60%, the material absorbs moisture within 4 hours of exposure, shifting the measured volatiles above 5.0 wt%; this condition promotes arching in loss-in-weight feeders and is mitigated by pre-drying the resin in a fluidized-bed dryer at 55°C for 2 hours prior to use. When utilizing a ZSK 25 mm twin-screw extruder (L/D 40:1) for reactive compounding with boron-based crosslinkers, the maximum recommended screw speed is 200 rpm to limit shear heating that could trigger incipient gelation in the transition zone, where localized melt temperature must remain below 75°C. Amine-based additives, including many alkanolamine corrosion inhibitors, must be avoided because they catalyze chain scission at processing temperatures, resulting in a 5–8% drop in solution viscosity after 24 hours of ageing at 40°C.
In emulsion polymerization served as a protective colloid for vinyl acetate homopolymers, 19-99(H) imparts a higher degree of grafting than 17-99, evidenced by a reduction in surface tension of the resulting latex from 48 mN/m to 42 mN/m at 0.5% colloid concentration on monomer, measured by the Du Noüy ring method per ISO 304. The grafted layer thickness, as estimated from dynamic light scattering of washed latex particles, increases by 6–9 nm, improving steric stabilization and reducing coagulum formation during seed-stage polymerization. However, the larger hydrodynamic volume of the protective colloid fraction elevates the minimum film-forming temperature of the latex by 3–5°C relative to systems stabilized with 17-99, which may necessitate the addition of 2–4 wt% of a coalescing solvent such as butyl carbitol to achieve continuous film formation at 5°C per ASTM D2354-10.
Replacement scenarios demand careful adjustment of size box viscosity. In a cotton-polyester blend slashing operation running at 60 m/min with a size box target viscosity of 11–13 mPa·s (measured by ISO 12058-1 falling ball viscometer at 80°C), shifting from 24-99 to 19-99(H) allows a reduction in size add-on from 12.5% to 10.8% while maintaining equivalent weaving efficiency because the lower solution viscosity improves penetration into the yarn bundle, reducing surface layering that causes shedding. Abrasion resistance of the sized yarn, determined by a Shirley tester under 300 cycles of reciprocating abrasion, drops by 7–10% compared to 24-99, which is counterbalanced by a 12% improvement in elongation at break of the size film, preventing brittle fracture during loom shedding. In split-cylinder drying at 120°C cylinder surface temperature, the faster water release from the lower-viscosity size reduces energy consumption by roughly 6% per meter of woven fabric. A documented failure mode occurs when the size recipe includes a high fraction of oxidized starch: the molecular weight difference between 19-99(H) and 24-99 amplifies phase separation in the mixed paste, leading to skin formation on the size box surface after 20 minutes of quiescent holding. This is suppressed by maintaining continuous circulation and limiting temperature hold time to 15 minutes.
For filament yarns with a denier below 75D, 19-99(H) provides a balance of film flexibility and adhesion to PET substrates without requiring a plasticizer. The size film, cast from a 7 wt% solution and dried at 105°C, exhibits a Young’s modulus of 3.2–3.8 GPa (ASTM D882-18), sufficient to resist yarn flattening under warp tension exceeding 0.22 cN/dtex. Processing limitations emerge when the size liquor temperature falls below 78°C inside the box: the solution transitions into a weak gel state that unevenly coats the filaments, causing periodic tension spikes detectable on the in-line tensiometer. Published data for this specific configuration is limited, but mill records from a flat-yarn weaving plant indicate that molecular weight variation between production lots must stay within ±1.5% of the target intrinsic viscosity to maintain a ≤2% warp break rate at loom speeds of 550 picks/min.
In architectural coatings formulated with kaolin and titanium dioxide, 19-99(H) is used as a sacrificial barrier coating on masking tapes. The product is cast into a 12 μm film via a comma coater on creped paper substrates. Wetting of heavily plasticized liners presents a transient defect: surface defects count increases by 0.3 per m² for each 1°C drop in coating solution temperature below 70°C due to viscosity buildup at the metering gap. Pre-heating the backing paper to 38°C with infrared panels stabilizes the contact angle below 30° and eliminates ribbing. Tests according to FINAT FTM-1 show 180° peel adhesion to stainless steel of 3.5–4.2 N/25 mm, essentially identical to values obtained with 17-99, but with a reduction in edge ooze after 7 days at 50°C from 2.1 mm to 0.9 mm, a critical parameter for die-cut label stock. This improvement is attributed to the higher storage modulus of the fully hydrolyzed film above its glass transition temperature, measured by DMA at 1 Hz to be 2.8 GPa at 120°C. Interaction with residual acetic acid emanating from polyolefin facestocks is negligible at pH 5–7, but at pH below 4.0 the film undergoes a 3% mass loss over 30 days due to acid-catalyzed hydrolysis, a limitation shared by all fully hydrolyzed PVA grades and confirmed by immersion testing per ISO 175:2010.
| Specification Parameter | Typical Value | Analytical Standard |
|---|---|---|
| Viscosity (4% aq., 20°C) | 28.0–32.0 mPa·s | DIN 53015 |
| Degree of hydrolysis | 99.0–100.0 mol% | ISO 15023-2 |
| pH (4% solution) | 5.0–7.0 | ISO 976 |
| Ash content | ≤0.5% | ISO 3451-1 |
| Volatiles | ≤5.0% | ISO 15512 |
| Screen residue (>40 mesh) | ≥95% | — |
| Acetyl content | ≤0.15% | ISO 1157 |
The grade’s sensitivity to metal salt contamination is pronounced: iron content above 10 ppm catalyzes oxidative chain scission during solution storage at elevated temperature, evidenced by a loss of 0.8 mPa·s per day at 60°C. Consequently, dissolution vessels and storage tanks must be constructed of SS316L or lined with glass-frit, and the water supply must be deionized to a conductivity below 5 µS/cm. REACH and RoHS compliance is maintained under a supplier declaration; the product is listed under CAS 9002-89-5 with no reportable substances above the threshold of 0.1 wt%.
For paper surface sizing with alkyl ketene dimer (AKD) emulsions, 19-99(H) elevates the Cobb60 water absorptiveness (ISO 535:2014) resistance at a lower binder consumption than 17-99. In mill trials on a twin-wire paper machine producing 90 g/m² linerboard, addition of 0.6 kg/ton dry PVA into the size press solution reduced Cobb60 values from 35 g/m² to 22 g/m², whereas 17-99 required 0.9 kg/ton to achieve the same level. The film-forming temperature at the size press nip, typically 65–70°C, must be maintained within ±3°C to prevent insoluble gel fragments from transferring to the sheet surface, a phenomenon that correlates with a rise in rejected reels by 4% for each 5°C deviation below the setpoint. This thermal sensitivity is sharper than the behavior of 17-99 and reflects the stronger hydrogen bond network that forms in the high-hydrolysis polymer as it cools through its upper critical solution temperature.
