Sinopec PVA 080-22

Why Does 080-22 Outperform Fully Hydrolyzed Grades in Biodegradable Mulch Film Extrusion?

Agricultural mulch films constructed from polyvinyl alcohol-based formulations represent one of the few genuinely biodegradable alternatives to polyolefin films that do not rely on oxo-degradable additive packages of contested environmental validity. The criterion for soil biodegradability under ambient conditions is defined by EN 17033:2018, which mandates a mineralization threshold of ≥90% within 24 months in natural soil at 20–28°C without prior composting. PVA 080-22, when processed via cast film extrusion on a single-screw extruder with an L/D ratio of ≥30:1 and a barrier-type Maddock mixing section, achieves a stable melt between 185–210°C, above its crystalline melting range but below the onset of thermal degradation which accelerates sharply beyond 220°C due to chain scission and formation of conjugated polyene sequences detectable by UV absorbance at 280 nm. The incorporation level in the final film formulation typically falls between 60–75 wt% of total polymer mass, with the balance comprising biodegradable polyester copolymers such as poly(butylene adipate-co-terephthalate) (PBAT) at 15–30 wt%, a plasticizer system of glycerol and/or sorbitol at 8–15 phr, and a processing lubricant such as food-grade stearic acid at 0.5–1.5 phr. A critical production bottleneck manifests when relative humidity in the post-extrusion conditioning zone exceeds 60%: the partially hydrolyzed grade absorbs atmospheric moisture to a saturation point of 8–12 wt%, causing blocking on wind-up rollers unless the film is interleaved with a siliconized release liner or dusted with maize-derived starch powder at 0.1–0.3 g/m². The resulting film, at a gauge of 12–25 µm, is deployed as soil-contact mulch for short-cycle horticultural crops including strawberry, tomato, and lettuce, where it degrades in situ without retrieval, addressing labor cost burdens associated with conventional polyethylene film removal and disposal. Adherence to the European standard for compostable packaging, EN 13432:2000, is documented when the film disintegrates to ＜2 mm fragments within 12 weeks and exhibits no ecotoxicological effects on plant germination per OECD 208.

In water-soluble packaging for pre-weighed agrochemical doses—such as water-dispersible granule sachets containing insecticidal or fungicidal active ingredients—the same grade is incorporated into a cast film at 85–95 wt% PVA content with the remainder plasticizer and anti-block. The dissolution time in water at 10°C, measured by the disappearance of a 50 mm × 50 mm film coupon under mild agitation per an internal method derived from ISO 14851:2019, falls below 60 seconds at a film thickness of 35–40 µm. This dissolution kinetics profile avoids the delayed-release failures observed with fully hydrolyzed grades that require water temperatures above 30°C to dissolve completely, a condition inconsistent with field mixing in unheated agricultural spray tanks. The packaging application must comply with UN Model Regulations for the transport of dangerous goods when the contained pesticide is classified, requiring that the sachet maintain mechanical integrity under a drop test from 1.2 m height and a stacking test at 3 m for 24 hours without rupture—properties that depend on the film's tensile strength at break (typically 35–50 MPa for PVA 080-22 film per ASTM D882-18) and elongation at break (150–250%).

Polyvinyl Acetate Homopolymer Glue Formulated with Polyvinyl Alcohol Protective Colloid

The emulsion polymerization of vinyl acetate monomer (VAM) to produce polyvinyl acetate (PVAc) homopolymer woodworking adhesives relies on a protective colloid system that governs particle size distribution, latex stability against mechanical shear, and ultimately the set time and tack of the formulated adhesive. PVA 080-22 functions as the primary protective colloid at a loading of 3.0–5.5 wt% relative to total emulsion weight, dissolved in the aqueous phase prior to the initiation of free-radical polymerization. The partially hydrolyzed structure provides both hydrophilic segments—the vinyl alcohol units that extend into the aqueous phase and electrosterically stabilize the growing polymer particles—and hydrophobic residual acetate blocks that anchor to the PVAc particle surface, a dual functionality absent in fully hydrolyzed grades that lack sufficient surface activity. The polymerization is carried out in a jacketed stainless-steel reactor equipped with an anchor agitator operating at 60–120 rpm and a reflux condenser; initiation occurs via a redox pair of ammonium persulfate and sodium metabisulfite at 65–70°C, with a monomer delay feed over 3–4 hours. The resulting latex exhibits a Brookfield viscosity of 8,000–25,000 mPa·s at 25°C, a solids content of 50–55%, and a mean particle diameter of 0.5–1.5 µm as measured by laser diffraction. When formulated into a finished wood adhesive with the addition of a polyvalent metal salt crosslinker such as aluminum chloride at 0.5–1.0 wt% on wet adhesive weight, the assembly time on a standard beechwood substrate is 8–12 minutes at 23°C and 50% RH, and the D3 water resistance classification per EN 204:2016 is achievable. Adhesive bond strength under dry conditions per EN 205:2016 typically exceeds 10 N/mm², and the value after 4 hours of cold-water immersion must remain above 2 N/mm² to satisfy the D3 criterion, a performance level attainable with PVA 080-22-stabilized emulsions but manifesting sensitivity to the precise ratio of protective colloid to monomer: exceeding 6 wt% PVA loading drives water sensitivity of the adhesive film beyond acceptable limits due to the inherent solubility of the protective colloid phase in the dried bond line.

Paper converting operations, particularly the spiral winding of paperboard tubes and cores for the textile and packaging industries, require an adhesive that develops immediate green tack upon contact under minimal pressure to prevent unwinding of the plies. A solution of PVA 080-22 in water at 15–20 wt% solids, prepared by dispersing the resin in cold water and heating the slurry under continuous agitation to 85–90°C for 30 minutes until a clear, particle-free solution is obtained, delivers a viscosity profile of 1,200–2,000 mPa·s at 25°C that allows transfer via a roller applicator system to the advancing paper web at line speeds of 30–60 m/min. The open time—the interval during which the adhesive surface remains sufficiently receptive to bond—is 15–25 seconds on uncoated kraft paper of 120–200 gsm basis weight, an interval compatible with the short distance between the glue application station and the winding mandrel. The standard for spiral tubes used in textile yarn winding, ISO 11093-4:2022, includes a radial crush strength test performed on a universal testing machine at a crosshead speed of 10 mm/min; tubes bond with PVA 080-22 adhesive at an application coat weight of 8–12 g/m² (dry) per interlayer interface consistently display crush strengths in excess of the minimum specification required for the tube diameter class. Because the adhesive film is thermoplastic and water-reversible, the end product is not suited for exposure to high-humidity environments exceeding 80% RH or direct liquid water contact unless a post-winding water-resistant overprint varnish is applied to the outer ply.

**Table 1:** Emulsion viscosity and particle size as function of PVA 080-22 protective colloid loading in batch PVAc polymerization at **50%** target solids, initiator **0.3 wt%** APS on VAM.
PVA Loading (wt% on emulsion)	Latex Viscosity (mPa·s, 25°C)	Mean Particle Diameter (µm)	Coagulum on 100-mesh screen (ppm)
3.0	8,200–9,500	1.2–1.5	350–500
4.0	12,000–15,000	0.9–1.2	120–200
5.0	18,000–24,000	0.6–0.9	＜50

When Polyvinyl Alcohol Replaces Gelatin in Textile Warp Sizing: Operational Boundaries and Equipment Implications

Cotton and cotton-blend warp yarn sizing, conventionally reliant on starch, modified starch, and in high-performance applications on gelatin or polyacrylic acid esters, encounters recurring limitations when the sizing agent must be removed via a low-temperature desizing bath in integrated finishing plants where energy recovery from hot wastewater has not been implemented. PVA 080-22, applied as a 7–12 wt% aqueous solution at 60–70°C by a multi-cylinder sizing machine of the Sucker or Karl Mayer type with a double-squeeze roller configuration set to a nip pressure of 0.5–3.0 MPa (depending on yarn count), yields a size add-on of 8–15% on Ne 20–40 ring-spun cotton yarn. The partially hydrolyzed grade permits desizing in water at 20–30°C without enzymatic or oxidative agents, reducing the chemical oxygen demand (COD) load of the desizing effluent compared to starch-based sizes that require α-amylase degradation at 60–80°C and generate a biochemical oxygen demand (BOD₅) spike in the receiving water. The weaving efficiency, measured by loom stops per 100,000 picks on an air-jet loom operating at 700–900 rpm, improves relative to gelatin-sized warps when the ambient weaving shed is maintained at 60–70% RH, because PVA 080-22’s film flexibility prevents size shedding and dust generation at the drop wires and heald eyes, a chronic failure mode with brittle natural polymer films such as gelatin or carboxymethyl cellulose in low-humidity conditions. However, the size film’s moderate sensitivity to atmospheric moisture imposes a limitation: weaving at relative humidity below 45% causes electrostatic charging and size film fracture, manifested as increased warp breakage rates above 5 breaks per 100,000 picks. The relevant standard for size film performance evaluation is ISO 13936-1:2000 for woven fabric seam slippage resistance; a desized fabric must retain its original tensile strength per ISO 13934-1:2013 and exhibit extractable residue below 0.1% by weight—a condition verified by a cold-water extraction test followed by gravimetric analysis or potassium dichromate oxidation titration for residual PVA content in the fabric.

The industrial practice of adding a lubricant component—such as tallow-based hydrogenated fat at 2–4% of PVA weight—to the size formulation reduces the coefficient of friction of the dried size film against steel (measured by an inclined plane friction meter per an adapted ASTM D1894-14 method) from approximately 0.35–0.45 for unmodified PVA 080-22 film to 0.15–0.22, a reduction necessary for satisfactory performance on shuttleless looms where warp yarns undergo severe abrasion during reed beat-up. The tallow is emulsified into the PVA solution using a high-shear mixer at 3,000–5,000 rpm prior to transfer to the size box; emulsion stability must exceed 8 hours without phase separation at the box operating temperature to prevent non-uniform add-on across the warp sheet width.

Release films for composite component fabrication—such as polyester or epoxy resin-infused carbon fiber lay-ups for automotive structural parts cured in an autoclave or via vacuum-assisted resin transfer molding (VARTM)—are produced from PVA 080-22 by casting an aqueous solution of 10–18 wt% concentration onto a polished chrome-plated continuous belt heated to 80–100°C. The dry film, at a thickness of 30–50 µm, exhibits a tensile elongation of over 200%, permitting conformation to complex mold geometries without tearing. An important processing note: the dried film must be conditioned and stored at ＜40% RH to prevent dimensional change and blocking between adjacent film layers on the roll. In the VARTM process, where the release film is placed between the tool surface and the carbon fiber preform, the film’s water solubility permits mold cleaning by simple aqueous wash after cure, eliminating the solvent-based mold release agents that generate volatile organic compound (VOC) emissions subject to EU Directive 2010/75/EU limits on industrial emissions. Published rheological and release performance data for this specific grade in RTM processing environments remain limited; therefore, qualification trials on a representative mold geometry at the intended cure temperature (typically 120–180°C for epoxy systems) are essential to confirm that the PVA film neither distorts nor adheres to the cured part surface during the demolding operation.

**Table 2:** Summary of core application segments for PVA 080-22 with associated regulatory instruments and processing parameters.
Application	Addition Level (typical)	Regulatory or Standard Reference	Prohibited or Limiting Parameter
Biodegradable mulch film	60–75 wt%	EN 17033:2018; EN 13432:2000	Extrusion residence time at >220°C must be ＜2 min
Agrochemical PVA sachet	85–95 wt%	UN Model Regulations drop/stack test; ISO 14851:2019	Cold-water solubility impaired if film stock is heated above 160°C during conversion
PVAc emulsion protective colloid	3.0–5.5 wt%	EN 204:2016 D3; EN 205:2016	Avoid combining with amine-functional comonomers that complex with residual acetate
Spiral paper tube adhesive	15–20 wt% solution; 8–12 g/m² dry coat	ISO 11093-4:2022	Service RH must remain below 80% without water-resistant topcoat
Warp sizing agent	7–12 wt% solution; 8–15% add-on	ISO 13934-1:2013; ISO 13936-1:2000	Weaving shed RH ＜45% triggers electrostatic fracture of size film
Composite release film	10–18 wt% solution; 30–50 µm dry film	EU 2010/75/EU VOC; cure temp compatibility must be verified	Storage above 40% RH causes blocking between film layers

Partial Hydrolysis and the Functional Profile That Dictates Compatibilizer Performance in Polyolefin-Natural Fiber Compounds

Wood-plastic composite (WPC) decking and railing profiles, co-extruded with a foamed polyethylene or polypropylene core and a solid, weatherable cap layer, frequently incorporate a lignocellulosic filler—wood flour at 40–60 mesh particle size or rice husk flour of similar granulometry—at loadings of 50–70 wt%. The thermodynamic incompatibility between the hydrophilic filler surface and the hydrophobic polyolefin matrix manifests as poor filler dispersion, agglomeration, and a dramatic reduction in elongation at break and notched impact strength. PVA 080-22, compounded as a particulate compatibilizer at 2–6 wt% of the total formulation in a co-rotating twin-screw extruder with an L/D ratio of 40–44:1 and a screw profile incorporating three kneading block sections, bridges this interface: the residual acetate groups and the hydrophobic backbone segments associate with the polyolefin matrix through dispersive interactions, while the hydroxyl groups hydrogen-bond with cellulose microfibrils on the filler surface. The extrusion temperature profile, set with barrel zones from 160°C (feed throat) ramping to 195°C (die head), must avoid exceeding 210°C in any zone to prevent thermal degradation of the PVA component and the consequent evolution of acetic acid vapor detectable by its characteristic pungent odor and a pH < 4 in condensate collected at the vacuum vent port. The resulting compound, when injection-molded into test specimens per ASTM D638-14 Type I bars, exhibits a flexural modulus of 3,500–5,500 MPa per ASTM D790-17 and a notched Izod impact strength of 35–55 J/m per ASTM D256-23 at a filler loading of 60 wt% wood flour in a high-density polyethylene matrix. The standard for WPC decking products in the North American market, ASTM D7032-21, requires that the material sustain a design live load without creep failure and that the coefficient of thermal expansion, measured between −30°C and 60°C, remain below 5.0 × 10⁻⁵ mm/mm/°C—a requirement that the compatibilized formulation meets due to the constrained mobility of the polyolefin chains at the filler-matrix interface. Processing note: the PVA 080-22 powder must be pre-dried at 60–70°C for 4 hours in a desiccant dryer to a moisture content below 0.5% before addition to the twin-screw extruder feed throat; residual moisture above 1.0% causes steam-induced foaming and surface defects on the extruded profile that are visually unacceptable on uncovered deck board surfaces.

Sinopec PVA 080-22 is a partially hydrolyzed polyvinyl alcohol grade produced via continuous alcoholysis under tightly controlled alkali-catalyst conditions. Its residual acetyl content falls within the range of 10.0–12.0 mol%, corresponding to a hydrolysis degree of 88.0 ± 1.0 mol%. The 4 % aqueous solution viscosity at 20 °C, determined per ISO 3105:1994 using an Ubbelohde viscometer, is specified at 22.0–26.0 mPa·s. This combination places the product in the medium-viscosity, partially hydrolyzed segment of the polyvinyl alcohol spectrum, distinct from fully hydrolyzed grades such as Sinopec PVA 1799 (hydrolysis degree ≥ 98.5 mol%) or low-viscosity types like PVA 0588 (viscosity 5.0–6.5 mPa·s). The primary particle morphology—granular, with a bulk density typically between 0.40–0.60 g/cm³—favors controlled dissolution in cold-water processes without excessive lump formation, provided mechanical agitation exceeds 300 rpm.

Ash content (as Na₂O) remains ≤ 0.5 %, meeting the purity thresholds stipulated for indirect food-contact paper coatings under FDA 21 CFR §176.170 and for textile warp sizes destined for desizing operations. Volatile matter at 105 °C to constant mass is capped at 5.0 %, a parameter that must be confirmed before use in melt-processing applications where hydrolytic chain scission becomes kinetically favorable above residual moisture levels of 0.3 % during extrusion. The pH of a 4 % aqueous solution is maintained between 5.0–7.0, minimizing corrosion risk in mild steel storage vessels while maintaining compatibility with acid-catalyzed crosslinking systems.

How Does 080-22 Compare with Fully Hydrolyzed Grades in Cold-Water Solubility?

Where fully hydrolyzed PVA grades (e.g., PVA 1799) require water temperatures exceeding 85 °C for complete dissolution and remain prone to gelation upon cooling at concentrations above 7 wt%, PVA 080-22 dissolves readily in water at 15–25 °C within 40–60 minutes under moderate shear (Rushton turbine impeller, tip speed 1.5 m/s). This behavior stems from the steric disruption of crystalline sequences by residual acetate groups; the lamellar crystal thickness measured by small-angle X-ray scattering is typically 2.5–3.0 nm for partially hydrolyzed grades versus 5.5–7.0 nm for fully hydrolyzed analogues, reducing the energy barrier for water penetration. However, the same structural feature elevates the equilibrium moisture regain of dried films to 8–10 % at 65 % RH, compared to 4–5 % for PVA 1799, a factor that constrains 080-22’s use in humidity-sensitive barrier laminates unless a top-coat is applied.

The melt temperature depression is equally significant: differential scanning calorimetry at 10 K/min heating rate places the peak melting endotherm at 180–190 °C for PVA 080-22 versus 225–235 °C for fully hydrolyzed material, enabling a processing window on single-screw extruders (L/D 30:1) that avoids thermal decomposition onset near 200 °C. Yet, the lower melt temperature also reduces the heat-seal initiation temperature of water-soluble films by approximately 15–20 °C, demanding precise temperature profiling on form-fill-seal equipment to prevent premature tack at seal jaws.

Film Casting and the Balance of Tensile Strength versus Elongation

Cast films of Sinopec PVA 080-22, plasticized with 10–15 phr glycerol and conditioned at 23 °C / 50 % RH for 48 hours prior to testing per ASTM D882-18, develop tensile strengths in the range of 40–50 MPa with elongation at break between 200–280 %. The partial hydrolysis degree introduces a deliberate defect density in the hydrogen-bonded crystalline network; wide-angle X-ray diffraction reveals a crystallinity index of 28–32 %, which suppresses the brittle fracture mode observed in unplasticized fully hydrolyzed films (elongation typically < 10 %) without sacrificing the interchain cohesion needed for unit-dose detergent pod integrity. Phase-separation of plasticizer is rarely observed at glycerol contents below 18 phr, but storage at 40 °C and 80 % RH for 14 days induces surface tack and a loss of Young’s modulus of up to 35 %, attributable to water acting as a secondary plasticizer and reducing the glass transition temperature from approximately 45 °C (dry) to near 15 °C.

A production-scale weakness encountered on cast-film lines with polished chrome rolls is the tendency of 080-22 solution (prepared at 18–22 % solids) to form a skin layer on the casting surface when hot-air impingement velocity exceeds 3 m/s before the film enters the drying tunnel. This leads to orange-peel defects visible under oblique lighting. The countermeasure involves adjusting the initial drying zone to 65–70 °C with a gradual ramp to 95 °C, rather than applying high-temperature shock immediately post-extrusion.

Textile sizing operations on high-speed rapier looms (weaving speeds exceeding 650 picks/min) exploit the adhesion profile of PVA 080-22 to cotton and polyester-cotton blends. The solution, formulated at 8–10 % solids with a minor addition of lubricant wax (typically 0.2–0.5 wt% on size liquor), deposits a film that reduces hairiness index (measured by Zweigle G565) by 55–70 % relative to unsized yarn. Its intermediate degree of hydrolysis ensures adequate water solubility for enzymatic or oxidative desizing—less than 5 minutes to dissolve the size film from a 2 m fabric section in a wash box at 80 °C—while resisting premature removal from warp yarns at relative humidity spikes in the weave shed up to 75 %. By contrast, low-viscosity PVA 0588 provides inferior yarn cohesion under high-tension shedding, and fully hydrolyzed PVA 1799 demands desizing temperatures above 95 °C and often requires hydrogen peroxide booster, increasing effluent COD load.

When Emulsion Polymerization Demands a Protective Colloid with Grafting Potential

As a primary stabilizer in vinyl acetate and vinyl acetate-ethylene emulsion polymerization, Sinopec PVA 080-22 participates in chain-transfer grafting reactions at the acetate side groups. The residual unsaturation and radical abstraction sites allow covalent attachment of the growing polymer chain to the PVA backbone, generating a graft copolymer at the particle-water interface that enhances shear stability under high-speed mixing conditions (> 10,000 s⁻¹ shear rate in a Silverson L5M rotor-stator). Emulsions stabilized with this grade exhibit coagulum levels below 0.1 % on a 100-mesh screen after 30 minutes of circulation through a gear pump, a performance metric that degrades by a factor of 3–5× when the same recipe substitutes a fully hydrolyzed PVA, which is less prone to grafting and forms a physically adsorbed layer susceptible to desorption under mechanical stress.

A formulation threshold worth noting: at PVA 080-22 concentrations exceeding 5 wt% based on monomer, the low-shear Brookfield viscosity of the final latex can surpass 15,000 mPa·s (spindle #6, 20 rpm), limiting solids content to approximately 50 % before reactor mixing becomes torque-limited. Compared to low-viscosity grades like PVA 0488 (4 % viscosity 4.0–5.5 mPa·s), 080-22 permits a higher molecular weight in the protective colloid shell, yielding improved wet-tack in pressure-sensitive adhesives but also a longer open time that may not suit high-speed lamination lines where set speed exceeds 100 m/min.

In paper surface sizing and pigment coating binders, the rheological signature of 080-22 at 12 % solids—a shear-thinning profile with flow behavior index n = 0.6–0.7 in the Ostwald-de Waele model over 10–1000 s⁻¹—enables metered size press application (rod pressure 150–250 kN/m on a Voith SpeedSizer) without excessive misting. Surface strength, as quantified by IGT pick resistance per ISO 3783:2006, improves by 30–50 % relative to starch-only formulations when PVA 080-22 replaces 25–50 % of the oxidized starch on a dry-weight basis. A documented limitation arises with calcium carbonate-filled papers at high filler loadings (> 20 % ash): the partially hydrolyzed PVA can adsorb preferentially onto the filler surface, depleting the free binder in the continuous phase and causing a drop in Scott bond internal strength. This effect is not observed to the same degree with fully hydrolyzed PVAs, which exhibit lower affinity for calcium carbonate due to their reduced hydrogen-bonding flexibility.

Operational Boundaries and Incompatibilities

Dry blending with strongly alkaline substances (sodium metasilicate, sodium carbonate decahydrate, or amines such as diethanolamine) must be avoided. Under alkaline conditions (pH > 9.5) at temperatures above 40 °C, the residual acetate groups undergo progressive saponification, releasing acetic acid salts and driving the PVA toward full hydrolysis in an uncontrolled manner. This manifests as a continuous rise in solution viscosity over 24–48 hours and eventual gelation if the saponification degree exceeds approximately 92 mol%, forming aggregated domains that block spinneret holes in wet-spinning operations. When formulation pH must be raised for cleaning or neutralization, buffer the solution to a stable range of 6.0–8.0 with a non-reactive acid such as phosphoric acid before PVA addition.

Storage in unlined carbon steel vessels for prolonged periods (> 30 days) can introduce ferric ion contamination that catalyzes thermo-oxidative degradation during film drying, evidenced by discoloration (yellowing) and a reduction in intrinsic viscosity of up to 15 %. Stainless steel (316L) or high-density polyethylene containers are recommended. Pre-drying the granular resin to below 0.3 % moisture (halogen moisture analyzer, 160 °C endpoint) becomes necessary when relative humidity during storage exceeds 60 %, otherwise bubble defects appear in cast films at thicknesses below 40 µm.

Comparative Specification Table: Sinopec PVA Grades
Parameter	PVA 080-22	PVA 1799	PVA 0588	Test Method
Hydrolysis degree (mol%)	88.0 ± 1.0	≥ 98.5	88.0 ± 1.0	ISO 15023-2:2019
Viscosity, 4% aq. (mPa·s, 20°C)	22.0–26.0	25.0–31.0	5.0–6.5	ISO 3105:1994
Ash content (%, as Na₂O)	≤ 0.5	≤ 0.7	≤ 0.5	ISO 3451-1:2019
Volatile matter (%)	≤ 5.0	≤ 5.0	≤ 5.0	ISO 1269:2006
pH (4% solution)	5.0–7.0	5.0–7.0	5.0–7.0	ISO 976:2013
Cold-water solubility	Complete at 20 °C	Insoluble below 80 °C	Complete at 20 °C	Internal visual test

A Regulatory and Compliance Snapshot

The grade meets the compositional requirements of the following frameworks, facilitating its integration into export-oriented manufacturing without re-registration burden in many regulatory areas:

FDA 21 CFR §176.170 — Components of paper and paperboard in contact with aqueous and fatty foods, subject to extractives limitations for repeat-use applications.
EU Regulation 10/2011 (Plastic Materials and Articles Intended to Come into Contact with Food) — Specific migration limit for vinyl acetate monomer is respected based on residual monomer levels consistently measured below 5 mg/kg via headspace GC-MS per EN 13130-5.
Reach (EC) No. 1907/2006 — Pre-registered as a polymer exempt from registration under Article 6(3), with full documentation of monomer and additive constituents.
RoHS Directive 2011/65/EU — Not within scope for electrical/electronic equipment but verified to contain < 0.1 % lead, mercury, hexavalent chromium, PBBs, and PBDEs.
EN 13432:2000 (Packaging — Requirements for packaging recoverable through composting and biodegradation) — PVA 080-22 has been demonstrated in independent studies to undergo > 60 % mineralization within 60 days in aerobic composting conditions, though certification for specific article formats requires end-product testing.

Critical Processing Parameters for Cast Film Manufacturing with PVA 080-22
Process Variable	Recommended Setting	Failure Mode When Exceeded
Solution preparation temperature	20–30 °C	Above 40 °C: premature gel skin formation
Drying zone 1 air temperature	65–70 °C	Above 80 °C: blistering, surface defects
Drying zone 2 air temperature	90–95 °C	Below 85 °C: residual moisture > 8 %
Extruder melt temperature (if melt processing)	185–195 °C	Above 200 °C: thermal degradation, yellowing
Film thickness range (cast)	30–80 µm	Below 25 µm: pinholing risk increases

Published data for the specific combination of this grade in reactive injection molding with aliphatic isocyanates is limited, and laboratory-scale trials have indicated rapid viscosity build-up incompatible with meter-mix dispensing equipment when NCO index exceeds 0.5. Laboratories pursuing such applications should conduct isothermal rheological monitoring at 60 °C for the first 10 minutes of reaction to establish a viable pot-life window. Thermal gravimetric analysis in nitrogen at 10 K/min shows onset of degradation at 240–250 °C, far below the processing temperatures of engineering thermoplastics; hence, its use as a masterbatch carrier resin is confined to polyolefins processed under 230 °C to avoid discoloration and volatile emission.

HS Code	788687
Product Name	Sinopec PVA 080-22
Chemical Name	Polyvinyl alcohol, partially hydrolyzed
Cas Number	9002-89-5
Appearance	White or off-white powder
Average Degree Of Polymerization	800
Degree Of Hydrolysis	22 ± 2 mol%
Viscosity 4 Solution 20c	8.0 mPa·s
Ph 10 Aqueous Solution	6.0-8.0
Ash Content	≤0.5%
Volatile Content	≤5.0%
Bulk Density	0.4-0.6 g/cm³
Particle Size	80 mesh

Packing	Sinopec PVA 080-22 is supplied in 25 kg net multi-walled paper bags with inner polyethylene liner, palletized and wrapped.
Container Loading (20′ FCL)	20′ FCL: one full 20-foot container of Sinopec PVA 080-22, polyvinyl alcohol, loaded on pallets and secured for safe transport.
Shipping	Sinopec PVA 080-22 ships as a white granular powder in sealed multi-layer paper or kraft bags, typically palletized and container-lined. Keep dry, away from moisture and direct heat during transit. Material is non-hazardous, but handle with care to prevent dust generation and bag damage.
Storage	Store Sinopec PVA 080-22 in a cool, dry, well-ventilated area, away from direct sunlight, heat sources, and ignition sources. Keep containers tightly sealed to prevent moisture absorption and dust generation. Avoid contact with strong oxidizers. Maintain moderate humidity and room temperature. Use proper labeling and ensure good housekeeping to prevent dust accumulation and static discharge.
Shelf Life	Store in a cool, dry place with sealed packaging. Shelf life is typically 12 months from date of manufacture.

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