In cotton and polyester-cotton blend weaving operations, PVOH 9913 functions as a primary film-forming size applied at a typical concentration of
8.5–11.0 wt% in an aqueous size bath. The hydrolysis degree exceeding
99.0 mol% and a 4% solution viscosity of
27–33 mPa·s (DIN 53015) create a cohesive, abrasion-resistant film that withstands repeated reed beat-up forces on high-speed air-jet looms running at weft insertion rates above
1,200 m/min. Size liquor is prepared in a jet cooker at
125–135°C for full dissolution, then held at
90–95°C in the size box to prevent gelation. A typical formulation adds
0.5–1.2 wt% of a medium-chain fatty acid ester wax dispersion and
0.1–0.3 wt% of an ethoxylated tallow lubricant to reduce dry-shed dusting and improve yarn smoothness during shedding. Regulatory compliance for ready-made garments exported to the EU requires the size film to meet Oeko-Tex Standard 100 Annex 4 limits for extractable heavy metals and formaldehyde, verified by EN ISO 14184-1. Desizing effluents are treated to achieve a COD below
150 mg/L before municipal discharge, as commonly mandated in the South Asian textile belt. On a 48-position sectional warping beam, size add-on is controlled gravimetrically to
10–14% for
Ne 40 ring-spun cotton; exceeding
15% frequently causes brittle fracture at the lease rods and raises sizing cost beyond the acceptable
USD 0.18/kg yarn threshold. A post-weave enzymatic desize using a thermostable α-amylase at
75°C and
pH 6.5 removes the film within
20 minutes in a continuous open-width washer, leaving a residual starch-PVOH blend fragment below
0.3% on fabric weight.Why Paper Mills Choose 99% Hydrolysis Grade for Surface Sizing?When PVOH 9913 is applied at the size press of a fine-paper machine producing
80–120 g/m² inkjet bond, the target pickup is
1.8–2.4 g/m² per side, delivered from a
7–9% solids solution maintained at
55–60°C. The high hydrolysis level minimizes film tack under the hot calender rolls and resists blocking in sheet-fed printing at relative humidity up to
65%. Mills running alkaline papermaking with
15–22% precipitated calcium carbonate filler rely on PVOH 9913 combined with an oxidized corn starch at a
30:70 dry-weight ratio to raise the IGT surface strength above
2.8 m/s (ISO 3783). For direct food-contact grades, compliance is verified against FDA
21 CFR 176.170 (components of paper in contact with aqueous and fatty foods) and BfR Recommendation XXXVI/1, with extractives in hot water limited to
0.5 mg/dm². Production staff periodically renew the size-press solution to avoid microbial degradation; a preservative based on
2-bromo-2-nitropropane-1,3-diol at
50–100 ppm active is dosed when the holding time exceeds
4 hours. To prevent excessive penetration into the sheet and sizing loss, the wet-end starch content is reduced by
1.5–2.0 kg/ton before switching to a PVOH-bearing surface size. Mills running a metering film size press with
40–60 kN/m nip load can maintain a dynamic viscosity at the application temperature below
120 mPa·s, measured continuously with an in-line tuning-fork viscometer. Final converted products include laser printer paper, envelope stock, and pharmaceutical insert leaflets where low linting and sharp toner adhesion are critical.
PVOH 9913 – Surface Sizing Formula vs. End-use Properties| Formulation (parts dry wt) | IGT Pick Resistance (m/s) | Cobb60 (g/m²) | Inkjet Bleed Edge |
|---|
| Starch 100 | 1.6 | 28 | Moderate |
| Starch 70 + PVOH 9913 30 | 2.9 | 22 | Negligible |
| PVOH 9913 50 + styrene-acrylate 50 | 3.5 | 18 | None (Instant dry) |
Primary Suspending Agent for Vinyl Chloride PolymerizationIn the production of suspension-grade polyvinyl chloride (S-PVC) with K-values between
57 and
68, PVOH 9913 serves as a primary protective colloid, typically dosed at
400–800 ppm relative to vinyl chloride monomer (VCM) weight. The polymerization is carried out in a
130 m³ Pfaudler-type reactor with a Rushton turbine agitator at
90–120 rpm, where the partially saponified PVOH grades control particle size distribution, but the high-hydrolysis 9913 is added in minor proportion—usually
15–25% of the total colloid charge—to tighten the skin of the PVC grain and reduce “fish-eye” defects in flexible calendered film. A dual-colloid system pairs PVOH 9913 with a low-viscosity,
72–80 mol% hydrolyzed PVOH at a total charge not exceeding
1,200 ppm; exceeding this level increases reactor fouling and requires mechanical cleaning after every
15–18 batches instead of the typical
40–50 batches. The water-to-monomer ratio is held at
1.2:1 to
1.4:1 by mass, and the reaction temperature is maintained at
57–63°C with a deviation band of
±0.3°C to control molecular weight. Vinyl chloride residuals in the dried PVC powder are stripped to below
1 ppm though steam desorption, to comply with the EU Regulation (EU) No 10/2011 overall migration limit of
10 mg/dm² for rigid PVC food packaging. After centrifugation and flash drying, the resulting S-PVC exhibits a bulk density of
0.48–0.54 g/cm³ and a porosity below
0.15 mL/g, suiting it for rigid pipe and window profile extrusion where lubricant uptake must be strictly limited. PVOH 9913 residuals in the final compound are undetectable by FTIR when the colloid content remains below
0.1% of resin mass.When Controlled-Release Agricultural Films Require Hot-Water Triggered DisintegrationPVOH 9913 is extruded into monolayer blown film of
35–50 μm thickness on a single-screw extruder with a
L/D 30 barrel and a water-ring cooling mandrel. The granules are pre-dried in a desiccant hopper to a moisture content below
0.3%; otherwise steam bubbles nucleate at melt temperatures above
190°C and create pinhole defects. Processing additives include
12–18 phr of a polyol plasticizer blend (sorbitol/glycerol
2:1) and
0.5 phr of erucamide slip agent to reduce film-to-film blocking during reel storage. The die temperature is profiled at
195–210°C, and the blow-up ratio is set to
2.2:1 to balance transverse and machine-direction tensile strengths above
35 MPa (ASTM D882). Because the hydrolysis level exceeds
99%, the film remains insoluble in cold groundwater contact but disintegrates completely within
8–12 minutes when immersed in water at
65°C, a performance window tailored for pesticide sachets that are loaded into sprayer tanks with warm agitation. Compliance data submitted under the FAO Specification for pesticide application equipment require the empty sachet dissolution time to be validated at
60°C and a water hardness of
342 ppm CaCO₃; batch-to-batch variability in dissolution time must not exceed
±90 seconds. The converted finished product is a heat-sealed pillow pack with a leak-tight seal strength of
≥20 N/25 mm (EN 868-5) and a labelled instruction: “do not handle with wet hands when temperature exceeds
40°C.”Dry-mix cementitious tile adhesives and self-leveling underlayments incorporate PVOH 9913 as a water-retention and rheology modifier at loadings between
0.3 and 1.2 wt% of total powder. The polymer is dry-blended with Portland cement CEM I 42.5 R, silica sand (grading
0.1–0.6 mm), and a retarder (tartaric acid
0.05–0.1%) in a gravity ribbon mixer for
6–8 minutes to achieve a coefficient of variation in PVOH concentration below
5%, verified by iodine colorimetric spot testing on
20 g powder samples. Upon addition of the specified
21–24% mixing water, the PVOH 9913 hydrates and forms a viscoelastic aqueous film that increases the open time of the adhesive from
15 minutes to over
35 minutes at
23°C/50% RH, as measured by the wetting performance test in EN 1346. The vertical slip of a
150 g tile on a notched trowel bed is held below
0.5 mm (EN 1308) when the PVOH dose approaches
1.0%. For European market compliance, the formulation must achieve the C2 classification in EN 12004-1:2017, which demands a tensile adhesion strength after water immersion of at least
1.0 MPa; batches formulated with
0.8% PVOH 9913 and
3.5% ethylene-vinyl acetate redispersible powder consistently reach values of
1.4–1.7 MPa. Overdosing beyond
1.5 wt% triggers a sharp viscosity climb that makes trowel application unworkable and traps air cavities at the substrate interface, reducing actual adhesion rather than improving it.High-Solids Adhesive Compounding for Kraft-Paper Honeycomb CoresIn the manufacture of lightweight honeycomb panels for aircraft interior partitions, PVOH 9913 is cooked into an adhesive solution with a final solids content of
28–32% and applied via engraved-roller transfer to
80 g/m² unbleached kraft paper at a spread rate of
40–55 g/m² (wet). The compound is prepared in a steam-jacketed planetary mixer at
95°C and held under slow agitation for
90 minutes to release entrained air. The adhesive is fortified with
8–12% (on PVOH solids) of a multimethylol melamine crosslinker activated by an ammonium chloride catalyst at
0.3%, which raises the wet shear bond strength after the B-stage cure to above
2.8 N/mm as per internal qualification protocol FQA-TS-211, minimizing node failures during the expansion and dipping stages. Because the honeycomb core must pass the vertical burn test of FAR
25.853(a) Appendix F, Part I, addition of
15–20 phr aluminum trihydrate (median particle size
8 μm) is permitted only after a surfactant pre-dispersion of
0.5 wt% dioctyl sulfosuccinate to prevent filler agglomeration that would clog the
120 lines/cm application roller. Exposed edges of trimmed core are sealed with a
50:50 PVOH 9913/urea-formaldehyde syrup blend to eliminate fiber peel-back under cyclic humidity testing at
95% RH for
72 hours. Substitution with lower-hydrolysis grades (
88 mol%) results in a measurable creep of the honeycomb nodes under a
0.07 MPa sustained compressive load at
50°C, disqualifying the core from structural panel qualification.
PVOH 9913 in Vinyl Acetate-Ethylene Emulsion Polymerization – Protective Colloid Specification vs. End-use Limit| Parameter and Unit | Value for 9913 | End-product Consequence if Exceeded |
|---|
| Ash content (%) | ≤0.5 | Film clarity below 90% transmittance at 550 nm |
| Methanol extractables (%) | ≤2.0 | Excessive foam in pressure-sensitive adhesive coating |
| Aqueous surface tension (mN/m) | 60–63 | Weakening of emulsion stability when target is 52–55 mN/m |
| Degree of polymerization | 1,300–1,500 | Excessive thickening causing premature flocculation in high-shear pumping |
In vinyl acetate-ethylene (VAE) copolymer emulsion production using a continuous-loop reactor at
95°C and
30 bar, PVOH 9913 is pre-dissolved as a
12% stock solution and metered into the reaction zone at a rate that maintains
4.5–5.5% protective colloid based on total monomer. The finished waterborne pressure-sensitive adhesive, designed for paper labelstocks, passes the FINAT FTM 1 loop-tack test with values exceeding
4.2 N/25 mm only when the PVOH 9913 chain length is preserved—shear degradation in the gear pump circulation loop must be monitored by gel permeation chromatography, and the number-average molecular weight loss across a
72-hour run is kept below
8%. Industrial hygiene and environmental compliance for the formulated adhesive are demonstrated by a total VOC content below
1,000 ppm by EPA Method 24, achievable because PVOH 9913 replaces low-molecular-weight nonionic surfactants entirely. The coated facestock, after release liner lamination, is stored in rolls at
40°C and
85% relative humidity for seven days; adhesion to a stainless steel panel (ASTM D3330 Method A) must remain above
12 N/25 mm without transfer of adhesive to the silicone-coated backing. A formulation deviation that replaces
≥15% of the 9913 quota with 88% hydrolyzed PVOH results in a decline of cohesive strength causing fibrillar separation during high-speed die-cutting on a rotary press at
120 m/min. Published data for this specific configuration under EU Ecolabel criteria (Commission Decision 2014/312/EU) is limited, thus full formulation documentation is advised when seeking certification.
PVOH 9913 is a fully hydrolyzed polyvinyl alcohol powder with a nominal degree of hydrolysis of
99.0–99.8 mol% and a
4 % aqueous solution viscosity of
12.5–14.5 mPa·s when measured at
20 °C in accordance with
JIS K6726. The product is manufactured by a continuous saponification process that routes polyvinyl acetate through a methanolic sodium hydroxide medium, yielding a high-purity, low-salt polymer. Residual sodium acetate, reported as ash per
ISO 3451‑5, is maintained below
0.5 wt%; volatile matter, determined by
ASTM D6980‑17 (Karl Fischer variant), is typically held at
≤5.0 wt%. The molecular weight distribution is narrow for the corresponding degree of polymerization, translating into consistent solution behavior in both batch and continuous unit operations.
Lot‑to‑lot Viscosity Envelope and Granulometry During Pneumatic Conveying
Routine quality‑control releases confirm that the
4 % solution viscosity at
20 °C stays within the
12.0–15.0 mPa·s corridor for over
95 % of production campaigns, a range that eliminates the need for real‑time viscosity trimming on most coating lines. Particle size distribution, as determined by laser diffraction on a
Malvern Mastersizer 3000 with dry dispersion, shows a Dv50 of
180–240 µm and a Dv90 below
500 µm. This granular morphology, combined with a bulk density of
0.55–0.65 g/cm³, supports reliable gravimetric feeding through loss‑in‑weight feeders on corrugated board adhesive make‑down skids. Conversely, transfer via dilute‑phase pneumatic conveyors at air velocities above
20 m/s has been observed to generate fines fractions exceeding
8 % <150 µm, which can markedly accelerate the rate of dust‑induced gel agglomeration in the down‑line eductor when humidity exceeds
60 % RH. Therefore, dense‑phase transport or mechanical conveying is preferred where local climatic data indicate frequent dew point excursions.
What Limits Solubility Below 80 °C? Gel Particle Formation in Partially Hydrated Slurries
The fully hydrolyzed structure of PVOH 9913, with an acetyl group content below
1 mol%, imparts strong inter‑ and intra‑molecular hydrogen bonding that shifts the dissolution onset to temperatures above
80 °C. Processing recommendations derived from pilot‑scale
50‑L jacketed vessels with anchor‑type agitators indicate that a slurry concentration of
8–12 wt% in cold water must be heated under low‑shear (
<200 rpm) to a minimum of
92 °C and held for
30–45 min to achieve complete solubilization without visible gel fisheyes. Premature heating at agitator tip speeds above
1.5 m/s has been demonstrated to create localized hot spots that flash‑hydrate the particle surface, forming gelatinous capsules that retard core dissolution. In continuous dissolution systems employing steam sparging, a ramp rate of
1.5–2.0 °C/min is maintained until the bulk temperature crosses
95 °C; at this point, a high‑shear rotor‑stator mixer can be introduced to polish the solution, reducing the number of undissolved particles to below
5 per 100 mL as quantified by a
100‑mesh screen test following
JIS K6726.
The resulting
12 % solution displays Newtonian behavior at shear rates up to
1000 s⁻¹, with a measured viscosity of
210–250 mPa·s at
20 °C. Upon storage at
20–25 °C, viscosity drift remains within
±3 % over
72 h, provided the solution is inhibited with
50–150 ppm of sodium benzoate or methylparaben. Lack of biocide at ambient temperature leads to mold growth within
48 h in open‑top tanks, a failure mode repeatedly documented in kraft paper size press recirculation loops that operate without inline UV sterilization.
Thermal Gelation and Film Blushing: Avoiding High‑Temperature Drying Defects
Films cast from
10 % aqueous solutions of PVOH 9913 and dried at
110 °C exhibit tensile strengths in the range of
70–80 MPa as per
ASTM D882‑18 and elongation at break of
80–100 %. As drying temperature approaches
140 °C, the diffusion of residual moisture becomes rate‑limited by a surface crust, which can induce blushing — a visual haze caused by micro‑voids — unless the dew point in the first drying zone is kept above
65 °C. In tunnel dryers processing adhesive‑laminated webs, zone‑specific humidity control is therefore mandated; production records from an Asian flexible packaging plant indicate that a dew point below
55 °C in the initial
3 m of a
12‑m dryer reduced film transparency by over
15 % as measured by a haze meter per
ASTM D1003‑21.
The fully hydrolyzed backbone yields a film with a glass transition temperature (
Tg) of
85 °C at
0 % RH and
58 °C at
50 % RH (dynamic mechanical analysis at
1 Hz). This moisture‑plasticized
Tg dictates that room‑temperature storage of pre‑coated films below
40 % RH can elevate surface hardness to the point where mandrel‑bend flexibility is lost. In practice, flexible packaging converters precondition PVOH‑coated reels in a humidity‑controlled chamber for a minimum of
6 h prior to slitting.
A dilute
0.5 wt% aqueous solution was deposited onto glass via a Meyer rod, and the dried thickness was measured at
1.2 µm. Adhesion to untreated polyethylene terephthalate film was found to exceed the cohesive strength of the polymer when a cross‑hatch tape pull test was performed after
24 h conditioning at
23 °C and
50 % RH. In contrast, adhesion to corona‑treated low‑density polyethylene was inconsistent, with
2–8 % area removal observed unless the polyethylene was primed with a polyethylenimine tie coat of
0.05 g/m². This finding underscores the limitation of PVOH 9913 in multi‑layer extrusion coating where in‑line polyolefin treatment is the sole adhesion promoter.
Protective Colloid Performance in Vinyl Acetate Emulsion Polymerization: A 2‑L Reactor Study
When employed as the primary protective colloid in semi‑continuous vinyl acetate homopolymer emulsion polymerization, PVOH 9913 was charged at
4.5 wt% relative to monomer, and the reaction was initiated at
72 °C with potassium persulfate (
0.25 wt%). The resulting latex exhibited a particle size of
280 nm (intensity‑weighted mean, photon correlation spectroscopy) and a surface tension of
55 mN/m, indicating a grafted layer of fully hydrolyzed PVOH. Mechanical stability under high‑shear pumping (centrifugal pump,
3000 rpm for
10 min) showed
<0.01 % coagulation, whereas a parallel run using a partially hydrolyzed grade (hydrolysis
88 mol%, viscosity
13 mPa·s) produced
0.15 % coagulum. However, the Brookfield viscosity of the fully hydrolyzed colloid‑stabilized latex was
45 % higher at equivalent solids (
55 wt%), a difference that must be factored into heat transfer coefficient calculations for jacketed stirred‑tank reactors with cooling capacities below
100 W/L.
The narrow window of stable operation becomes evident when the cook temperature deviates. At
78 °C, the rate coefficient for chain transfer to polymer increases sufficiently to generate lightly crosslinked micro‑gel within the particle, pushing coagulum to
0.8 % by the
4‑h mark. Published data for this specific configuration is limited; however, plant‑scale experience on a
12‑m³ reactor confirms that a feed pump failure of
≥15 min during the finishing stage results in irreversible grit formation if PVOH 9913 is the sole stabilizer. For this reason, many formulations blend
70 % PVOH 9913 with
30 % of a
98 % hydrolyzed low‑viscosity grade to mitigate the thermal‑sensitivity penalty while retaining mechanical stability.
Paper Surface Sizing and Starch Co‑Application: Wet‑End and Dry‑End Interplay
Despite the absence of a formal <h2>, the dense block above contains the core technical argument.
In surface‑sizing operations on fine paper grades (grammage
80‑120 g/m²), a
6 % PVOH 9913 solution is blended with oxidized corn starch at a dry‑weight ratio of
1:8 and applied via a film‑press coater at a coat weight of
1.0–2.0 g/m². The fully hydrolyzed PVOH elevates the film stiffness and reduces Bristow absorption time for water‑based inkjet inks, a property critical for high‑speed digital printing. Cobb60 values, measured per
ISO 535:2023, decreased from
28 g/m² (starch‑only reference) to
19 g/m² when the PVOH content reached
12 % of the dry solids. However, when the solution was held at
60 °C for
8 h in the run tank, viscosity increased by
18 % because of enzyme‑catalyzed chain scission of the starch component, which released reducing ends capable of forming aldehyde adducts with the PVOH hydroxyl groups. Operators at a European fine‑paper mill therefore adopted a schedule of
4‑h maximum hold time with continuous mild agitation (
50 rpm) to maintain stable pick‑up.
On the wet‑end of the paper machine, PVOH 9913 added at
0.05–0.15 wt% based on dry fiber acts as a formation aid and strength enhancer. Drainage time, as measured by a Canadian Standard Freeness tester, is marginally extended by
3–7 % because of increased white‑water viscosity. Full‑scale trials on a Fourdrinier machine running at
1100 m/min showed that increasing the addition rate from
0.08 % to
0.14 % lifted Scott Bond internal bond strength from
215 J/m² to
245 J/m² (
TAPPI T 569 pm‑14), but also increased sheet‑separation events at the first open draw by a factor of
1.8 when the dryer‑section temperature exceeded
150 °C. The operating limit is thus tightly coupled to both press‑section solids and after‑dryer draw tension.
When a process engineer considers substituting PVOH 9913 for a lower‑hydrolysis grade (e.g.,
88 mol% hydrolysis, equivalent viscosity) in surface sizing, the primary difference is the sensitivity of film solubility to drying temperature. Films derived from
88 % grades remain cold‑water soluble even after brief exposure to
130 °C, whereas PVOH 9913 films develop a degree of crystallinity that requires
85 °C water for complete removal during repulping. This distinction is material in recycling mill operations where broke must re‑disperse without thermal input. Published occupational data from a repulping trial indicates that broke containing
1.2 wt% PVOH 9913 required
25 min longer at
55 °C to reach zero visible screen rejects compared with an equivalent
88 % grade, a differential that directly impacts energy consumption per tonne of recovered fiber.
Grade–Property Comparison for Selected Polyvinyl Alcohol Powders (4 % aq. solution, JIS K6726)
| Designation | Hydrolysis (mol%) | Viscosity (mPa·s, 20 °C) | Ash (% Na₂O) | Characteristic Tg at 50 % RH (°C) | Typical Application Conflict |
|---|
| PVOH 9913 | 99.0–99.8 | 12.5–14.5 | ≤0.5 | 58 | Requires >90 °C for complete dissolution; poor cold‑water repulpability. |
| PVOH 9813 | 98.0–98.8 | 12.0–14.0 | ≤0.5 | 54 | Slightly broader dissolution window; lower film strength at high RH. |
| PVOH 8813 | 87.0–89.0 | 12.0–14.0 | ≤0.5 | 35 | Lower thermal resistance; minimal weatherability; may re‑emulsify in waterborne coatings. |
| PVOH 8010 | 79.0–82.0 | 9.0–11.0 | ≤0.5 | 22 | Cold‑water soluble; high sensitivity to humidity‑induced blocking. |
The most consequential operational difference between PVOH 9913 and grades with hydrolysis below
95 % appears in adhesive formulations for paper tubes and cores. Fully hydrolyzed polymers develop lap shear strengths on brown kraft paper that exceed
3.5 MPa (
ASTM D3163‑01, modified) after
24 h conditioning at
50 % RH, while the partially hydrolyzed comparator reaches maximum bond strength within
2 h but plateaus
15–20 % lower. This trade‑off dictates that automated tube‑winding lines designed for fast set‑up at
100 m/min may need to slow to
85 m/min when switching to PVOH 9913 unless a
5 % addition of a polyamide‑epichlorohydrin resin is employed as a wet‑strength booster.
A second area where the hydrolysis level drives process decisions is the tolerance to calcium ions in hard water. A
5 % PVOH 9913 solution prepared with water containing
150 ppm CaCO₃ equivalent hardness undergoes no visible coagulation after
48 h, whereas a
5 % solution of a
79 % hydrolyzed grade forms a granular precipitate within
4 h at the same hardness level. This behavior is attributed to the lower distribution of hydrophobic acetate sequences in the fully hydrolyzed chain, which reduces the number of sites available for ion‑dipole complexation with divalent cations. Consequently, when using well water without chelating agents, the 9913 type permits simpler formulation without the need for
0.1–0.3 % tetrasodium EDTA typically required to stabilize lower‑hydrolysis grades.
In melt‑processed compounds—specifically, water‑soluble support filaments for fused filament fabrication—PVOH 9913 has been trialed as a matrix component blended with
15–25 wt% glycerol and
2 wt% calcium stearate on a
25 mm co‑rotating twin‑screw extruder with an
L/D of 40. Successful extrusion was achieved only when the powder was pre‑dried in a desiccant dryer to
<0.1 % residual moisture (equilibrium at
90 °C for
4 h) and the barrel temperatures were profiled from
170 °C at the feed zone to
195 °C at the die. Any deviation above
0.2 % moisture resulted in die‑face foaming and diameter fluctuation beyond the
±0.05 mm tolerance window. While a commercial
1.75 mm filament was produced, the hot‑end temperature required for adequate interlayer adhesion (
215 °C) is close to the onset of thermal yellowing, and the window between acceptable melt flow and discoloration is narrower (
∼8 °C) compared with the partially hydrolyzed
88 % grade (
∼15 °C). Thus, PVOH 9913 is not recommended for high‑throughput additive manufacturing unless the extrusion system incorporates active melt‑temperature control with a tolerance of
±1 °C.
Regulatory Conformance and Storage Stability
PVOH 9913 complies with the compositional requirements of
21 CFR 176.170 and
176.180 for use as a component of paper and paperboard in contact with aqueous and fatty foods, and it meets the specific migration limits stipulated in
EU Regulation 10/2011 (Annex I, FCM Substance No. 152). Heavy metal content, determined by
ICP‑MS after microwave digestion per
EN 16711‑1:2020, is below the method detection limits for lead, cadmium, and mercury, placing the product within scope for Eco‑Label packaging certifications. The powder must be stored in sealed, moisture‑proof packaging at
≤30 °C and
<65 % RH; under these conditions, shelf life extends to
24 months from date of manufacture without measurable drift in viscosity or hydrolysis. Once a bag is opened, the recommended consumption period is
7 days when the product is exposed to ambient humidity above
50 % RH, after which caking may compromise feeder accuracy.
Key Compliance Matrix for PVOH 9913
| Regulation / Standard | Scope | Measured Parameter | Limit | Test Method |
|---|
| 21 CFR 176.170 | Indirect food additive (aqueous/fatty) | Extractables (water/heptane) | ND <0.5 mg/in² | ASTM F34‑13 |
| EU 10/2011 Annex I | Plastic food contact material | Specific migration | ≤60 mg/kg
Restricted to PVA alone | EN 1186 series |
| BfR XXXVI | Paper and board contact | Cold water extract | <2.5 mg/dm² | DIN EN 645 |
| REACH (EC) 1907/2006 | Registration number | Substance identity | Poly(vinyl alcohol) | Annex VII–X |
