| HS Code | 641069 |
| Product Name | Mowital B 30 H |
| Chemical Type | Polyvinyl butyral (PVB) |
| Cas Number | 63148-65-2 |
| Appearance | White to slightly yellowish free-flowing powder |
| Viscosity | Approx. 30 mPa·s (10% w/w solution in ethanol at 20°C) |
| Molecular Weight | Approx. 50,000 g/mol |
| Density | Approx. 1.08 g/cm³ at 20°C |
| Glass Transition Temperature | Approx. 65°C |
| Hydroxyl Group Content | Approx. 27 wt% |
| Butyral Group Content | Approx. 70 wt% |
| Acetyl Group Content | Approx. 2 wt% |
As an accredited Mowital B 30 H factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Mowital B 30 H is supplied in 25 kg polyethylene-lined paper bags, palletized and shrink-wrapped for safe storage and transport. |
| Container Loading (20′ FCL) | 20′ FCL: Mowital B 30 H loaded in 25 kg bags on pallets, stowed securely in a full 20-foot container for safe transport. |
| Shipping | Mowital B 30 H is a polyvinyl butyral resin supplied as a free-flowing powder. Ship in sealed, moisture-proof containers, protected from humidity, heat, and direct sunlight. Keep dry during transport and storage. Avoid dust accumulation and ignition sources. No special hazard classification for general freight under normal conditions. |
| Storage | Store Mowital B 30 H in its original, tightly sealed container in a cool, dry, well-ventilated area. Protect from moisture, direct sunlight, and excessive heat. Keep away from ignition sources and incompatible materials. Avoid dust accumulation. Under proper conditions, shelf life is typically several years. |
| Shelf Life | Shelf life is typically 2 years from production date when stored sealed in original container, in a dry, cool place. |
Mowital B 30 H is a low-viscosity polyvinyl butyral resin whose polyvinyl alcohol content is specified in the 18–21 wt% range and whose solubility in ethanol, ethyl acetate, MEK, and glycol ethers permits high-solids formulation for industrial coating, ink, and ceramic binder processes. The grade is differentiated from higher-molecular-weight PVB grades by lower solution viscosity and more rapid solvent release under forced-air drying, while the same hydroxyl functionality remains available for reaction with acid activators, polyisocyanates, phenolics, and melamine crosslinkers. The following application scenarios are restricted to downstream manufacturing sectors in which Mowital B 30 H is an established production-specified binder or co-binder; they exclude unrelated sectors and do not imply suitability beyond validated formulation limits.
| Application | Standard | Test or clause | Control objective |
|---|---|---|---|
| Acid-activated wash primer | ISO 12944-5:2019, ISO 2409:2020, ASTM D3359-17 | Cross-cut classification; tape pull | Adhesion and corrosion protection under industrial atmospheric conditions |
| Flexographic/gravure lamination ink | EU Regulation 10/2011, FDA 21 CFR 175.105, Swiss Ordinance SR 817.023.21 | Migration and sensory limits | Food-contact packaging safety |
| LTCC ceramic green tape | AEC-Q200 | Passive component stress test | Sintered substrate reliability |
| Heat-seal lidding lacquer | EU Regulation 10/2011, FDA 21 CFR 175.300, USP 671 | Permeation and extractives testing | Barrier integrity and pharmaceutical moisture protection |
| Flexible packaging laminating adhesive | FDA 21 CFR 175.105, EU Regulation 10/2011 | Migration testing | Multilayer plastic food-contact compliance |
| Temporary protective coating | RoHS Directive 2011/65/EU, ISO 2409:2020, ASTM D3359-17 | Restricted substance and adhesion classification | Transit protection without residue or contaminant release |
Cold-rolled steel and hot-dip galvanized steel entering structural fabrication shops are frequently prepared with two-pack acid-activated polyvinyl butyral wash primers before storage or topcoating. Mowital B 30 H is dissolved in anhydrous ethanol or isopropanol with a ketone co-solvent and milled with zinc phosphate, precipitated silica, and carbon black or titanium dioxide in a Cowles high-shear disperser at a tip speed of 18–24 m/s; the disperser vessel is jacketed to keep the batch below 40 °C to avoid solvent loss and acid-induced precipitation. The base component typically contains 8–12 wt% Mowital B 30 H before the activator is added, and the separate activator solution contains 7–10 wt% phosphoric acid in isopropanol/water and is combined at the spray gun or in a mixing pot immediately before use. After a 1:1 volume mix with activator, the applied film contains PVB as the dominant film former. Application is by conventional spray, airless spray, or brush; wet-film thickness is controlled at 15–25 µm, yielding a dry film of 5–10 µm. Pot life after activator addition is normally limited to 6–8 h at 23 °C; gelation or viscosity rise outside this window indicates premature reaction between phosphoric acid and the PVB hydroxyl fraction. Because wash primers are deliberately thin, wet-film thickness above 25 µm can entrap solvent and create intercoat delamination under full-build epoxy or polyurethane topcoats. The relevant corrosion protection framework is ISO 12944-5:2019, with adhesion assessed by ISO 2409:2020 cross-cut classification or ASTM D3359-17 tape pull; regional VOC requirements may constrain solvent selection but do not alter the PVB addition window. Terminal finished product types include single-pack shop primers for structural steel, two-pack etch primers for galvanized ductwork, aluminium repair primers, and pre-treatment primers under epoxy and polyurethane topcoats.
In solvent-based flexographic and gravure printing on oriented polypropylene, polyethylene, and metallized polyester, Mowital B 30 H is introduced as a letdown resin that raises adhesion to corona- or plasma-treated films without increasing retort-induced delamination. The resin cut is prepared at 25–35 wt% solids in n-propanol/ethyl acetate or ethanol/ethyl acetate, then milled with pigment, dispersant, and nitrocellulose or polyurethane co-binder in a bead mill to a final grind of 5–10 µm on a Hegman gauge. Mowital B 30 H is typically added at 6–12 wt% of total ink varnish solids, corresponding to 2–6 wt% of the finished ink, because higher PVB loadings raise viscosity above the 18–25 s Zahn cup #2 window at 25 °C and can promote plate swelling on photopolymer flexo plates. After letdown, the ink is adjusted to 18–25 s Zahn cup #2 and printed at 80–150 m/min; drying ovens are maintained at 50–70 °C, with residual solvent below 5 mg/m² before rewind. On central-impression flexo presses, anilox line screens between 300 lpi and 500 lpi are used, and chamber doctor-blade temperature is kept below 35 °C to prevent solvent flashing and ink viscosity drift at speed. Compliance for food-contact packaging is established under EU Regulation 10/2011 and FDA 21 CFR 175.105 where applicable; printing ink formulations may also be evaluated under Swiss Ordinance SR 817.023.21 for sensory and migration limits, and print process safety is covered by ISO 12643-1 where national regulation applies. End-use printed structures include snack food wrappers, retortable pouches, lamination inks for boil-in-bag packaging, and surface-print film labels.
No unified ISO standard governs every PVB-bound low-temperature co-fired ceramic green tape formulation; qualification is normally derived from downstream AEC-Q200 passive component stress tests and customer-specific build control for density, thickness, and burnout residue. Mowital B 30 H is dispersed into an alumina or glass-ceramic slurry at 4–8 wt% based on ceramic solids, with the PVB first cut in ethanol/toluene or MEK/ethanol and plasticized with a phthalate or citrate plasticizer at 10–25 phr on PVB solids. The slurry is milled in a ball mill or attrition mill to a fineness suitable for tape casting, de-aired under vacuum below 50 mbar, and cast onto silicone-coated PET through a doctor blade gap of 100–300 µm. Drying is conducted in zone-controlled ovens at 60–90 °C to avoid skin-over and trapped solvent, producing green tape with thickness between 50 µm and 150 µm. Binder burnout is the critical process boundary: the tape must dwell at 350–450 °C in air for 2–4 h before sintering, because incomplete PVB elimination leaves carbonaceous residue that lowers sintered density and changes dielectric loss. Milling viscosity before de-air is maintained between 2,000 mPa·s and 5,000 mPa·s at 25 °C; below this range heavy ceramic solids settle, and above this range air release slows and pinholes persist in the dried tape. The green tape is cut, via-punched, screen-printed with conductor paste, laminated, and co-fired as multilayer substrates, chip inductors, or ceramic RF modules. Terminal finished product types include LTCC substrates for automotive and industrial electronics, alumina multilayer packages, and ceramic heater substrates.
Lidding foil for pharmaceutical and dairy blister packaging carries a heat-seal lacquer that must adhere to the foil surface, resist blocking in roll form, and seal against PVC/PVDC or PET-G blister trays. Mowital B 30 H is dissolved at 10–18 wt% in MEK/ethyl acetate/isopropanol with a co-binder such as rosin ester or styrene-maleic resin, and the lacquer is applied by gravure cylinder at a coat weight between 1.5 g/m² and 4.0 g/m² dry. Drying is carried out at 80–120 °C for 5–15 s, with residual solvent below 3 mg/m² to prevent blocking on rewind. Sealing is performed on rotary or reciprocating blister machines at jaw temperatures of 150–190 °C, dwell 0.2–0.5 s, and pressure 0.3–0.6 MPa; peel strength typically falls in the range of 4–10 N/15 mm depending on tray gauge and seal geometry. A lacquer with insufficient PVB loading fails adhesion on the foil, while excessive PVB loading raises seal initiation temperature and causes stringing during hot-tack peeling; the formulation window is therefore validated by differential scanning calorimetry and shear-seal tensile testing rather than by solids content alone. Food-contact and pharmaceutical barrier compliance is assessed under EU Regulation 10/2011 for plastic layers, FDA 21 CFR 175.300 for resinous coatings, and USP 671 for moisture permeation when the complete blister is qualified. Terminal finished product types include push-through pharmaceutical lidding foil, peelable dairy lidding, single-dose oral solid dose blister packs, and aluminium seal membranes for bottles.
In flexible packaging lamination, Mowital B 30 H is employed as a hydroxyl-bearing co-binder in solvent-borne two-component polyurethane laminating adhesives for foil-to-film and metallized film structures. The adhesive base is prepared at 30–40 wt% solids in ethyl acetate, with Mowital B 30 H charged at 5–12 wt% of total resin solids; an aliphatic or aromatic polyisocyanate hardener is then added to react with the PVB hydroxyl fraction and the polyol. Viscosity is adjusted to 16–22 s Zahn cup #2 at 25 °C before gravure application at 2.0–3.5 g/m² dry coat weight. Lamination is performed on a solvent-based laminator with oven temperatures of 60–90 °C and nip temperature of 70–90 °C; post-cure is maintained at 40 °C for 48–72 h before slitting. Pot life for the mixed adhesive is generally 4–8 h at 25 °C; viscosity doubling indicates gelation and the batch is discarded. In high-humidity lamination areas above 60% RH, pre-drying of PVB is required before adhesive manufacture, and the mixed adhesive must be blanketed with dry nitrogen to prevent atmospheric moisture from consuming isocyanate. Food-contact laminates are evaluated under FDA 21 CFR 175.105 and EU Regulation 10/2011 for multilayer plastic food-contact materials. Terminal finished product types include retort pouches, metallized coffee and snack laminates, boil-in-bag films, and lidding films for prepared foods.
Mowital B 30 H is formulated into solvent-borne temporary protective coatings that are applied to float glass, sputter-coated architectural glazing, polished ceramic sanitaryware, and anodized aluminium profiles before transit or on-site cutting. The resin is cut in ethanol/butanol or isopropanol/ethyl acetate at 12–18 wt% solids and pigmented with precipitated silica or titanium dioxide to control ultraviolet transmission and peel visibility. Application is by spray or curtain coating at a dry film thickness of 40–80 µm; forced-air drying at 50–80 °C produces a continuous film that peels from glass or metal without adhesive residue. Adhesion is balanced by plasticizer addition, typically 10–20 phr on PVB solids, to prevent spontaneous delamination during handling while retaining peel removal. On architectural glazing lines, the coating is applied after cutting and edge deletion but before insulated glass unit assembly; on ceramic sanitaryware lines, it is applied after glaze firing and before cartoning. Compliance is evaluated under RoHS Directive 2011/65/EU for restricted substances and ASTM D3359-17 or ISO 2409:2020 for adhesion classification; where coatings contact food-handling surfaces, EU Regulation 10/2011 requirements may apply. Terminal finished product types include peelable glass protective films, temporary ceramic sanitaryware coatings, aluminium extrusion protective films, and stainless steel cladding transit films.
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Mowital B 30 H is a polyvinyl butyral resin manufactured by Kuraray Europe GmbH and supplied as a white, free-flowing powder. The product belongs to the Mowital B-series and is characterized by a medium-high molecular weight distribution, with a residual polyvinyl alcohol content typically in the range of 18–21 wt% and a polyvinyl acetate residue below 3 wt%. The acetalization degree determines the balance between film toughness, solvent solubility, and adhesion to polar substrates. In incoming-powder inspection, volatile matter is commonly evaluated according to ISO 3251:2019, ash content according to ISO 3451-1:2019, and glass transition temperature by differential scanning calorimetry according to ISO 11357-2:2020. The resin is soluble in lower alcohols, glycol ethers, and ketone-alcohol blends, but it is insoluble in aliphatic hydrocarbons and water. This solubility profile makes Mowital B 30 H suitable for solvent-based coatings, printing inks, adhesion promoters, and technical binders where the final film must resist aliphatic hydrocarbon contact while retaining re-solubility during application.
Storage of the powder requires moisture control. At relative humidity above 60%, the powder may absorb surface moisture and may form lumps during extended storage in non-sealed containers. Pre-drying is not normally required when the original packaging remains closed and stored below 30 °C. The powder should be added under high-shear conditions to avoid the formation of partially solvated agglomerates in alcohol-rich diluents.
The principal differentiation within the B-series is molecular weight and the resulting solution viscosity. Mowital B 30 H occupies an intermediate position between low-viscosity grades such as B 20 H and high-viscosity grades such as B 45 H or B 60 H. A higher molecular weight increases cohesive film strength, abrasion resistance, and green strength in bonded or cast layers, but it also raises solution viscosity at equal solids and can restrict the amount of resin that can be dissolved in low diluent load formulations. The selection of B 30 H is therefore driven by applications in which a measurable increase in film toughness is required without moving to the high-solvent demand of B 45 H or higher grades.
The comparative data below represent typical ranges reported in manufacturer technical literature and should be verified against the current certificate of analysis for each production batch. Viscosity values are obtained on a 10 wt% solution in ethanol at 20 °C using a Brookfield rotational viscometer at 20 rpm according to ASTM D2196-20.
| Parameter | Mowital B 20 H | Mowital B 30 H | Mowital B 45 H |
|---|---|---|---|
| Weight-average molecular weight, GPC, PMMA standards | 32,000–40,000 g/mol | 55,000–70,000 g/mol | 90,000–120,000 g/mol |
| Brookfield viscosity, 10 wt% in ethanol, 20 °C, 20 rpm | 20–35 mPa·s | 50–80 mPa·s | 180–280 mPa·s |
| Residual polyvinyl alcohol content | 18–21 wt% | 18–21 wt% | 18–21 wt% |
| Glass transition temperature, DSC | 68–72 °C | 68–72 °C | 68–72 °C |
In coating and ink formulations, the practical effect of the molecular weight difference appears most clearly in solvent release and film setting behavior. Mowital B 20 H permits higher-solids vehicles at equivalent application viscosity and is therefore preferred when film weight must be deposited rapidly in flexographic or gravure printing. Mowital B 30 H provides a higher cohesive strength after solvent evaporation, which is observable as reduced blocking and improved crease resistance in printed or coated films. Mowital B 45 H extends this trend but requires a higher solvent fraction and may exceed 500 mPa·s at 10 wt% solids in ethanol, restricting atomization in high-speed coating lines.
A typical anti-corrosion wash primer for galvanized steel or aluminum substrates is compounded by dissolving Mowital B 30 H in a solvent blend of isopropanol, butanol, and toluene at 7–9 wt% resin solids. Phosphoric acid is added at 3–5 wt% of the total formulation to activate the metal surface and catalyze partial crosslinking of the hydroxyl sites on the polyvinyl butyral backbone. Zinc phosphate or zinc tetroxychromate inhibits flash rusting and contributes to passivation. The primer is applied at dry film thicknesses of 5–10 µm using conventional spray equipment. Adhesion performance is evaluated after 24 h conditioning at 23 °C and 50% relative humidity by cross-cut testing according to ASTM D3359-17; values of 4B or 5B are typical for cleaned hot-dip galvanized substrates. The high molecular weight of B 30 H provides resistance to under-film corrosion creep when the primer is overcoated with epoxy or polyurethane build coats. Operational boundaries include the need to avoid amine-based curing agents in direct combination with the acidified primer because premature neutralization of the phosphoric acid catalyst results in loss of adhesion and uneven film coalescence.
In continuous coil-coating lines, the primer is applied to degreased steel or aluminum at line speeds of 30–80 m/min. Rapid solvent evaporation is required before overcoating. The resin must remain soluble in the ketonic or alcoholic solvent tail used for cleanup of coating rolls. Mowital B 30 H is preferred over lower-molecular-weight grades in this application because it retains a measurable edge-retention characteristic at the sheet edge and reduces the incidence of primer wash-through at cut edges after forming operations. Published data for this specific configuration is limited; therefore, the above conditions are operational boundaries rather than formal specification values and should be verified on the target coil line.
In solvent-based flexographic and gravure inks for corona-treated biaxially oriented polypropylene and polyethylene terephthalate films, Mowital B 30 H is typically incorporated at 6–10 wt% of the finished ink as the primary film-forming binder. The resin is first converted into a vehicle at 25–30 wt% solids in an 80:20 ethyl acetate/ethanol blend using a high-shear dissolver operating at a tip speed of 10–12 m/s for 45–60 min. The resulting vehicle exhibits a Brookfield viscosity of 1,200–2,500 mPa·s at 25 °C, depending on the presence of co-binder nitrocellulose or polyurethane resins. Final ink viscosity is adjusted to 20–28 s on a DIN 4 mm flow cup at 25 °C according to DIN 53211.
The solvent release rate of B 30 H is slower than that of B 20 H, which extends open time on the printing plate and reduces dry-in at fine anilox cell depths below 20 µm. This behavior is relevant in line work below 60% screen ruling and in high-temperature pressrooms where ambient temperatures exceed 28 °C. However, the higher molecular weight also increases re-solubility resistance; press stops longer than 15 min may require a cleaning solvent with a stronger ketone fraction to remove ink from the cells of ceramic anilox rollers. Adhesion to treated film is assessed by tape peel testing according to ASTM D3359-17, with a minimum acceptable rating of 5B after 72 h of conditioning at 23 °C and 50% relative humidity.
In ceramic tape casting, Mowital B 30 H serves as the green binder in non-aqueous slurries used for alumina and barium titanate substrates. The binder is dissolved at 8–12 wt% of the ceramic powder mass in a toluene/ethanol mixture, with plasticizer levels between 2–5 wt% of the polymer content. Milling is performed in a planetary ball mill with yttria-stabilized zirconia media for 18–24 h to achieve a Hegman fineness below 5 µm. The slurry is deaired under vacuum of 20–50 hPa and cast onto silicone-coated polyester carrier film at wet film thicknesses of 100–500 µm. Drying proceeds through a three-zone oven at 60 °C, 70 °C, and 80 °C. The resulting green tape has sufficient tensile strength and flexibility to be handled, cut, and laminated without cracking. Binder burnout is performed in air with a hold at 450 °C and a heating rate of 2 °C/min to 400 °C. The low ash content of B 30 H, typically below 0.1 wt% when tested according to ISO 3451-1:2019, reduces inorganic residue after burnout. This property is critical where residual sodium, calcium, or silicon levels must remain below 100 ppm in electronic-grade substrates. The use of B 30 H instead of lower-molecular-weight B 20 H increases green tape tensile strength by limiting binder migration during drying. The selection of B 30 H over higher-viscosity B 45 H avoids excessive slurry viscosity that would require dilution and reduce green density after drying.
Quality control of Mowital B 30 H should include both powder characterization and verification of the dissolved vehicle. The following matrix lists the relevant test procedures and standard designations used for batch acceptance and process control. Specific acceptance limits are supplied on the manufacturer certificate of analysis and may vary by production site and end-use regulation.
| Standard | Clause or Method | Measured Property |
|---|---|---|
| ISO 3251:2019 | Method A, 105 °C, 2 h | Volatile matter content |
| ISO 3451-1:2019 | Method A, 600 °C | Ash content |
| DIN 53240-2 | Hydroxyl value, acetylation | Residual vinyl alcohol content |
| ISO 11357-2:2020 | DSC, 10 K/min | Glass transition temperature |
| ASTM D2196-20 | Brookfield rotational viscometer, 20 rpm | Solution viscosity |
| ASTM D3359-17 | Method B, cross-cut tape adhesion | Coating adhesion to metal or film substrates |
For regulatory compliance, the finished article is subject to the applicable end-use framework rather than the resin alone. Under REACH Regulation (EC) No 1907/2006, the importer or formulator must confirm the registration status of the substance in the relevant tonnage band. For electrical and electronic equipment, the homogeneous material limits of Directive 2011/65/EU Annex II apply, including a maximum of 0.1 wt% lead and 0.01 wt% cadmium. Food-contact suitability of an adhesive or coating formulated with Mowital B 30 H must be confirmed under the relevant national or regional migration framework, such as EN 1186-1:2002 or 21 CFR 175.105 for adhesives, based on finished-article testing. The resin alone does not guarantee compliance without verification of the complete formulation and end-use exposure conditions.
