| HS Code | 724161 |
| Product Name | Mowital B 60 HH |
| Chemical Family | Polyvinyl butyral (PVB) |
| Appearance | White to slightly yellow free-flowing powder |
| Viscosity | Approx. 150 mPa·s (10% in ethanol, 20°C) |
| Molecular Weight | Approx. 120,000 g/mol |
| Butyral Group Content | Approx. 78 wt% |
| Hydroxyl Group Content | Approx. 20 wt% |
| Acetyl Group Content | Approx. 1 wt% |
| Glass Transition Temperature | Approx. 70°C |
| Density | Approx. 1.1 g/cm³ at 20°C |
| Bulk Density | Approx. 250 kg/m³ |
| Solubility | Soluble in alcohols, esters, ketones, and glycol ethers; insoluble in water |
As an accredited Mowital B 60 HH factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Mowital B 60 HH is supplied in 20 kg polyethylene-lined paper bags, protecting the powder from moisture and contamination during transport. |
| Container Loading (20′ FCL) | Mowital B 60 HH loaded as 20′ FCL, packed in sealed bags on pallets, secured, ventilated, protected from moisture. |
| Shipping | Mowital B 60 HH is a polyvinyl butyral resin supplied as a free-flowing powder. Ship in sealed, moisture-proof packaging to prevent caking and humidity absorption. Keep dry, cool, and away from ignition sources; avoid generating dust clouds. No special dangerous-goods classification under standard conditions. |
| Storage | Store Mowital B 60 HH in its original, tightly sealed container in a cool, dry, well-ventilated area. Protect from moisture, direct sunlight, and high temperatures to prevent clumping or degradation. Keep away from ignition sources and incompatible materials. Under proper conditions, shelf life is typically several years. Always follow the manufacturer’s safety data sheet. |
| Shelf Life | Store in a cool, dry place. Shelf life is typically 2 years from production date when unopened. |
Incorporated as the primary film former in high-solids flexographic and gravure lamination inks, Mowital B 60 HH is typically dissolved in a two-component solvent blend of ethanol and ethyl acetate at a resin content of 8–15 wt% before addition of a cyclohexanone-formaldehyde hard resin and a plasticizer such as acetyl tributyl citrate at 5–15 phr on resin solids. Final ink viscosity measured on a Brookfield LV viscometer at 25 °C is normally held within 25–50 mPa·s for flexo applications, while gravure grades may run at 15–35 s through a DIN 4 mm flow cup depending on cylinder engraving depth. The high-molecular-weight PVB fraction improves pigment wetting on corona-treated polyethylene terephthalate and orientated polypropylene, where treated film surface energy must remain in the 38–42 dyn/cm range; below 36 dyn/cm, ink transfer and substrate wetting become inconsistent even when adhesion promoters are added. After printing and solventless adhesive lamination to aluminium-metallised OPP, the resulting flexible packaging laminate is assessed according to ASTM F904 or ISO 11339; peel strength below 2.0 N/15 mm commonly indicates cohesive failure inside the ink layer rather than at the adhesive interface, driven by retained ethanol or insufficient binder molecular weight. For food-contact packaging structures, formulations must be screened under EU 10/2011 migration conditions and, where the printed structure is part of an adhesive lamination, under FDA 21 CFR 175.105; total retained ethanol and ethyl acetate is controlled to <10 mg/m² by headspace GC-MS after a 60 °C / 24 h vacuum bake. Mowital B 60 HH also increases resistance to cold-seal release lacquers and improves heat resistance during pouch sealing at 120–150 °C.
In a two-pack wash primer for degreased steel or hot-dip galvanized structural steel, the base component contains Mowital B 60 HH at 7–10 wt% in an ethanol/n-butanol solvent system together with zinc phosphate or zinc aluminium phosphate at 5–8 wt%; the acid component consists of 85% phosphoric acid diluted to 30–50 wt% in isopropanol. Mixed ready-to-spray viscosity is generally adjusted to 18–22 s Ford 4 cup, giving a dry film thickness of 5–10 μm per pass. Phosphoric acid passivates the metal surface while the PVB forms a thin thermoplastic film with sufficient flexibility to survive post-forming operations. Adhesion is evaluated by cross-cut test ISO 2409 or ASTM D3359; class 0/5B is expected on blasted steel without topcoat. Neutral salt spray performance according to ISO 9227 is normally 240–500 h when overcoated with a two-pack epoxy or polyurethane topcoat, but the wash primer alone is not a barrier coating. Pot life of the mixed material is typically limited to 6–8 h at 20 °C because the acid catalyses partial acetal hydrolysis and gradually destabilizes viscosity. Hexavalent chromium pigments historically used in this system require authorization under REACH and are replaced in current formulations by zinc phosphate; any new formulation must be retested for scribe creep and rust formation according to ISO 12944-6.
Multilayer ceramic tape casting relies on Mowital B 60 HH as the high-molecular-weight binder fraction that controls green tape tensile strength, flexibility, and lamination behavior in alumina and LTCC production. A non-aqueous slurry is prepared from ceramic powder 100 parts, PVB binder 3–8 parts, benzyl butyl phthalate or dibutyl phthalate plasticizer 1.5–4.0 parts, and a fish-oil or phosphate ester dispersant 0.5–2.0 parts in a methyl ethyl ketone/ethanol solvent system at 50–65 wt% solids. The slurry is mixed in a planetary centrifugal mixer followed by vacuum degassing at 20–50 mbar to remove entrapped air before casting; viscosity is typically held at 1500–4000 mPa·s at 25 °C depending on doctor blade gap. Casting on silicon-coated Mylar or PET carrier is performed with a doctor blade gap of 50–300 μm, producing dried green tape thickness in the 20–150 μm range after solvent evaporation at 60–80 °C. The high-molecular-weight PVB provides green tensile strength sufficient for laser or mechanical blanking; loss of strength below 1.0 MPa is commonly considered unacceptable for automated via punching. Debinding in a circulating air kiln uses a controlled ramp of 0.2–0.5 °C/min through the 250–450 °C window, where PVB decomposition removes the organic phase without disturbing ceramic particle packing. Published data for B 60 HH specifically in low-temperature co-fired ceramic systems is limited, so pilot trials with TGA-FTIR and green density measurement are required before scale-up.
Heat-sealable coatings for aluminium foil lids, pharmaceutical blister lidding, and dairy portion packs are formulated with Mowital B 60 HH when higher sealing temperatures are required to prevent blocking on the reel. The resin is dissolved in ethanol or an ethanol/methyl ethyl ketone blend at 12–18 wt% solids, compounded with 5–15 phr of acetyl tributyl citrate or adipate polyester plasticizer and 0.5–2.0 phr of silica antiblocking agent. Coating is applied by reverse gravure to hard temper aluminium foil at a dry coat weight of 1.5–4.0 g/m², then dried at 120–150 °C web temperature to reduce residual solvent below 5 mg/m². Seal initiation temperature measured by ASTM F1921 hot-tack testing typically moves upward by 5–10 °C compared with lower-viscosity PVB resins, making B 60 HH suitable for lidding stocks sealed against high-melting polystyrene or PVC/PVDC sheet. Ultimate seal strength is tested on ASTM F88 with 25 mm wide specimens; values in the 6–10 N/25 mm range are commonly targeted for dairy lidding. The higher molecular weight also increases the tendency of the coating to retain solvent in thick sections above 6 g/m², which can create pinholes and seal failure during high-speed filling. Compliance for food-contact lidding is evaluated under EU 10/2011 and, for US structures, under 21 CFR 175.300 or 21 CFR 175.105 depending on whether the coating functions as a surface coating or adhesive.
Modification of resole phenolic adhesives with Mowital B 60 HH produces B-staged film adhesives for metal-to-metal bonding that exhibit higher peel toughness than unmodified phenolic films without sacrificing lap shear strength. The resin is blended at 20–35 parts per 100 parts of phenolic solids in methyl ethyl ketone or acetone, cast onto release paper, and B-staged at 80–100 °C to a tack-free film with controlled volatile content. Cure is performed under 0.7–1.4 MPa pressure at 150–180 °C for 30–60 min; aluminium 2024-T3 bonded specimens are tested according to ASTM D1002. The PVB phase acts as a flexibilizing interpenetrating component that reduces crack propagation in the brittle phenolic matrix, which is critical when the bonded assembly is subjected to vibrational loading or thermal cycling between -40 °C and 80 °C. Floating roller peel testing under ASTM D3167 generally shows a measurable increase in peel strength compared with unmodified phenolic resin, although published data for B 60 HH in this exact formulation is limited and must be confirmed with factorial trials on actual production autoclaves. This type of film adhesive is used in metal sandwich panel fabrication, clutch and brake lining bonding, and industrial laminate assembly where resistance to organic solvents and sustained heat is required. Flammability and smoke properties for interior applications are not automatically satisfied by PVB addition; additional flame retardant screening under FAR 25.853 or ISO 5660 is required depending on the end-use sector.
Extrusion-grade polyvinyl butyral compounds for laminated safety glass interlayers are processed from high-molecular-weight resins such as Mowital B 60 HH after controlled moisture removal to below 0.4 wt% water content. The resin is dry-blended with 25–45 phr of triethylene glycol bis(2-ethylhexanoate) or dibutyl adipate plasticizer, 0.01–0.5 phr of potassium acetate or magnesium salt adhesion modifier, and a hindered amine light stabilizer before compounding on a co-rotating twin-screw extruder with an L/D ratio of 40:1 to 52:1. Melt temperature at the sheet die is maintained between 180 °C and 220 °C; temperatures above 240 °C must be avoided due to rapid thermal degradation and crosslinking. The extruded sheet is calendered to a thickness of 0.38–1.52 mm and embossed with a random surface pattern to facilitate air removal during glass lay-up. Laminated glass is produced in a prepress roll or vacuum bag at 80–140 °C followed by an autoclave cycle at 120–150 °C and 1.0–1.5 MPa. Performance after lamination is assessed according to ISO 12543 for safety glass interlayers and EN 12600 impact resistance; pummel adhesion values are adjusted by the salt content to meet the specified 3–7 pummel unit range for automotive windshields. Moisture uptake above 0.5 wt% before extrusion produces bubbles and local delamination after autoclaving, which is the dominant production failure in this segment.
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Mowital B 60 HH is a polyvinyl butyral resin produced by acid-catalysed acetalization of polyvinyl alcohol with n-butyraldehyde. It is supplied as a white, free-flowing powder with a non-volatile content of at least 97.5% when tested at 105 °C for 3 h under ISO 3251. Residual polyvinyl alcohol content is 18–21 wt%, and residual polyvinyl acetate content is 1–3 wt%; these unacetalized polar groups control solvent affinity, pigment wetting, and adhesion to metal oxides. The defining specification for the HH designation is the dynamic viscosity of a 10 wt% solution in ethanol at 20 °C, reported as 90–120 mPa·s by DIN 53015. A lower-viscosity material such as Mowital B 60 H falls below this range under identical conditions; the difference arises from a higher molar mass fraction rather than from a change in residual hydroxyl or acetate content. The glass transition temperature of the neat resin is approximately 68 °C (ISO 11357-2), and the solid density is approximately 1.10 g/cm³ (ISO 1183-1). Absolute molecular weight is not consistently disclosed in manufacturer documentation; the grade is therefore specified by solution viscosity and residual functionality instead of a discrete molar mass.
The polymer dissolves in ethanol, ethyl acetate, methyl ethyl ketone, and selected aromatic/alcohol mixtures. Aliphatic hydrocarbon addition is usually restricted because it can precipitate high-molecular-weight PVB fractions. The solution behaviour has practical implications for ink dilution and for cleaning of press parts.
| Dynamic viscosity, 10 wt% in ethanol at 20 °C | 90–120 mPa·s | DIN 53015 |
| Polyvinyl alcohol content | 18–21 wt% | Manufacturer data |
| Polyvinyl acetate content | 1–3 wt% | Manufacturer data |
| Glass transition temperature | ~68 °C | ISO 11357-2 |
| Density | 1.10 g/cm³ | ISO 1183-1 |
| Non-volatile content | ≥97.5% | ISO 3251 |
These values are batch-release data from the producer; the certificate of analysis must govern the acceptance decision.
Reverse-doctor blade application on an enclosed-chamber gravure station is constrained by a narrow viscosity window at the operating cylinder cell volume and line speed. Because the 10 wt% ethanol solution viscosity of Mowital B 60 HH is 90–120 mPa·s, a formulation that uses the resin as sole binder at 8–10 wt% total non-volatile content can exceed the supply limit of a magnetically loaded chamber blade at high web speeds. The concentration–viscosity relationship is non-linear; an increase from 10 wt% to 15 wt% may raise viscosity by more than 2.5-fold depending on solvent class and temperature. Addition of ethyl acetate or ethanol to reduce efflux time to 20–25 s in a 4 mm cup (DIN 53211) lowers dry film thickness and may reduce colour strength if the pigment-to-binder ratio is not increased. The higher cohesion of the deposited film is observed after drying; cross-cut adhesion to corona-treated polyethylene terephthalate and biaxially oriented polypropylene is acceptable when surface energy is maintained above 38 mN/m, tested according to ISO 2409:2013. The powder should be stored at relative humidity below 60% and below 30 °C; moisture uptake above 0.3 wt% can cause agglomeration and require drying before dissolution. In practice, converters reduce the fraction of B 60 HH or blend it with lower-viscosity Mowital B 60 H to match gravure transfer; published press-specific maximum speeds for the neat grade are limited.
Wash primers based on PVB, phosphoric acid, and active pigments rely on the hydroxyl functionality of PVB to promote adhesion to steel and aluminium without the use of isocyanate hardeners. Mowital B 60 HH supplies 18–21 wt% residual polyvinyl alcohol-derived hydroxyl groups; this level is sufficient for wetting hydrated oxide surfaces, while the acetate fraction remains low enough to avoid immediate water sensitivity. In the acid environment of a two-pack wash primer, the higher molecular weight of the HH grade increases intercoat adhesion but slows solvent release. A formulation with 0.5–1.0 wt% phosphoric acid based on total liquid must be held before application because viscosity drift can occur as acetate groups hydrolyse; the free acid number is monitored by ISO 3682, and the effect of moisture is assessed by ISO 3251. Pull-off adhesion after 7 days at 23 °C according to ISO 4624:2016 provides a quantitative measure of metal bond development. The resin is incompatible with strong alkaline pigments and with amine-based adhesion promoters at elevated temperature, because alkaline saponification of residual acetate groups generates acetaldehyde and reduces molecular weight. Anti-corrosive performance is formulation-dependent and should not be extrapolated from binder chemistry alone.
In ceramic tape casting of alumina and barium titanate dielectrics, Mowital B 60 HH is used as a high-green-strength binder in non-aqueous slip systems. The binder is added at 4–8 wt% based on ceramic powder and processed with a dispersant, solvent, and plasticizer; the higher solution viscosity of the HH grade increases green tape tensile strength and reduces edge cracking during carrier release. Higher loading can exceed the viscosity limit of a tape-casting head, so the solvent level and milling torque must be adjusted. Binder burnout is performed in air at temperatures below 500 °C; ash content after 600 °C is controlled below 0.05 wt% by ISO 3451 to minimise conductive residue. In practice, powder moisture above 0.3 wt% causes slurry rheology shift and pinholes; pre-drying at 40–50 °C for 4–8 h is therefore used before compounding. A dissolver with tip speed between 10 m/s and 15 m/s is specified for initial dispersion. Published data for specific dielectric formulations containing Mowital B 60 HH is limited; the burnout schedule must be confirmed by thermogravimetric analysis because residual carbon reduces dielectric breakdown strength.
Solvent release from printed PVB layers is controlled by free-volume collapse and chain-entanglement diffusion. Mowital B 60 HH retains solvents longer than lower-viscosity grades at equal dry-film thickness; multi-zone drying with air temperatures between 60 °C and 90 °C and high impingement velocity is required to reduce residual solvent before rewinding. Blocking resistance of printed or coated films is tested under defined load and temperature using ASTM D3354; failure appears as surface deformation or transfer when the films are separated. The higher cohesive strength of the HH grade reduces cohesive delamination in laminating adhesives, but it can increase the heat-seal initiation temperature unless a plasticizer or adhesion promoter is included. Heat-seal initiation for PVB-based coatings is commonly observed in the 90–120 °C range; however, the measured value depends on the plasticizer, substrate, and dwell time, and published values for Mowital B 60 HH in specific heat-seal formulations are limited. Corona-treated low-density polyethylene substrates with surface energy below 36 mN/m should be re-treated immediately before coating to avoid adhesion loss; wettability can be measured by ISO 8296.
Compounding of Mowital B 60 HH with plasticizer for extruded PVB sheet and safety-glass interlayer grades requires residual moisture below 0.3 wt% before melt processing. The neat resin is not recommended for melt extrusion without plasticizer because thermal degradation becomes significant above 220 °C. Plasticizers such as triethylene glycol bis(2-ethylhexanoate) or dibutyl phthalate are incorporated at 15–30 phr; a co-rotating twin-screw extruder with an L/D ratio of 44:1 and vacuum devolatilization removes residual volatiles. The melt temperature is held below 220 °C, and die-zone temperature variation should remain within ±5 °C; larger deviations produce thickness bands and bubble defects that reduce laminating clarity. The higher molecular weight of B 60 HH increases tensile strength and tear resistance at constant plasticizer loading, but it also increases screw torque and melt pressure relative to lower-viscosity grades. Tensile properties are measured after conditioning for 48 h at 23 °C and 50% relative humidity according to ISO 527-3:2018 or ASTM D638-14. Published production-scale extrusion data for this specific grade is limited; start-up conditions must be validated on the target line.
Incoming inspection programs for Mowital B 60 HH should verify dynamic viscosity, non-volatile content, acid number, and ash content against the certificate of analysis. Samples are conditioned at 23 °C and 50% relative humidity before analytical weighing. The resin is not classified as hazardous under REACH, but it remains subject to registration and safety data sheet documentation. In food-contact applications, compliance is not conferred by the polymer alone; migration testing under EU Regulation 10/2011 or the applicable positive list such as FDA 21 CFR 175.300 must be completed for the finished laminate or coating. Solvent-based systems containing PVB resins may require workplace exposure assessment for ethanol or ethyl acetate according to local occupational exposure limits.
| Non-volatile content | ISO 3251 |
| Dynamic viscosity | DIN 53015 |
| Glass transition temperature | ISO 11357-2 |
| Density | ISO 1183-1 |
| Ash content | ISO 3451 |
| Acid number | ISO 3682 |
| Cross-cut adhesion | ISO 2409:2013 |
| Pull-off adhesion | ISO 4624:2016 |
| Blocking resistance | ASTM D3354 |
| Tensile properties of films | ISO 527-3:2018 |
| Food-contact migration assessment | EU Regulation 10/2011 or FDA 21 CFR 175.300 |
In aqueous systems, Mowital B 60 HH cannot be dissolved directly because polyvinyl butyral is not water-soluble; dispersions require surfactants, plasticizers, and limited co-solvent. Alkaline hydrolysis becomes significant above pH 9 and results in viscosity loss and acetaldehyde generation. The grade should be kept in closed containers below 30 °C; manufacturer shelf-life guidance is typically 24 months from production when stored under dry conditions. For high-abrasion metal primers, the higher molecular weight improves toughness, but the increase in solution viscosity may force a reduction in application solids rather than a direct replacement of Mowital B 60 H.
