Polyvion ISO-M 00 is a mixed aromatic/aliphatic polyisocyanate based on a toluene diisocyanate (TDI) and hexamethylene diisocyanate (HDI) adduct, supplied as a solvent-based solution at approximately 60% solids in butyl acetate for fast-drying two-component polyurethane coatings. Combining a TDI backbone with HDI modification, it delivers very rapid initial drying, early sandability, and good lightfastness in a single hardener grade. The product is widely used across wood and furniture coatings, industrial finishing, and general two-component polyurethane systems where fast turnaround and reasonable color stability are both required.
Polyvion ISO-M 00 Overview
Polyvion ISO-M 00 belongs to a distinct family of mixed TDI/HDI polyisocyanate adducts, in which toluene diisocyanate and hexamethylene diisocyanate monomers are reacted together into a single hardener resin rather than kept as separate aromatic and aliphatic products. This dual-monomer approach is engineered to combine the very rapid initial drying that aromatic TDI adducts are known for with a measure of the lightfastness and color stability more typical of aliphatic HDI-based hardeners.
Supplied as a solution in butyl acetate at approximately 60% solids, the product is ready to use as the hardener component in two-component systems, requiring only combination with a suitable hydroxyl-functional resin and standard solvent letdown to build a sprayable coating. Because the chemistry still contains an aromatic TDI component, coatings formulated with Polyvion ISO-M 00 offer good but not unlimited lightfastness, and remain best suited to interior wood and furniture applications rather than long-term exterior exposure.
Key Features
- Mixed TDI/HDI adduct chemistry: Polyvion ISO-M 00 combines aromatic and aliphatic diisocyanate monomers in a single hardener, balancing fast drying with improved lightfastness relative to pure TDI adducts.
- Very rapid initial drying: The product supports fast set-to-touch and early handling strength, helping formulators maximize line speed on wood and furniture coating lines.
- Early sandability: Films cured with the product can typically be sanded sooner than with conventional hardeners, supporting tight production schedules in multi-coat finishing systems.
- Good lightfastness for a TDI-containing hardener: The HDI modification improves color retention relative to straight TDI adducts, though it does not match fully aliphatic HDI trimer systems.
- Solvent-based, spray-ready supply form: Supplied at approximately 60% solids in butyl acetate, the product is formulated for straightforward incorporation into finished two-component coatings.
Typical Applications
Polyvion ISO-M 00 is primarily used as the hardener component in fast-drying two-component polyurethane coatings for wood and furniture finishing, where very rapid initial drying, early sandability, and reasonable color retention directly support production throughput. Its mixed TDI/HDI chemistry makes it particularly well suited to multi-coat interior finishing systems producing high-bodied clear or pigmented finishes with just a few coats.
Beyond wood and furniture coatings, the product is also applied in general industrial coatings and other two-component polyurethane systems that prioritize fast turnaround alongside moderate lightfastness. For general-purpose fast-drying pure TDI adduct alternatives, formulators often evaluate Polyvion ISO-M 14 alongside this grade to compare drying speed and color stability.
Technical Specifications
The product is characterized by the following indicative technical parameters; confirmed values will be provided in the final product specification sheet.
- Chemical type: Mixed aromatic/aliphatic polyisocyanate (TDI/HDI adduct)
- Base chemistry: TDI/HDI adduct
- Supply form: Solution in butyl acetate, approximately 60% solids
- NCO content: To be confirmed based on the final specification sheet.
- Viscosity: To be confirmed based on the final specification sheet.
- Monomeric TDI + HDI content: To be confirmed based on the final specification sheet.
- Color (Iodine value): To be confirmed based on the final specification sheet.
- Function: Curing agent / hardener for fast-drying, lightfast two-component PU coatings
Mixed TDI/HDI Adduct Chemistry
Unlike single-monomer polyisocyanate hardeners, mixed TDI/HDI adducts such as Polyvion ISO-M 00 are built by reacting both toluene diisocyanate and hexamethylene diisocyanate into one adduct structure. This hybrid architecture is specifically engineered to capture the very rapid film formation associated with TDI-based resins while incorporating some of the color stability benefits of aliphatic HDI chemistry, giving formulators a hardener that sits between conventional aromatic and fully aliphatic options.
Because the product still contains an aromatic TDI component, it is not a substitute for fully aliphatic HDI trimer hardeners in applications requiring long-term outdoor UV color stability; formulators targeting exterior or highly UV-exposed substrates should evaluate aliphatic options such as Polyvion HDI-T 75 instead. As with all TDI- and HDI-based hardeners, the product is moisture-sensitive and should be protected from humidity during storage and handling, since reaction with water generates carbon dioxide and can compromise film quality or cause gassing in closed containers.
Storage Recommendations
- Store in the original, tightly closed container, protected from moisture, heat, and foreign material.
- Recommended storage temperature: 0-30°C.
- Storage at higher temperatures will increase viscosity and reduce NCO content over time.
- Shelf life: To be confirmed based on the final specification sheet.
Documentation & Compliance
Each shipment of the product is supported by standard quality and compliance documentation to help customers manage incoming inspection, formulation approval, and downstream regulatory reporting.
- Certificate of Analysis (COA): Provided per batch
- Safety Data Sheet (SDS): Mandatory prior to handling
- Labels: Prepared in accordance with applicable regulations
- Industrial and professional use only
Formulation Guidance
When formulating two-component coatings with this curing agent, the NCO:OH stoichiometric ratio, resin selection, and drying conditions all influence pot life, initial dry time, sandability, and final film hardness. The product shows good compatibility with polyester polyol grades and only limited compatibility with hydroxyl-functional acrylates, so resin selection should be confirmed against the intended co-reactant before scale-up. Formulators are encouraged to run a small formulation matrix, adjusting stoichiometry and solvent blend, to identify the process window that delivers the target balance of fast initial drying and film performance. For comparison against a fully aliphatic curing agent option, see also Polyvion ISO-M HT10.
Because the product is supplied as a solvent-based solution, solvent selection at the letdown stage should favor PU-grade solvents free of reactive hydroxyl or amino groups and low in water content, to preserve pot stability and avoid premature gelation. As with all isocyanate hardeners, moisture exclusion during storage, mixing, and application is critical to achieving consistent film quality.
Packaging & Logistics
- Packaging: Approved industrial packaging
- MOQ: Subject to packaging configuration
- Lead time: Indicative lead time, to be confirmed upon order acceptance
- Incoterms: Quoted case by case
Polyvion ISO-M 00: Safety & Handling
Polyvion ISO-M 00 should be handled in accordance with standard industrial hygiene practices for mixed aromatic/aliphatic polyisocyanate hardeners. Users are advised to review the Safety Data Sheet prior to handling and to implement appropriate personal protective equipment and engineering controls as specified therein, since isocyanate vapors and mist can present respiratory and skin sensitization hazards if ventilation is inadequate. As with all curing agents, small-scale compatibility and cure trials are recommended before full-batch formulation to confirm performance in the target system.
Safety Data Sheet and destination-compliant labeling information for the product are available upon request. For related curing agent options, see also Polyvion ISO-M 14 and Polyvion HDI-T 75.