Polyvion ISO-M HT10 is a solvent-free aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI) trimer chemistry, supplied as a low-viscosity liquid hardener for two-component polyurethane coating systems. Built on an isocyanurate-type HDI trimer backbone, it delivers the high chemical resistance, weathering stability, and gloss retention that aliphatic curing agents are valued for, without relying on solvent to achieve a workable viscosity. The product is widely used across automotive refinish, transportation, and industrial finishing applications where a lightfast, high-performance topcoat is required.
Polyvion ISO-M HT10 Overview
Polyvion ISO-M HT10 belongs to the family of HDI trimer (isocyanurate) polyisocyanates, produced by cyclotrimerizing hexamethylene diisocyanate monomer into a ring-structured, higher-functionality curing agent. This trimer architecture gives the product a favorable balance of crosslink density, flexibility, and hardness once cured, along with the low free-monomer content typical of modern HDI trimer grades. Because it is aliphatic rather than aromatic, coatings formulated with it resist yellowing and chalking far better than aromatic isocyanate systems under prolonged UV and outdoor exposure.
Unlike solvent-cut HDI hardeners, Polyvion ISO-M HT10 is supplied solvent-free, allowing formulators to manage total VOC content more precisely and to tailor the solvent package independently in the finished two-component system. This makes the product a convenient building block for both conventional solvent-borne and reduced-VOC industrial topcoat formulations.
Key Features
- Solvent-free HDI trimer chemistry: Polyvion ISO-M HT10 is supplied as a 100% solids liquid, giving formulators full control over VOC content and solvent selection in the finished coating.
- High functionality, low free monomer: The isocyanurate trimer structure provides good crosslink density while keeping residual HDI monomer content low, supporting safer handling and application.
- Excellent weathering and gloss retention: As an aliphatic curing agent, the product supports outstanding resistance to yellowing, chalking, and gloss loss under UV and outdoor exposure.
- Strong chemical and mechanical performance: Coatings cured with the product show good resistance to chemicals and solvents along with hardness and flexibility suited to demanding industrial substrates.
- Broad compatibility: The product can be blended with other aliphatic and aromatic polyisocyanates, polyester polyols, and polyacrylates, supporting flexible two-component formulation design.
Typical Applications
Polyvion ISO-M HT10 is primarily used as the hardener component in two-component polyurethane topcoats for automotive refinish and transportation coatings, where high gloss, color retention, and long-term weatherability are essential performance requirements. Its solvent-free supply form also makes it a practical choice for industrial finishing lines seeking to reduce solvent load without compromising film performance.
Beyond automotive and transportation coatings, the product is also applied in plastic coatings and general industrial or maintenance coating systems that demand durable, lightfast protection. For two-component systems requiring faster drying or different reactivity profiles, formulators often evaluate Polyvion HDI-T 33 alongside this grade to compare cure speed and film hardness development.
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: Aliphatic hexamethylene diisocyanate (HDI) trimer (isocyanurate)
- Base chemistry: HDI trimer
- Supply form: Solvent-free liquid
- NCO content: To be confirmed based on the final specification sheet.
- Viscosity: To be confirmed based on the final specification sheet.
- Free monomer content: To be confirmed based on the final specification sheet.
- Density: To be confirmed based on the final specification sheet.
- Function: Curing agent / hardener for two-component PU coatings
Isocyanurate Trimer Chemistry
HDI trimer curing agents such as Polyvion ISO-M HT10 are produced by catalytically cyclotrimerizing three HDI monomer units into a stable, six-membered isocyanurate ring bearing three reactive NCO groups. This higher-functionality structure allows the cured film to build a denser crosslink network than difunctional isocyanates, contributing to improved hardness, chemical resistance, and durability once reacted with a hydroxyl-functional resin.
Because the trimerization process consumes much of the free HDI monomer, well-manufactured HDI trimer grades carry substantially lower residual monomer levels than the parent diisocyanate, which is an important handling and regulatory consideration for two-component coating formulators. As with all polyisocyanate hardeners, the product should be protected from moisture during storage and use, since reaction with water generates carbon dioxide and can compromise film quality.
Storage Recommendations
- Store in a dry, well-ventilated area away from moisture, heat sources, and direct sunlight.
- Keep containers tightly closed to prevent moisture ingress, which reacts with free isocyanate groups.
- Recommended storage temperature: To be confirmed based on the final specification sheet.
- 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, choice of polyol or polyacrylate resin, and catalyst package all influence pot life, cure speed, and final film properties. Formulators are encouraged to run a small formulation matrix, adjusting stoichiometry and catalyst level, to identify the process window that delivers the target balance of hardness, flexibility, and gloss for the intended substrate.
Because the product is solvent-free, total formulation viscosity and application solids can be tuned more precisely by the solvent package chosen at the letdown stage. As with all isocyanate hardeners, moisture exclusion during storage, mixing, and application is critical to achieving consistent film quality and avoiding surface defects such as pinholing.
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 HT10: Safety & Handling
Polyvion ISO-M HT10 should be handled in accordance with standard industrial hygiene practices for 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 and PPE are 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 HDI-T 33 and Polyvion ISO-M 31.