HDI (hexamethylene diisocyanate) is an aliphatic isocyanate raw material for high-performance polyurethane coatings, paints and curing agents. Its aliphatic structure gives PU coatings outstanding non-yellowing, colour retention and weather resistance — ideal for automotive refinish, high-end wood and plastic paints, industrial and anti-corrosion coatings. Low viscosity (~3 mPa·s) and high NCO content (> 49.7%) make it a versatile crosslinker and PU curing agent.
> 49.7%
NCO content
< 30
Colour (Pt–Co) near water-white
~3
Viscosity mPa·s (25 °C)
Aliphatic
non-yellowing UV stable
~1.05
density g/cm³ (20 °C)
Key Features
Non-yellowing & colour-stable Aliphatic backbone keeps coatings clear and colour-fast under sunlight.
Excellent weather resistance Resists UV, humidity, moisture and chalking for durable outdoor finishes.
High NCO, low viscosity > 49.7% NCO and ~3 mPa·s for efficient crosslinking and easy formulation.
Oil, abrasion & chemical resistance Cured coatings are tough, wear-resistant and stand up to chemical attack.
Tunable hardness & flexibility Formulate from hard, glossy clear-coats to flexible elastomeric paints.
Low VOC potential Supports high-solids, low-VOC coating systems for greener formulations.
Applications
Bulk Isocyanate SupplyDrums & PailsPalletised for ExportGlobal Export Loading
Used to produce: PU varnish & clear-coats, automotive refinish paint, high-end wood & plastic paints, industrial & anti-corrosion coatings, elastomeric paints, adhesives and textile finishing agents — and as a PU curing agent / crosslinker.
Technical Specifications
Item
Specification
NCO content
> 49.7%
Colour (Platinum–Cobalt)
< 30
Density (20 °C)
~ 1.05 g/cm³
Viscosity (25 °C)
~ 3 mPa·s
Flash point
~ 135 °C
Hydrolysable chlorine
< 350 ppm
Total chlorine content
≤ 800 ppm
Typical values for reference, not a binding specification. Full TDS & MSDS on request.
Why Aliphatic HDI for Coatings
Stays clear outdoors Non-yellowing & chalking-resistant for exterior and clear finishes.
High gloss & hardness Delivers tough, glossy, scratch-resistant top-coats.
Versatile crosslinker Reacts with polyols, acrylics and polyaspartics as a curing agent.
Technical support Formulation guidance for clear-coats, paints and curing agents.
Global export & fast reply Export to EU, Latin America, Asia and beyond — we respond within 24 hours.
From Sample to Bulk Order
1. Share your coating Tell us the coating type and resin system — we confirm suitability and grade.
2. Sample & validate Trial batches; we provide TDS, MSDS and COA for your tests.
3. Scale to bulk Confirm the grade and order in bulk with flexible MOQ and tiered lead times.
Frequently Asked Questions
Why HDI (aliphatic) instead of MDI/TDI for coatings?Aliphatic HDI does not yellow under UV, so it is used for clear and coloured top-coats that must stay colour-stable outdoors — unlike aromatic MDI/TDI, which are used mainly for foams.
What coatings is it used for?PU varnish and clear-coats, automotive refinish, high-end wood and plastic paints, industrial and anti-corrosion coatings, and as a PU curing agent / crosslinker.
What is the NCO content and colour?NCO > 49.7% with a low colour (< 30 Pt–Co, near water-white), supporting clear, colour-stable finishes.
Do you provide documentation?Yes — TDS, MSDS and per-batch COA are available; request a sample and we reply within 24 hours.
Need HDI aliphatic isocyanate for coatings?
Get specification confirmation, full TDS & MSDS, and a sample for your coating system.
✓ Non-yellowing aliphatic✓ TDS · MSDS · COA✓ Reply within 24 h
Please complete the form below and our customer support team will be in touch with you shortly. Inquiries submitted through this form will receive priority processing over emails.
