Red steel drums of HDI aliphatic diisocyanate loaded for shipment

HDI Hexamethylene-1,6-Diisocyanate

Name: HDI Hexamethylene-1,6-Diisocyanate
Brand: KingZhi Chemistry

The aliphatic building block behind non yellowing polyurethane coatings

Overview

What This Product Is and Who Buys It

HDI is a colourless liquid aliphatic diisocyanate with a pungent odour and high reactivity. It is rarely used neat. Its role is as the raw material from which HDI trimer, biuret and uretdione polyisocyanates are synthesised for two component polyurethane coatings, adhesives, elastomers and sealants.

Key Benefits

Excellent weather resistance and non yellowing performance in the derivatives made from it
High gloss retention and UV stability for exterior and automotive topcoats
High reactivity as a synthesis feedstock
Supplied at 99.5 percent purity minimum with stated chlorine limits

Automotive clearcoat application built on HDI derived polyisocyanates

Interior textiles finished with light stable polyurethane coatings

Applications

Where This Material Is Used

Automotive refinish and OEM coatingsHigh grade wood coatingsIndustrial and anticorrosion coatingsPlastic coatingsAdhesives and elastomers

Who It Is For

Polyisocyanate manufacturers synthesising trimer and biuret derivatives
Coating resin producers
Adhesive and elastomer compounders

Problems It Solves

Aromatic isocyanate based topcoats amber and lose gloss under UV exposure
Derivative synthesis needs a feedstock with tightly controlled purity and hydrolysable chlorine
Colour value drift in the feedstock shows up as colour in the finished clearcoat

Technical

Technical Features

Colourless liquid at ambient temperature
Molecular formula C8H12N2O2
Aliphatic straight chain structure, no aromatic ring to absorb UV
Pungent irritating odour, requires appropriate handling and ventilation

Specifications

These figures are the manufacturer grade data as published for this product family. Anything not listed below has not been confirmed and is marked TBC on request rather than estimated.

Property	Specification
Appearance	Colourless liquid
NCO Content (%)	≥ 49.7
Purity (%)	≥ 99.5
Colour Value	≤ 30
Hydrolysed Chlorine Content	≤ 100 mg/kg
Density at 20°C	1.05 g/cm³

Grades listed are representative and not exhaustive. Ask for the batch certificate of analysis on the grade you intend to buy.

Comparison

How It Compares

Within the Isocyanates category this product is positioned by the numbers in the table above rather than by a marketing claim. Compare NCO content, viscosity, equivalent weight or hydroxyl value against the alternative you are considering, and if the two are close, ask us for both samples and decide on your own line.

Quality and Documentation

Quality control runs across incoming raw materials, production and finished product inspection. A batch certificate of analysis is supplied with every shipment. We are a supply and trading company working with named manufacturers and OEM partners, so certification held by the producing plant is provided on request per grade rather than claimed here as ours.

Customisation

Customised grades and packing formats are available through our OEM partners and specialised manufacturing facilities. Tell us the property you need to move and we will say whether it is a grade change, a packaging change or not possible.

Industries

Industries Using This Product

Dark sports car finished with a high gloss automotive clearcoat

IndustryAutomotive and Transportation

Automotive coatings and interiors are where yellowing resistance, gloss retention and seat comfort are all judged by the end customer rather than by a laboratory.

See Applications

Solutions

Where This Product Fits In A Wider System

Illustration of sea rail road and air freight linked into one global network

SolutionGlobal Supply Chain and Sourcing

Regulated chemical raw materials are not hard to buy. They are hard to buy repeatedly, on time, with documentation that clears customs the first time.

See The Process

FAQ

HDI Questions

Is HDI used directly in coatings?

Almost never. HDI monomer is the feedstock for HDI trimer, biuret and uretdione polyisocyanates, which is the form that goes into a coating. If you are formulating a 2K topcoat, look at our HDI Trimer or HDI Biuret pages instead.

What is the hydrolysable chlorine limit?

100 mg/kg maximum on this grade. Chlorine content affects both storage stability and the reactivity of the derivatives you synthesise from it.

Why does HDI cost more than TDI?

Aliphatic chemistry is more expensive to produce than aromatic. You pay the difference to get a coating that does not yellow, so it is only worth paying on visible exposed surfaces.

What packaging is available?

Contact us with your volume. Standard packing for this category is 200 kg steel drums with hazard packing and export documentation prepared as part of the order.