Why is this HDI trimer more lightfast than aromatic isocyanates?

Its aliphatic structure resists UV-induced degradation, so cured films remain non-yellowing and retain gloss better during exterior exposure. This makes it suitable for topcoats and clearcoats that must keep their color and appearance under sunlight.

What NCO content should I use for formulation calculations?

This commercial grade is specified at 21.8 +/- 0.3% NCO and is supplied as a 100% non-volatile liquid. The actual NCO content should be confirmed for the selected batch and used with the hydroxyl value of the polyol to calculate the correct mixing ratio.

How should the product be thinned for application?

It is supplied solvent-free and can be thinned with dry urethane-grade esters or ketones such as butyl acetate or propylene glycol monomethyl ether acetate. Solvents must contain less than 0.05% water and be free of reactive hydroxyl or amino groups.

What storage conditions protect the shelf life of this polyisocyanate?

Store the product in tightly sealed, moisture-protected containers at about 0-30 C. Because it reacts with atmospheric moisture, opened containers should be blanketed or resealed promptly to avoid pressure buildup, viscosity increase, or gelation.

Aliphatic Polyisocyanate (HDI Trimer) CAS 28182-81-2

Aliphatic Polyisocyanate (HDI Trimer), CAS 28182-81-2, a solvent-free HDI-based aliphatic polyisocyanate, is positioned as a crosslinker or hardener for two-component polyurethane coatings and adhesives. Confirm the NCO content, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 28182-81-2
Synonyms: HDI Trimer, Polymeric HDI, Hexamethylene Diisocyanate Homopolymer, Aliphatic Polyisocyanate
Einecs: 500-060-2
Molecular Formula: (C8H12N2O2)n
Grade: Industrial / coating grade
Package: Standard export packaging

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Product Description

Aliphatic Polyisocyanate (HDI Trimer) CAS 28182-81-2 is an HDI-based aliphatic polyisocyanate with EC 500-060-2 and molecular formula (C8H12N2O2)n.

Synonyms: HDI trimer; Hexamethylene diisocyanate homopolymer; Polymeric HDI.

CAS: 28182-81-2.

Molecular formula: (C8H12N2O2)n.

It is supplied as a 100% non-volatile, solvent-free liquid.

It is used mainly as a crosslinker or hardener in two-component polyurethane coatings and adhesives.

Its aliphatic structure resists UV-induced degradation, giving non-yellowing cured films.

It is used in automotive refinish and OEM clearcoats, industrial finishes, plastic and wood coatings, and adhesives.

A common commercial grade has about 21.8 +/- 0.3% NCO content.

It is usually thinned with dry urethane-grade esters or ketones such as butyl acetate.

Confirm NCO content, viscosity, color, and residual isocyanate monomer for the chosen batch.

Check the mixing ratio against the polyol hydroxyl value and application conditions.

Store in tightly sealed, moisture-protected containers at about 0-30 C.

Use appropriate PPE and prevent moisture ingress, spills, or contamination.

Confirm packaging suitable for the liquid form and order quantity, and follow the current SDS.

Every batch is checked for NCO content, viscosity, color, and residual monomer, with COA/TDS/SDS supplied per grade.

Confirm NCO content, packaging, and grade as required.

The page is an RFQ entry point and does not state stock, price, MOQ, or fixed lead time.

For an RFQ, state the intended application, required grade, quantity, packaging, destination, and document needs.

FAQ - Technical & Supply Chain

Q:
What is Aliphatic Polyisocyanate (HDI Trimer) CAS 28182-81-2 used for?

A: It is a solvent-free HDI-based aliphatic polyisocyanate used mainly as a crosslinker or hardener in two-component polyurethane coatings and adhesives. Typical uses include automotive refinish and OEM clearcoats, industrial protective finishes, plastic coatings, wood coatings, and high-performance adhesives.
Q:
Why is this HDI trimer more lightfast than aromatic isocyanates?

A: Its aliphatic structure resists UV-induced degradation, so cured films remain non-yellowing and retain gloss better during exterior exposure. This makes it suitable for topcoats and clearcoats that must keep their color and appearance under sunlight.
Q:
What NCO content should I use for formulation calculations?

A: This commercial grade is specified at 21.8 +/- 0.3% NCO and is supplied as a 100% non-volatile liquid. The actual NCO content should be confirmed for the selected batch and used with the hydroxyl value of the polyol to calculate the correct mixing ratio.
Q:
How should the product be thinned for application?

A: It is supplied solvent-free and can be thinned with dry urethane-grade esters or ketones such as butyl acetate or propylene glycol monomethyl ether acetate. Solvents must contain less than 0.05% water and be free of reactive hydroxyl or amino groups.
Q:
What storage conditions protect the shelf life of this polyisocyanate?

A: Store the product in tightly sealed, moisture-protected containers at about 0-30 C. Because it reacts with atmospheric moisture, opened containers should be blanketed or resealed promptly to avoid pressure buildup, viscosity increase, or gelation.

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