Name: Aliphatic Urethane Acrylate UA-5200 (Flexible)
Brand: Coatingsink
SKU: aliphatic-urethane-acrylate-ua5200
Availability: InStock

Question 1

Why is an aliphatic urethane acrylate preferred over an aromatic type for flexible UV coatings?

Accepted Answer

Aliphatic urethane acrylates resist yellowing on UV or outdoor exposure because their backbone lacks the chromophoric aromatic rings that undergo photo-oxidative degradation. They are the standard choice wherever optical clarity and long-term non-yellowing are required, such as over-print varnishes, clear leather finishes, and automotive clearcoats.

Question 2

How does hexafunctional UA-5200 achieve flexibility despite its high crosslink density?

Accepted Answer

UA-5200 is engineered with a long, soft aliphatic urethane backbone between the six acrylate end groups. This extended chain provides molecular-level flexibility, resulting in a low Tg of -20 to -5°C and 30–60% elongation at break even after full UV cure. The combination of high functionality and a soft backbone allows it to deliver both good crosslink density (scratch resistance, chemical resistance) and film flexibility on substrates that flex during use.

Appearance	water-white to pale yellow viscous liquid
Tg (cured)	-20 to -5°C (flexible film)
Functionality	6 (hexafunctional)
Viscosity (60°C)	3000–8000 mPa·s
Elongation at Break (cured)	30–60%

Aliphatic Urethane Acrylate UA-5200 (Flexible)

Specifications

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