Name: Epoxy Acrylate Oligomer EA-300 (Hard, Bisphenol-A based)
Brand: Coatingsink
SKU: epoxy-acrylate-ea300-hard
Availability: InStock

Question 1

Why does BPA-based epoxy acrylate produce a harder film compared to aliphatic urethane acrylates?

Accepted Answer

The rigid bisphenol-A aromatic backbone in EA-300 restricts chain mobility in the cured network, producing a glassy, high-Tg (80–100°C) film with excellent hardness and scratch resistance. Aliphatic urethane acrylates use flexible chain segments intentionally designed to lower Tg and increase elongation. EA-300 is therefore chosen for applications requiring maximum hardness, such as can varnishes and printing overcoats, rather than flexible or outdoor applications where yellowing of the aromatic system would be unacceptable.

Question 2

Is EA-300 suitable for food-contact packaging applications?

Accepted Answer

EA-300 can be used in UV varnishes for food-adjacent packaging, but full compliance depends on the complete formulation — including photoinitiator choice, reactive diluents, and cure conditions. The oligomer itself must be fully cured to minimize migration of unreacted species. Always validate the finished formulation against applicable food-contact regulations (e.g., EU 10/2011, FDA 21 CFR) before use on food-contact surfaces.

Tg (cured)	80–100°C (hard, glassy film)
Functionality	2
Color (Gardner)	≤3
Viscosity (60°C)	5000–15000 mPa·s
Chemical Resistance	excellent (solvents, acids)

Epoxy Acrylate Oligomer EA-300 (Hard, Bisphenol-A based)

Specifications

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