Name: Cycloaliphatic Epoxy Resin ERL-3400 type
Brand: Coatingsink
SKU: cycloaliphatic-epoxy-resin-3400
Availability: InStock

Question 1

Why is cycloaliphatic epoxy resin preferred over BPA epoxy for UV-curable coatings?

Accepted Answer

Bisphenol-A (BPA) based epoxy resins contain aromatic groups that absorb UV radiation and undergo photo-oxidative degradation, causing yellowing and chalk in exterior applications. Cycloaliphatic epoxy resins (ERL-3400 type) are fully aliphatic and BPA-free, yielding excellent UV and weathering stability. They are also highly reactive under cationic UV cure conditions (with diaryliodonium or triarylsulfonium photoinitiators), enabling fast cure speeds on UV lines.

Question 2

Can ERL-3400 type resin be used in combination with bisphenol-A epoxy for electrical encapsulation?

Accepted Answer

Yes, blending cycloaliphatic epoxy (ERL-3400 type) with BPA epoxy (E-51) is a common formulation strategy for electrical encapsulation. The cycloaliphatic component improves weathering, arc resistance and low dielectric loss, while BPA epoxy contributes higher toughness and lower cost. Typical blend ratios are 20–50% cycloaliphatic to 50–80% BPA epoxy, cured with anhydride hardeners for electrical-grade systems.

Density	1.17 g/cm³
Color (APHA)	≤50
Viscosity (25°C)	400–900 mPa·s
UV/Weather Stability	excellent (no BPA)
Epoxide Equivalent Weight	130–143 g/eq

Cycloaliphatic Epoxy Resin ERL-3400 type

Specifications

FAQ

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