Neopentyl Glycol Diacrylate (NPGDA)

NPGDA is difunctional, meaning it participates in crosslinking during UV cure rather than simply acting as a solvent that evaporates. This contributes to the cured network's mechanical strength and chemical resistance, unlike monofunctional diluents which can act as chain terminators and reduce crosslink density. Its low viscosity (8–12 mPa·s) also makes it highly effective at thinning high-viscosity oligomers without large loading requirements.