It's probably a little late, but the factory Hyundai Long Life coolant is part number 00232-19010.
Cross-referencing this part number here:
Beck/Arnley Genuine OE Fluids, I'm led to believe that Hyundai fluid is hybrid organic acid chemistry, and is silicate-free. While it is green, it is probably closer in chemistry to the hybrid organic acid coolants used by other Asian manufacturers (such as Toyota pink and Honda blue coolant) than it is to traditional domestic green coolant. Traditional green coolant contains silicates, which most Asian manufacturers don't typically recommend. Hyundai doesn't call out silicates either way, but many Asian manufacturers do, and I believe the OEM coolant does not use silicates.