Spandex manufacturers in South Korea are struggling to meet a sudden upsurge in demand for the fibre from foreign clients.. According to a report in the Korea Herald on Wednesday, spandex makers are working around the clock producing enough of the stretchy fabric to meet demand The country's largest spandex producer, Hyosung Co, was said to have made 600 tons of spandex for China - an increase of 200 per cent on the year-ago period.