One of Asia's biggest polyester makers, Far Eastern Textile, has revealed a fall in revenue for last month. May revenue of NT$2.74bn was down 8.3 per cent from NT$2.99bn in May last year.   But it may just be a temporary blip as revenue in the first five months of the year was NT$13.62bn, up 2.6 per cent from NT$13.27bn in the same period last year.