Nomacorc, the synthetic closure manufacturer, has announced 'record sales' for the first half of 2011 - while the natural cork industry is equally positive.It has posted 10% year-on-year growth for the first two quarters of 2011, adding to ‘double digit growth in ten out of the last 11 years,’ Nomacorc says. According to Nielsen, the US company supplies closures for 51% of the top 100 wines sold by volume in the US, with an overall market share of 40%.