MILLIONS of dollars are being lost every year because Hong Kong companies are not recycling their high grade plastics efficiently, an environmental survey has found. ''We estimate that at least 400 tonnes of high quality engineering plastic goes into local landfills every year,'' said Wee Ling Ooi, manager for education and research with the Private Sector Committee for the Environment. ''And we predict that in future the problem will get a lot worse. Plastic is designed to last for years. All of this seems so unnecessary and damaging to the environment.'' Ms Ooi, who worked on the six-month survey of 75 plastics companies, said if Hong Kong firms adopted recycling techniques currently used in Japan, the US and Germany, they could recoup a substantial proportion of the more than $10 million currently beinglost per year.