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Former business development manager of Castle Cement, Philip Jones, has set up his own company to market the four-product range of concrete additives formerly sold by Castle Building Products.Mr Jones decided to go it alone after Castle announced that it was going to concentrate on its core product, cement.Philip Jones Construction Materials, which Mr Jones runs with his wife, is now the sole UK supplier of Micropoz, a condensed silica fume for use in concrete, Corrocem, an anti-corrosion concrete additive, Hydrocem, an underwater additive, and Harex steel fibres for concrete reinforcement.Mr Jones has been operating independently since March and reports that business is buoyant.'The potential for these products is enormous,' he says. 'I know what the market is, and I reckon that our penetration at the moment is only about 10 per cent.'The company is operating temporarily from an office at Castle's works at Mold, Clwyd.Mr Jones became Castle's business development manager in 1989 after the company's acquisition the year before by the Scandinavian joint venture companies, Aker and Euroc.Previously sales manager with Tunnel Cement (now integrated into Castle), Mr Jones was given the task of diversifying the company's activities at the height of the UK construction boom.'I spent a lot of 1989 going to and from Scandinavia negotiating the new product ranges,' says Mr Jones.The four products are made in Norway by Scancem International, part of the Aker group, and are sold throughout the world.Although he is confident, Mr Jones says that his is a daunting task.'It's an added-value product, not one that's going to be sold every hour of every day.'I've got to convince everybody down the line - specifiers, contractors, cement producers. That's what I've been doing for four years already, and now it's beginning to bear fruit.' CONSTRUCTION NEWS