Haydale Graphene Industries on Monday began trading on AIM.The group, which provides technology for the commercialisation of grapheme, raised £6.6m before expenses through a placement of more than 3.14m new ordinary shares at a placing price of 210p per share.On admission, the company has more than 11.24m ordinary shares in issue with a market capitalisation of £23.62m.Proceeds of the initial public offering will be used to expand engineering, production, technical and business development teams to support product development. RD