Hi, And there was me asking a perfectly sensible question !!!!! Cheers, Roger Mason, in St. Agnes. The Sheppard Residence wrote: >Ask people who make kitchen worktops, they form mica <vbg> > >Cheers > >Peter > > > > > MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.