Diolen is essentially a polyester fibre and as such has a moderate temperature resistance. Its melting point is around 225°C with a short-term maximum service temperature of around 170°C. This means we would probably suggest a maximum sustained service temperature of around 150°C. Kevlar is considerably higher than this and carbon is considerably higher again; however - it's worth remembering that almost all of these temperatures exceed the maximum service temperature of most epoxies and so the resin matrix is much more likely to be the limiting factor in service temperature than the fibre.  We do have our EL160 high temperature epoxy which has a max service temperature of 160°C (Tg 170°C) which would be our recommended resin for this type of work, subject of course to the actual temperatures anticipated.