Which fibre reinforced laminates are preferred when manufacturing small items?

Use the material with the most delicate weave, e.g. epoxy with glass fabrics.

What is the high temperature limit for fibre glass reinforced laminates?

The highest working temperature with maintained mechanical properties is achieved with a combination of glass weave and polyimide resin. Polyimide can be used up to approx. 250º C, however, the mechanical properties decline with increasing temperature.

What kind of material should be used to achieve the best mechanical properties possible?

Glass material with delicate weave, combined with epoxy resin gives you good mechanical properties. If you need these in a higher temperature range, fibreglass fabric with polyimide resin should be preferred.