Fabric or paper combined with phenolic resin (Bakelite) are the easiest to process. However, these materials may be somewhat limited in achieving fine tolerances. The water absorption capacity can in certain situations have a limiting effect on tolerances.
A combined material with glass mat and roving (longer glass fibers) provides improved mechanical properties. What you can choose is, for example, UPM S2.
Thermosetting plastic consisting of a glass mat combined with polyester resin (GPO3) provides good electrical insulation properties with in many applications acceptable mechanical properties.
Fiberglass laminates contain 40% – 60% glass, depending on how high mechanical and electrical properties are required.
Mica-based material (foil micanite) can be used at temperatures up to approx. 500° C. If the temperature requirements are even higher, Roburit can be used (approx. 800° C). This material is more brittle and flatness requirements on the substrate for fastenings are important to take into account.
Glass material with a fine weave combined with epoxy resin provides good mechanical properties. If you need properties at higher temperatures, fiberglass with polyimide resin is preferable.
The material passes the so-called The ‘glass transition’ temperature, Tg, and mechanical properties deteriorate. If the temperature gets high enough, the resin “boils off” and only the fiberglass remains.
Use a material with as fine a texture as possible, e.g. epoxy with ‘glass fabrics’
G10 and G11 are requirements that the materials meet according to the American standard Nema. The corresponding European standard is EPGC 308.
The Highest working temperature with maintained mechanical properties is achieved with glass fabric combined with polyimide resin. Polyimide can be used at temperatures up to approx. 250° C. Note, however, that mechanical properties decrease with increasing temperature.