The solvents are usually highly flammable (hydrocarbons, esters or ketones) but are sometimes non-flammable chlorinated hydrocarbons. This risk assessment also covers paint strippers that use similar solvents.
All plastics (polymers) degrade at sufficiently high temperatures, producing fumes with various hazards. Those materials presenting hazards at lower temperatures are discussed here.
In any use of compliant materials (paper, dress and upholstery fabrics, etc) they may burn rapidly if accidentally ignited by a naked flame and the fumes and smoke produced, particularly from synthetic materials, may be an additional hazard.