Source Temperature-Resistant Plastics

My next consumer-product line needs plastic components that can shrug off high operating temperatures without warping, cracking, or losing appearance. I already ruled out metals and composites for cost... (Budget: ₹600 - ₹1500 INR, Jobs: CAD/CAM, Chemical Engineering, Manufacturing Design, Materials Engineering, Mechanical Engineering, Product Development, Sourcing, Supplier Sourcing)