Vesuvius Plastic Refractory Monolithic Insulating Refractory 2900 Degree FVesuvius Super duty class air bond plastic refractory. Evolving from the original plastic material pioneered in the early 20th century, this material is field tested and has withstood the test of time. Economical with great workability, this workhorse can be used for a wide variety of applications. Product attributes include: Contains an air bonding agent for better low temperature strength and shrinkage control Typical usage: Repairs to boiler