1.1 ,This specification covers the types and physical properties of spray applied rigid cellular polyurethane intended for use as thermal insulation. The operating temperatures of the surfaces to which the insulation is applied shall not be lower than ,−,22°,F (−,30°,C) or greater than ,+225°,F (+107°,C). For specific applications, the actual temperature limits shall be as agreed upon between the manufacturer and the purchaser.