CAN/ULC-S743.1:2020

1.1 This document specifies the physical property requirements and test methods used to verify compliance of those material properties for low pressure spray applied rigid two-component polyurethane foam for use as thermal insulation. This document applies to materials for building applications whether applied on a building site or in a prefabrication (manufacturing) process. 1.2 The spray polyurethane foam system supplier does not produce the material for which this document specifies physical properties. The spray polyurethane foam system supplier produces a liquid resin component and supplies the corresponding polymeric isocyanate. When mixed together during installation, on a fixed ratio basis, these two components produce the material. 1.3 The components are dispensed at pressures of no more than 2,075 kPa (300 psi). 1.4 The material shall not be used when the continuous service temperature of the substrate is outside the range of -60 to +80°C. 1.5 The test methods used to determine the material properties provide a means of comparing different materials. They are intended for use in specifications, product evaluations and quality control. 1.6 CAN/ULC-S743.2 includes mandatory requirements for the installation of the material as well as the requirements of contractors and the qualification of installers. The requirements in CAN/ULC-S743.2 form an integral part of the manufacturing process for the finished product. The product, when produced on site in accordance with CAN/ULC-S743.2, ensures that the material meets the requirements of this document. 1.7 This document does not purport to address all the health and safety aspects associated with its use. Anyone using this document has the responsibility to consult the appropriate authorities and to establish appropriate health and safety practices in conjunction with any existing applicable regulatory requirements prior to its use.