ULC CAN/ULC 743.1:2020 (R2025) Standard for Thermal Insulation – Low Pressure Applied Two Component Spray Polyurethane Foam, Part 1: Material Specification

PREFACE

This is the First Edition of the Standard for Thermal Insulation – Low Pressure Applied Two Component Spray Polyurethane Foam, Part 1: Material Specification, CAN/ULC 743.1.

This Edition of the Standard has been developed by the ULC Standards Task Group on Thermal Performance And Energy Use In The Built Environment.

This Standard has been developed in compliance with the requirements of SCC for accreditation of a Standards Development Organization.

Only metric SI units of measurement are used in this Standard. If a value for measurement is followed by a value in other units in parentheses, the second value may be approximate. The first stated value is the requirement.

Annex A, identified as informative, is for information purposes only.

In Canada, there are two official languages, English and French. All safety warnings must be in French and English. Attention is drawn to the possibility that some Canadian authorities may require additional markings and/or installation instructions to be in both official languages.

Attention is drawn to the possibility that some of the elements of this Canadian standard may be the subject of patent rights. ULC Standards shall not be held responsible for identifying any or all such patent rights.

Requests for interpretation of this Standard should be sent to ULC Standards. The requests should be worded in such a manner as to permit a “yes” or “no” answer based on the literal text of the requirement concerned.

This CAN/ULC 743.1 Standard is under continuous maintenance, whereby each revision is approved in compliance with the requirements of SCC for accreditation of a Standards Development Organization. In the event that no revisions are issued for a period of four years from the date of publication, action to revise, reaffirm, or withdraw the standard shall be initiated.

Comments or proposals for revisions on any part of the Standard may be submitted at any time. Proposals should be submitted via a Proposal Request in the Collaborative Standards Development System (CSDS) at https://csds.ul.com.

This Standard is intended to be used for conformity assessment.

1 Scope

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.