This part of IEC 60794-1 defines test procedures to be used in establishing uniform requirements for the environmental performance of microduct. The test determines the capability of the microduct to withstand internal pressure without leakage and visible damage. This document applies to microduct used for installation of microduct cable or fibre unit by blowing. Throughout this document, the wording "microduct" can also include protected microduct(s). See IEC 60794-1-2 for a reference guide to test methods of all types and for general requirements and definitions.