This International Standard specifies a method of testing the continuous wave (cw) laser resistance of all parts of the cuff region of a tracheal tube and is applicable to tracheal tubes which are designed to resist ignition by a laser. Other components of the system, such as the inflation system and shaft (as defined in Part 1 of this International Standard), are outside the scope of this International Standard. NOTE 1 The method for testing the laser resistance of the tracheal tube shaft is in the scope of ISO 11990, which will become Part 1 of this International Standard. The specified test method shall be used to measure and describe the properties of materials, products or assemblies in response to heat and flame under controlled laboratory conditions. It does not apply to describe or appraise the fire hazard or fire risk of materials, products, or assemblies under actual fire conditions. However, results of this test may be used as an element of a fire risk assessment which takes into account all of the factors which are pertinent to an assessment of the hazard of a particular end use. NOTE 2 Caution should be observed in interpreting these results, since the direct applicability of the result of this test method to the clinical situation has not been fully established. NOTE 3 This test method may involve hazardous materials, operations, and equipment. This International Standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this test method to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.