This part of ISO 13784 specifies a test method for evaluating the reaction-to-fire performance of sandwich panel building systems for small rooms and the resulting flame spread on or within the sandwich panel building construction when it is exposed to heat from a simulated internal fire with flames impinging directly on its internal corner. The test method is not intended for evaluating a product's fire resistance. This part of ISO 13784 is applicable to both freestanding and self-supporting, and frame-supported, sandwich panel systems. It is not applicable to sandwich panel products that are glued, nailed, bonded or similarly supported by an underlying wall or ceiling construction. NOTE Because of their design, some systems might be unsuitable for testing using this part of ISO 13784. Nevertheless, such systems could be suitable for testing using ISO 13784-2, in which case the field of application of the test report might be restricted. For testing of products used as internal linings, see ISO 9705.