These disclosed embodiments relates to a device for fixing a light-weight panel onto a support. The first spaced features have elevationally outermost regions which are different in composition from elevationally outermost regions of the second spaced features. The life of the injector, and thus the length of any single gasification campaign, is thereby extended. The sliding rails are disposed at the body, extend along the embedding direction, and are respectively located at two opposite sides of the opening.