Patent ID: 8231835

Claim:
A mat product, comprising: a mat member including inorganic fibers and having a full length Lm; and a package member having a full length Lr, wherein the mat member is received in an inside space of the package member, the inside space of the package member is in gas-communication with an outside environment, and the full length Lr of the package member is greater than the full length Lm of the mat member and thereby the mat member can move in the inside space along a full length direction, wherein the inside space is in gas-communication with the outside environment via one or more opening parts which are provided in the package member and have a dimension in a range between approximately 0.1 mm through approximately 5.0 mm, wherein the mat member includes a first surface and a second surface situated at a side opposite to the first surface, the package member includes a first side facing the first surface and a second side facing the second surface, and outside surfaces of the first side and the second side of the package member have coefficients of friction substantially different from each other.