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A mounting mat for an exhaust gas treatment device includes first and second major opposite facing surfaces, leading and trailing edges, and opposite lateral edges. At least a portion of one or both of the opposite lateral edges includes an edge protectant that protects the mounting mat against eros

A mounting mat for an exhaust gas treatment device includes first and second major opposite facing surfaces, leading and trailing edges, and opposite lateral edges. At least a portion of one or both of the opposite lateral edges includes an edge protectant that protects the mounting mat against erosion from hot gases encountered during the normal operation of the exhaust gas treatment device. The edge protectant remains flexible after it has been applied to the mounting mat and substantially dried. Also disclosed is an exhaust gas treatment device that includes a housing and a fragile structure mounted within the housing by the mounting mat having the edge protectant deposited thereon. Additionally disclosed are methods of making the mounting mat and an exhaust gas treatment device.

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1. A mounting mat for an exhaust gas treatment device comprising a mat of inorganic fibers comprising first and second major opposite facing surfaces, leading and trailing edges, and opposite lateral edges, wherein at least a portion of at least one of said opposite lateral edges includes a substant

1. A mounting mat for an exhaust gas treatment device comprising a mat of inorganic fibers comprising first and second major opposite facing surfaces, leading and trailing edges, and opposite lateral edges, wherein at least a portion of at least one of said opposite lateral edges includes a substantially dry flexible edge protectant comprising a substantially non-crosslinkable polymer that thermally decomposes leaving a gas erosion resisting agent adsorbed on the mounting mat. 2. The mounting mat of claim 1, wherein said mat comprises at least one of organic binder and inorganic binder. 3. The mounting mat of claim 1, wherein said inorganic fibers are selected from the group consisting of high alumina polycrystalline fibers, refractory ceramic fibers, glass fibers, biosoluble fibers, quartz fibers, silica fibers, and combinations thereof. 4. The mounting mat of claim 3, wherein said ceramic fibers comprise alumino-silicate fibers comprising the fiberization product of about 45 to about 75 weight percent alumina and about 25 to about 55 weight percent silica. 5. The mounting mat of claim 3, wherein said biosoluble fibers comprise the fiberization product of about 65 to about 86 weight percent silica and from about 14 to about 35 weight percent magnesia. 6. The mounting mat of claim 3, wherein the biosoluble fibers comprise the fiberization product of about 45 to about 90 weight percent silica, greater than 0 to about 45 weight percent calcia, and greater than 0 to about 35 weight percent magnesia. 7. The mounting mat of claim 1, wherein said flexible edge protectant comprises a water based non-crosslinkable silicone emulsion. 8. The mounting mat of claim 7, wherein said edge protectant further comprises a surfactant. 9. The mounting mat of claim 1, wherein said gas erosion resisting agent comprises an inorganic particulate. 10. The mounting mat of claim 9, wherein said inorganic particulate comprises alumina, silica, zirconia, and mixtures thereof. 11. The mounting mat of claim 10, wherein said inorganic particulate comprises silica. 12. The mounting mat of claim 11, wherein the particle size of the inorganic particulate is from about 5 to about 100 nanometers. 13. The mounting mat of claim 1, wherein said mat comprises an intumescent material selected from the group consisting of unexpanded vermiculite, ion exchanged vermiculite, heat treated vermiculite, expandable graphite, hydrobiotite, water-swelling tetrasilicic fluorine mica, alkaline metal silicates, or mixtures thereof. 14. The mounting mat of claim 1, wherein said mat comprises a clay selected from the group consisting of attapulgite, ball clay, bentonite, hectorite, kyanite, kaolinite, montmorillonite, palygorskite, saponite, sepiolite, silimanite and combinations thereof. 15. An exhaust gas treatment device comprising: a housing;a mat of inorganic fibers comprising first and second major opposite facing surfaces, leading and trailing edges, and opposite lateral edges, wherein at least a portion of at least one of said opposite lateral edges includes a substantially dry flexible edge protectant comprising a substantially non-crosslinkable polymer that thermally decomposes leaving a gas erosion resisting agent adsorbed on the mounting mat; anda fragile catalyst support structure resiliently mounted within said housing by said mounting mat. 16. The exhaust gas treatment device of claim 15, wherein said housing has an inlet at one end and an outlet at an opposite end through which exhaust gases flow; and wherein said catalyst support structure has an outer surface, an inlet end surface at one end in communication with said inlet of said housing and an outlet end surface at an opposite end in communication with said outlet end of said housing. 17. The exhaust gas treatment device of claim 15, wherein said inorganic fibers are selected from the group consisting of high alumina polycrystalline fibers, refractory ceramic fibers, glass fibers, biosoluble fibers, quartz fibers, silica fibers, and combinations thereof. 18. The exhaust gas treatment device of claim 17, wherein said ceramic fibers comprise alumino-silicate fibers comprising the fiberization product of about 45 to about 75 weight percent alumina and about 25 to about 55 weight percent silica. 19. The exhaust gas treatment device of claim 17, wherein said biosoluble fibers comprise the fiberization product of about 65 to about 86 weight percent silica and from about 14 to about 35 weight percent magnesia. 20. The exhaust gas treatment device of claim 17, wherein the biosoluble fibers comprise the fiberization product of about 45 to about 90 weight percent silica, greater than 0 to about 45 weight percent calcia, and greater than 0 to about 35 weight percent magnesia. 21. The exhaust gas treatment device of claim 15, wherein said flexible edge protectant comprises a water based non-crosslinkable silicone emulsion. 22. The exhaust gas treatment device of claim 21, wherein said edge protectant further comprises a surfactant. 23. The exhaust gas treatment device of claim 15, wherein said gas erosion resisting agent comprises an inorganic particulate. 24. The exhaust gas treatment device of claim 23, wherein said inorganic particulate comprises silica. 25. The exhaust gas treatment device of claim 24, wherein the particle size of the inorganic particulate is from about 5 to about 100 nanometers. 26. The exhaust gas treatment device of claim 15, wherein said mounting mat comprises an intumescent material selected from the group consisting of unexpanded vermiculite, ion exchanged vermiculite, heat treated vermiculite, expandable graphite, hydrobiotite, water-swelling tetrasilicic fluorine mica, alkaline metal silicates, or mixtures thereof. 27. The exhaust gas treatment device of claim 15, wherein said mounting mat comprises a clay selected from the group consisting of attapulgite, ball clay, bentonite, hectorite, kyanite, kaolinite, montmorillonite, palygorskite, saponite, sepiolite, silimanite or combinations thereof. 28. The exhaust gas treatment device of claim 15, wherein the device is a catalytic converter, diesel particulate trap, or a NOx trap. 29. A mounting mat for an exhaust gas treatment device comprising a mat of inorganic fibers comprising first and second major opposite facing surfaces, leading and trailing edges, and opposite lateral edges, wherein at least a portion of at least one of said opposite lateral edges includes a substantially dry flexible edge protectant comprising a substantially non-crosslinkable polymer and a gas erosion resisting agent adsorbed on the mounting mat. 30. The mounting mat of claim 29, wherein said mat comprises at least one of organic binder and inorganic binder. 31. The mounting mat of claim 29, wherein said inorganic fibers are selected from the group consisting of high alumina polycrystalline fibers, refractory ceramic fibers, glass fibers, biosoluble fibers, quartz fibers, silica fibers, and combinations thereof. 32. The mounting mat of claim 29, wherein said ceramic fibers comprise alumino-silicate fibers comprising the fiberization product of about 45 to about 75 weight percent alumina and about 25 to about 55 weight percent silica. 33. The mounting mat of claim 29, wherein said biosoluble fibers comprise the fiberization product of about 65 to about 86 weight percent silica and from about 14 to about 35 weight percent magnesia. 34. The mounting mat of claim 29, wherein the biosoluble fibers comprise the fiberization product of about 45 to about 90 weight percent silica, greater than 0 to about 45 weight percent calcia, and greater than 0 to about 35 weight percent magnesia. 35. The mounting mat of claim 29, wherein said flexible edge protectant comprises a water based non-crosslinkable silicone emulsion. 36. The mounting mat of claim 35, wherein said edge protectant further comprises a surfactant. 37. The mounting mat of claim 29, wherein said gas erosion resisting agent comprises an inorganic particulate. 38. The mounting mat of claim 37, wherein said inorganic particulate comprises alumina, silica, zirconia, and mixtures thereof. 39. The mounting mat of claim 38, wherein said inorganic particulate comprises silica. 40. The mounting mat of claim 39, wherein the particle size of the inorganic particulate is from about 5 to about 100 nanometers. 41. The mounting mat of claim 29, wherein said mat comprises an intumescent material selected from the group consisting of unexpanded vermiculite, ion exchanged vermiculite, heat treated vermiculite, expandable graphite, hydrobiotite, water-swelling tetrasilicic fluorine mica, alkaline metal silicates, or mixtures thereof. 42. The mounting mat of claim 29, wherein said mat comprises a clay selected from the group consisting of attapulgite, ball clay, bentonite, hectorite, kyanite, kaolinite, montmorillonite, palygorskite, saponite, sepiolite, silimanite and combinations thereof. 43. An exhaust gas treatment device comprising: a housing;a mat of inorganic fibers comprising first and second major opposite facing surfaces, leading and trailing edges, and opposite lateral edges, wherein at least a portion of at least one of said opposite lateral edges includes a substantially dry flexible edge protectant comprising a substantially non-crosslinkable polymer and a gas erosion resisting agent adsorbed on the mounting mat; anda fragile catalyst support structure resiliently mounted within said housing by said mounting mat. 44. The exhaust gas treatment device of claim 43, wherein said housing has an inlet at one end and an outlet at an opposite end through which exhaust gases flow; and wherein said catalyst support structure has an outer surface, an inlet end surface at one end in communication with said inlet of said housing and an outlet end surface at an opposite end in communication with said outlet end of said housing. 45. The exhaust gas treatment device of claim 43, wherein said inorganic fibers are selected from the group consisting of high alumina polycrystalline fibers, refractory ceramic fibers, glass fibers, biosoluble fibers, quartz fibers, silica fibers, and combinations thereof. 46. The exhaust gas treatment device of claim 45, wherein said ceramic fibers comprise alumino-silicate fibers comprising the fiberization product of about 45 to about 75 weight percent alumina and about 25 to about 55 weight percent silica. 47. The exhaust gas treatment device of claim 45, wherein said biosoluble fibers comprise the fiberization product of about 65 to about 86 weight percent silica and from about 14 to about 35 weight percent magnesia. 48. The exhaust gas treatment device of claim 45, wherein the biosoluble fibers comprise the fiberization product of about 45 to about 90 weight percent silica, greater than 0 to about 45 weight percent calcia, and greater than 0 to about 35 weight percent magnesia. 49. The exhaust gas treatment device of claim 43, wherein said flexible edge protectant comprises a water based non-crosslinkable silicone emulsion. 50. The exhaust gas treatment device of claim 49, wherein said edge protectant further comprises a surfactant. 51. The exhaust gas treatment device of claim 43, wherein said gas erosion resisting agent comprises an inorganic particulate. 52. The exhaust gas treatment device of claim 51, wherein said inorganic particulate comprises silica. 53. The exhaust gas treatment device of claim 52, wherein the particle size of the inorganic particulate is from about 5 to about 100 nanometers. 54. The exhaust gas treatment device of claim 43, wherein said mounting mat comprises an intumescent material selected from the group consisting of unexpanded vermiculite, ion exchanged vermiculite, heat treated vermiculite, expandable graphite, hydrobiotite, water-swelling tetrasilicic fluorine mica, alkaline metal silicates, or mixtures thereof. 55. The exhaust gas treatment device of claim 43, wherein said mounting mat comprises a clay selected from the group consisting of attapulgite, ball clay, bentonite, hectorite, kyanite, kaolinite, montmorillonite, palygorskite, saponite, sepiolite, silimanite or combinations thereof. 56. The exhaust gas treatment device of claim 43, wherein the device is a catalytic converter, diesel particulate trap, or a NOx trap. 57. A method of making a mat for an exhaust gas treatment device or exhaust gas conduit comprising: applying a liquid flexible edge protectant comprising either (i) a substantially non-crosslinkable polymer that decomposes to leave a gas erosion resisting agent adsorbed on the mat or (ii) a substantially non-crosslinkable polymer and gas erosion resisting agent to at least a portion of at least one edge of the mat comprising inorganic fibers; andremoving at least a portion of said liquid from said edge protectant. 58. The method of claim 57, wherein said removing said liquid comprises substantially drying at ambient temperature. 59. The method of claim 57, wherein said removing of said liquid comprises substantially drying by heating said mounting mat. 60. The method of claim 59, wherein said heating comprising heating said mat in a convection oven at a temperature from about 100 to about 200 degrees Celsius. 61. The method of claim 60, wherein selective heating is used to control the areas of deposition of said edge protectant on said mounting mat. 62. The method of claim 57, wherein said removing of said liquid comprises substantially drying by radio-frequency heating said mounting mat. 63. The method of claim 57, wherein after said removing of said liquid the moisture content of the edge protectant is about 10 percent of the original moisture content of the edge protectant. 64. The method of claim 63, wherein after said removing of said liquid the moisture content of the edge protectant is about 5 percent of the original moisture content of the edge protectant. 65. The method of claim 64, wherein after said removing of said liquid the moisture content of the edge protectant is about 2 percent of the original moisture content of the edge protectant.