MULTILAYERED SHEET

This invention pertains to a layered sheet comprising a flame resistant wet-laid nonwoven carrier having a first and second surface and an inorganic refractory layer adjacent to at least one surface of the carrier wherein the refractory layer has a dry areal weight of from 15 to 50 gsm， the bond strength between the refractory layer and the surface of the carrier is at least 0.25 lb/in， wherein the carrier comprises from 40 to 70 weight percent of aramid fibers and from 30 to 60 weight percent of polymeric binder， is hydrophilic， has a smoothness on at least one surface of no less than 250 Sheffield units， a thickness of from 0.025 to 0.175 mm and a density of from 0.25 to 0.60 g/cc. Preferably the carrier is in the form of a paper. This invention pertains to a layered sheet comprising a flame resistant wet-laid nonwoven carrier having a first and second surface and an inorganic refractory layer adjacent to at least one surface of the carrier wherein the refractory layer has a dry areal weight of from 15 to 50 gsm， the bond strength between the refractory layer and the surface of the carrier is at least 0.25 lb/in， wherein the carrier comprises from 40 to 70 weight percent of aramid fibers and from 30 to 60 weight percent of polymeric binder， is hydrophilic， has a smoothness on at least one surface of no less than 250 Sheffield units， a thickness of from 0.025 to 0.175 mm and a density of from 0.25 to 0.60 g/cc. Preferably the carrier is in the form of a paper.