Laminate structure suitable as electrical insulation comprising a mica-aramid layer of 35-55 wt % mica, 20-60 wt % binder, and 5 to 25 wt % aramid floc, the mica distributed uniformly in the mica-aramid layer; and an aramid layer comprising 35-75 wt % binder and 25-65 wt % aramid floc, the aramid layer being essentially free of mica; wherein the mica-aramid layer has a limiting oxygen index (LOI) of 37% or greater, and the aramid layer has a LOI of 30% or less and having a tensile strength and elongation greater than the mica-aramid layer; and the mica-aramid layer being homogeneously and continuously bound to the aramid layer; the laminate structure having a thickness of at least 0.10 mm, a LOI greater than 32%, and when exposed to a flame to determine LOI, the laminate burns as one piece.

Laminate structure suitable as electrical insulation comprising a mica-aramid layer of 35-55 wt % mica, 20-60 wt % binder, and 5 to 25 wt % aramid floc, the mica distributed uniformly in the mica-aramid layer; and an aramid layer comprising 35-75 wt % binder and 25-65 wt % aramid floc, the aramid layer being essentially free of mica; wherein the mica-aramid layer has a limiting oxygen index (LOI) of 37% or greater, and the aramid layer has a LOI of 30% or less and having a tensile strength and elongation greater than the mica-aramid layer; and the mica-aramid layer being homogeneously and continuously bound to the aramid layer; the laminate structure having a thickness of at least 0.10 mm, a LOI greater than 32%, and when exposed to a flame to determine LOI, the laminate burns as one piece.

An acoustical tile including: 8 to 25 wt % mineral wool, 9 to 15 wt % starch binder, 9 to 15 wt % cellulosic fiber, wherein preferably the cellulosic fiber is newsprint, and 40 to 65 wt % perlite, wherein the weight ratio of the starch to the cellulosic fiber is 0.6 to 1.3:1; and a process for making the acoustical tile.

An acoustical tile including: 8 to 25 wt % mineral wool, 9 to 15 wt % starch binder, 9 to 15 wt % cellulosic fiber, wherein preferably the cellulosic fiber is newsprint, and 40 to 65 wt % perlite, wherein the weight ratio of the starch to the cellulosic fiber is 0.6 to 1.3:1; and a process for making the acoustical tile.

An acoustical tile including: 8 to 25 wt % mineral wool, 9 to 15 wt % starch binder, 9 to 15 wt % cellulosic fiber, wherein preferably the cellulosic fiber is newsprint, and 40 to 65 wt % perlite, wherein the weight ratio of the starch to the cellulosic fiber is 0.6 to 1.3:1; and a process for making the acoustical tile.