A cover window includes a glass fiber composite layer including a first glass fiber layer and a first glass disposed on a first surface of the glass fiber composite layer. The first glass fiber layer includes unidirectional glass fibers apart from each other and each extending in a first direction, and a modulus of the first glass fiber layer in the first direction is greater than a modulus of the first glass fiber layer in a second direction perpendicular to the first direction.

A fiberglass reinforced aerogel composite may include coarse glass fibers, glass microfibers, aerogel particles, and a binder. The coarse glass fibers may have an average fiber diameter between about 8 μm and about 20 μm. The glass microfibers may have an average fiber diameter between about 0.5 μm and about 3 μm. The glass microfibers may be homogenously dispersed within the coarse glass fibers. The aerogel particles may be homogenously dispersed within the coarse glass fibers and the glass microfibers. The fiberglass reinforced aerogel composite may include between about 50 wt. % and about 75 wt. % of the aerogel particles. The binder bonds the coarse glass fibers, the glass microfibers, and the aerogel particles together.

A fiberglass reinforced aerogel composite may include coarse glass fibers, glass microfibers, aerogel particles, and a binder. The coarse glass fibers may have an average fiber diameter between about 8 μm and about 20 μm. The glass microfibers may have an average fiber diameter between about 0.5 μm and about 3 μm. The glass microfibers may be homogenously dispersed within the coarse glass fibers. The aerogel particles may be homogenously dispersed within the coarse glass fibers and the glass microfibers. The fiberglass reinforced aerogel composite may include between about 50 wt. % and about 75 wt. % of the aerogel particles. The binder bonds the coarse glass fibers, the glass microfibers, and the aerogel particles together.

External thermal insulation composite systems described herein include a concrete or masonry wall and a thermal insulation board on the concrete or masonry wall. The thermal insulation board includes a polyurethane/polyisocyanurate foam having a density of less than 70 kg/m.sup.3 according to ASTM D 1622. Methods of preparing the external thermal insulation composite systems and the thermal insulation boards are also described.

External thermal insulation composite systems described herein include a concrete or masonry wall and a thermal insulation board on the concrete or masonry wall. The thermal insulation board includes a polyurethane/polyisocyanurate foam having a density of less than 70 kg/m.sup.3 according to ASTM D 1622. Methods of preparing the external thermal insulation composite systems and the thermal insulation boards are also described.

The invention relates to a method for producing a shapable core (10) from a rigid panel (12), the plane of the panel being defined by the axes X and Y and the height H being oriented in the direction Z of an orthonormal reference frame, for producing composite material products, consisting in cutting the panel (12) to form core elements (16). According to the invention, the method consists in making the cuts (14, 34) along the axis Z, producing hooking means (17) on each of the core elements (16) cut in this way, so as to allow the core elements (16) to be connected to each other and to produce a hinge connection (22) with retention between the core elements (16) in the plane XY.

Disclosed herein are compounds of formulas (I) and (II), Wherein R.sub.1, R.sub.2, R.sub.3 and (1) are as described herein. Methods of making compounds of formulas (I) and (II), curable compositions containing them and cured compositions containing them are also described. The compounds of formulas (I) and II are curing agents, fire retardants or both. ##STR00001##

Disclosed herein are compounds of formulas (I) and (II), Wherein R.sub.1, R.sub.2, R.sub.3 and (1) are as described herein. Methods of making compounds of formulas (I) and (II), curable compositions containing them and cured compositions containing them are also described. The compounds of formulas (I) and II are curing agents, fire retardants or both. ##STR00001##

A multilayer radar-absorbing laminate includes three juxtaposed blocks. A first electrically conductive block is arranged toward the inside of the aircraft in use. A second electromagnetic intermediate absorber block has a layer of electrically non-conductive fiber sheets is permeated by graphene-based nanoplatelets to achieve a periodic and electromagnetically subresonant layer, the conductive layers containing graphene nanoplatelets alternating with non-conductive layers. A third block of electrically non-conductive material is arranged towards the outside and forms part of the outer surface of the aircraft. The second block is produced by depositing on the fiber sheets a suspension of graphene nanoplatelets in a polymeric mixture, with controlled penetration of the graphene nanoplatelets into the fiber sheets. A plurality of dry fiber sheets sprayed with the suspension of graphene nanoplatelets is superimposed. An unpolymerized thermosetting synthetic resin is infused into a lay-up made of the first, second and third blocks. Afterwards, the thermosetting resin is polymerized.

A multilayer radar-absorbing laminate includes three juxtaposed blocks. A first electrically conductive block is arranged toward the inside of the aircraft in use. A second electromagnetic intermediate absorber block has a layer of electrically non-conductive fiber sheets is permeated by graphene-based nanoplatelets to achieve a periodic and electromagnetically subresonant layer, the conductive layers containing graphene nanoplatelets alternating with non-conductive layers. A third block of electrically non-conductive material is arranged towards the outside and forms part of the outer surface of the aircraft. The second block is produced by depositing on the fiber sheets a suspension of graphene nanoplatelets in a polymeric mixture, with controlled penetration of the graphene nanoplatelets into the fiber sheets. A plurality of dry fiber sheets sprayed with the suspension of graphene nanoplatelets is superimposed. An unpolymerized thermosetting synthetic resin is infused into a lay-up made of the first, second and third blocks. Afterwards, the thermosetting resin is polymerized.