Disclosed is a ceramic matrix composite (CMC) material including rare earth phosphate ceramic fibers embedded in a ceramic matrix, wherein the ceramic matrix also optionally includes a rare earth phosphate material. Methods for manufacturing the CMC material and gas turbine engine components formed of the CMC material are also disclosed.

Fibers sized with a coating of amorphous polyetherketoneketone are useful in the preparation of reinforced polymers having improved properties, wherein the amorphous polyetherketoneketone can improve the compatibility of the fibers with the polymeric matrix.

A resin composition for a printed wiring board containing a cyanate compound (A); a maleimide compound (B); and a benzoguanamine compound (C) having an aminomethyl group represented by the following general formula (1): ##STR00001##
wherein R is a hydrogen atom or a substituent selected from a group consisting of a hydrocarbon group having 1 to 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, an aryloxy group having 6 to 10 carbon atoms, a hydroxyl group, an amide group, and a halogen atom, and n is an integer of 1 to 2.

The object is to provide a resin composition for a printed circuit board capable of realizing a printed circuit board that not only has heat resistance and flame retardancy but also is excellent in heat resistance after moisture absorption. The resin composition is a resin composition for a printed circuit board containing a cyanate ester compound (A) obtained by cyanation of a naphthol-dihydroxynaphthalene aralkyl resin or a dihydroxynaphthalene aralkyl resin, and an epoxy resin (B).

A fibre structure formed from dissolvable glass fibres is provided, the dissolvable glass fibres being formed from one or more boron compounds and one or more alkali compounds. The dissolvable glass can be formed into filaments, rovings and staple fibres of varying composition, length and diameter dependent on functionality and purpose. A mixture of chemicals components are heated, melted and then drawn or extruded into dissolvable filaments, rovings and staple fibres for use in a fibre-reinforced composite part or as a preservative in the internal and surface treatment of solid wood and engineered composite panels. A water-soluble surface coating may be applied to adjust dissolution rate and facilitate binding into an air-laid nonwoven mat or incorporation into other matrices.

An object of the present disclosure is to provide a filter medium for an air filter which does not contain a PFAS nor a siloxane compound and has a good physical property balance among the PF value, the water repellency, and the strength. A filter medium for an air filter according to the present disclosure is a filter medium for an air filter composed of a wet-laid nonwoven fabric, wherein the filter medium for an air filter contains a binder resin and a water repellent, the water repellent contains, as a main component, a hydrocarbon-based polymer free of fluorine and silicon in a molecule thereof, and the binder resin and the water repellent are crosslinked by an isocyanate crosslinking component.

[Object] Provided are inorganic fibers or inorganic flakes having excellent neutron shielding properties.

[Solution] When a formulation including: a base component containing SiO.sub.2 and Al.sub.2O.sub.3 as main components (provided that the mass ratio occupied by the sum total of SiO.sub.2 and Al.sub.2O.sub.3 in the base component is 0.60 or more); and a neutron shielding component composed of at least one of gadolinium, gadolinium oxide, samarium, samarium oxide, cadmium, or cadmium oxide, are blended at the proportions of 50 to 90 parts by mass of the base component and 10 to 50 parts by mass of the neutron shielding component and melted, satisfactory amorphous inorganic fibers and inorganic flakes were obtained.

Fibers sized with a coating of amorphous polyetherketoneketone are useful in the preparation of reinforced polymers having improved properties, wherein the amorphous polyetherketoneketone can improve the compatibility of the fibers with the polymeric matrix.

A non-woven fiber mat for lead-acid batteries is provided. The non-woven fiber mat includes glass fibers coated with a sizing composition, a binder composition, and organic active compounds, wherein the organic active compounds are effective in reducing or preventing sulphation in lead-acid batteries.

Fibers sized with a coating of amorphous polyetherketoneketone are useful in the preparation of reinforced polymers having improved properties, wherein the amorphous polyetherketoneketone can improve the compatibility of the fibers with the polymeric matrix.