Abstract: The invention provides a heat resistant insulation composite comprising an insulation base layer comprising hollow, non-porous particles and a matrix binder, and a thermally reflective layer comprising a protective binder and an infrared reflecting agent, wherein the heat resistant insulation composite has a thermal conductivity of about 50 mW/(m·K) or less. The invention also provides a method of preparing a heat resistant insulation composite.

Abstract: The invention relates to an aggregated silica gel which has been produced from silica gel particles having a particle size of 1 to 20.mu., a surface of 200 to 1000 m.sup.2 /g and a specific pore volume of 0.4 to 2.5 ml/g and a binding agent selected from synthetic or natural phyllosilicate, pyrogenic silicon dioxide and organic polymers soluble in water or dispersible in water. Aggregation takes place by spray-drying a suspension having 1 to 25% solids. The product is suitable as a matting agent for coatings, as an antiblocking agent for polymer films and as a beer clarifying agent.