A
powder coating composition comprising an intimate mixture of at least one
thermoplastic and / or thermosetting resin binder and optionally, at least one crosslinking agent and constituents conventional in
powder coating compositions, such as, pigments, fillers and additives, comprising aluminum particles having a D50 in a range of 8 to 20 μm whereby the aluminum particles are treated with compounds selected from the group consisting of silica, (
meth)acrylic polymers, polyesters and
wax; the
powder coating composition provides coatings with a value of thermal
emissivity in a range of 0.4 to 0.55 with total
solar reflectance values in a range of 60 to 70% in the
infrared (IR) and / or near IR (NIR)
wavelength region of 0.3 to 2.5 μm, to minimize the heat transportation through a substrate coated by the
powder coating composition, e.g., from a warm building to a colder environment.