| abstract |
A polyolefin composition useful for building articles for outdoor use, for example siding, cladding, small pit or roofing. The composition comprises a polyolefin substrate having incorporated therein at least one additive selected from the group consisting of a) one or more ultraviolet absorbers, b) one or more hindered amine light stabilizers, and c) one or more antioxidants. Advantageously, the polyolefin substrate comprises d) at least one colorant, e) at least one filler, f) at least one flame retardant and optionally g) at least one antimicrobial compound. The composition has a specific performance level according to standard tests such as an impact strength > 35 in-lb according to ASTM D4226, a linear thermal expansion coefficient according to ASTM D696 < 4.5 x 10E-05 in / in / ft and optionally according to ASTM D6864 Acceptable low color delta E color and / or UL-94 V-1 or V-0 rating and / or ASTM E-84 for the intended color uniformity in the finished siding part and / or for the intended application in accordance with ASTM D2244 Lt; 200 < / RTI > |