TECHNOLOGY FOCUS - POLYMERS - Preferred Article: In the article, the body portion comprises a polypropylene containing reinforcement component (up to 50 wt.%); the composition of the body portion has a coefficient of linear thermal expansion (CLTE) which is within factor of 20 of the CLTE of the photovoltaic cell assembly. In the article, a roofing construction containing the article passes the UL 790 flammability test class B. In the article, the body portion comprises polypropylene, and/or copolymer of propylene and ethylene (20-80, preferably 30-80 wt.%), which has a melt flow rate of 5-100 g/10 minutes; polyethylene, and/or an ethylene/ alpha -olefin copolymer (5-30, preferably 20-30 wt.%), which has a melt flow index melt index of 1-100 g/10 minutes and density of at least 0.85 g/cm3 to less than 0.97; and an inorganic fire resistant material (10-50 wt.%, or less than 100 parts per million iron). In the article, the body portion further comprises: UV absorber or UV absorbing pigment (up to 10 wt.%); UV stabilizer (up to 3 wt.%); antioxidants (up to 2 wt.%); heat stabilizer (up to 2 wt.%); an additional propylene ethylene copolymer (up to 20 wt.%); and additional inorganic filler or reinforcement component (up to 15 wt.%). Preferred Composition: The composition (C1) contains less than 100 parts per million (ppm) iron. The composition further comprises UV absorber or UV absorbing pigment (up to 10 wt.%); UV stabilizer (up to 3 wt.%); antioxidants (up to 2 wt.%); heat stabilizer (up to 2 wt.%); an additional propylene ethylene copolymer (up to 20 wt.%); and additional inorganic filler or reinforcement component (up to 15 wt.%). EXAMPLE - A composition comprising (wt.%): 5D49 (RTM: polypropylene resin) (25.98), Engage 8200 (RTM: ethylene/octene copolymer with a 5 g/10 minutes melt flow rate) (12.8), FR-20-100 (RTM: magnesium hydroxide) (30), DFNA 0037 (RTM: linear low density polyethylene with a carbon black content of 43-47 wt.%) (5), Irganox 1010 (RTM: tetrakis(methylene(3,5-di-tert-butyl-4-hydroxyhydrocinnamate))methane) and Irganox 1024MD (RTM: N,N'-bis(3-(3',5'-di-tert-butyl-4'-hydroxyphenyl)-propionyl)hydrazine) in 4:1 weight ratio (0.32), Naugard 412S (RTM: beta -laurylthiopropionate) (0.2), and Versify 4200 (RTM: polyolefin plastomer athylene copolymer with number average molecular weight of 35000) (25.7) was prepared.