TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The organosilicon compound is of formula (I).a,b = 0 or 1;Z = H, -Q-M or -Q-Rf when any one of a and b is 0 and other is 1, or Z = -Q-, -Rf'- or -Q-Rf'-Q- when a and b are 1;M = -(CH2)cSi(R)2H;c = 1-4;Q = 1-15C bivalent hydrocarbon group optionally containing ether;Rf = univalent perfluoroalkyl or perfluoro oxyalkyl;Rf' = bivalent perfluoro alkylene or perfluoro oxyalkylene;R = 1-20C monovalent hydrocarbyl;t = 1-3; ands = 0-3.Linear perfluoro polyether compound is represented by formula (II) or (III), preferably formula (IV).CH2=CH-(X)p-Rf0-(X')p-CH=CH2 (II)CH2=CH-(X)p-Q-Rf0-Q-(X')p-CH=CH2 (III)X = -CH2-, -CH2O- or -Y-NR'-CO-;Y = -CH2- or -Si(CH3)2-phenylene-;R' = H, methyl, phenyl or allyl group;X' = -CH2-, -OCH2- or -CO-NR'-Y'-;Y' = -CH2- or -phenylene-Si(CH3)2-;Rf0 = bivalent perfluoro polyether;p = 0 or 1;r = 2-6;Q = as above defined;m,n = 0-200;u = 1-6.The elastomer composition further comprises an organosiloxane which has epoxy group and/or trialkoxy group bonded to silicon atom via hydrogen atom, carbon atom or carbon atom and oxygen atom.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Powder: The surface of hydrophobic silica is processed with organosilane, organosilazane or organopolysiloxane. The BET specific surface area of hydrophobic powder is more than 50 m2/g. EXAMPLE - Polymer (in wt.pts) (100) of formula (7) having number average molecular weight of 17000 and viscosity of 10000 mPa.second, and hydrophobic silica (10) having BET specific surface area of 120 m2/g and treated with hexamethyl disilazane, were mixed for 1 hour without heating. The heat process was performed under reduced pressure for 2 hours at 150-170 degreesC. Organosilicon compound (110) of formula (HSi(CH3)2CH2CH2)3Si-CH2CH2-Si(CH2CH2Si(CH3)2H)3 (8), toluene solution of platinum divinyl tetramethyl disiloxane complex (0.4), 50% toluene solution of ethynyl cyclohexanol (0.3) and fluorine containing organosilicon compound (1.18) of formula C8F17CH2CH2-Si(CH2CH2Si(CH3)2H)3 (9) were mixed with the obtained base compound. The obtained composition was extruded on a polycarbonate resin board. The board was dried at 130 degreesC to form a sheet-like cured substance. The sample had excellent oil resistance and chemical resistance.