Abstract: A composition contains filler particles dispersed in a matrix material, wherein the matrix material contains: (a) 0.01 to 1.50 weight-percent of a first polyorganosiloxane, wherein first polyorganosiloxane is a linear polyorganosiloxane with an average of 2 or more carboxylic acid groups per molecule; and (b) 5 to 30 weight-percent of a second polyorganosiloxane that is free of carboxylic acid groups, wherein the second polyorganosiloxane is a liquid at 25 degrees Celsius and 101 megaPascals pressure; wherein the filler particles are present at a concentration in a range of 15 to less than 78 volume-percent based on composition volume and weight-percent values are relative to weight of the composition and wherein the composition is free of at least one of aliphatic diols and silicone polyethers.