Additive composition and compositions and articles containing the same

A composition comprising:

• a rubber comprising natural rubber, nitrile butadiene rubber (NBR), butadiene/styrene rubber, butadiene/acrylonitrile rubber, silicone rubber, or a combination thereof;
• filler;
• and
• an additive composition comprising:
• a fluoropolymer;
• a synergist, wherein the synergist comprises a poly(oxyalkylene) polymer, a polycaprolactone, or a combination thereof;
• and
• a fatty acid metal salt,
• wherein the amounts by weight of the fluoropolymer, the synergist, and the fatty acid metal salt range from 90-10%:90-10%:80-5%, respectively, based on the total weight of the additive composition.