Abstract: In a separator made of elastic synthetic material for starter batteries, which has a sheet thickness of approx. 0.15 to 0.35 mm and solid ribs formed integrally on both sides from the synthetic material, such that on the front side of the separator facing the positive electric plate a number of ribs is arranged, the height of which is greater than the thickness of the separator sheet, while the ribs on the rear side of the separator facing the negative electrode plate have a smaller height than the ribs on the front side, there are ribs on the rear side each arranged offset to the ribs on the front side, such that a front-side rib runs between two rear-side ribs arranged as a pair, or a rear-side rib runs between two front-side ribs arranged as a pair, such that the distance between the two ribs arranged in a pair is considerbly smaller than the distance between the adjacent groups each formed of three associated ribs.

Abstract: Combined antiblocking agent and lubricant concentrate based on polyolefin, which contains diatomaceous earth, precipitated silica and/or silica gel as the antiblocking agent, one or more amides of unsaturated C.sub.18 -C.sub.22 -fatty acids and optionally further conventional additives and which is characterized in that it contains 5 to 35% by weight of antiblocking agent and 5 to 30% by weight of lubricant. The high lubricant concentration in the combination concentrate according to the invention is obtained in that the antiblocking agent and the lubricant are incorporated into the polyolefin in the form of a homogeneous, finely divided mixture. The antiblocking agent serves as a carrier for the micronized lubricant, i.e. the lubricant is adsorbed on the large surface of the antiblocking agent, so that the "flowing away" of the lubricant otherwise observed in the case of high lubricant concentrations during incorporation into the polyolefin is avoided.