EVONIK CORPORATION › SIPERNAT® D 13 SIPERNAT® D 13 $0.00 SIPERNAT® D 13 is a fine milled, hydrophobic (not wettable by water) silica, high methanol wettability and low surface area. Add To Cart Added! SIPERNAT® D 13 is a fine milled, hydrophobic (not wettable by water) silica, high methanol wettability and low surface area. You Might Also Like SIPERNAT® 500 LS SIPERNAT® D 17/2 SIPERNAT® 350 SIPERNAT® 35 SIPERNAT® 28