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. Quantity: 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 SPHERILEX DP 0111 SIPERNAT® 50 S SIPERNAT® 880 SIPERNAT® 350 SIPERNAT® 22