Sil-Trax AS Braided Aluminum Sulfate Size 00, not Aluminum Chloride. Siltrax AS 0 Catalog Description - Braided Retraction Cord, Impregnated with (AS) Aluminum Sulfate. Ideal for creating full exposure of the margin which is the foundation for success in both conventional and digital dentistry. Braided, 100% pure cotton retraction cord impregnated with a solution of aluminum sulfate, then dried by a special process, assuring both consistent aluminum sulfate content and hemostatic retraction properties. Pascal's unique and proprietary NTS technology helps ensure consistent amounts of medicament throughout the entire length of the retraction cord. Consistent medication can help lead to consistent results. Available in Sizes 00, 0, 1, 2