Fleck's self-cure Light Yellow zinc phosphate cement Powder, 29 Gm. Bottle. Formulated with zinc phosphate. Used for cementing procedures. May be used as a base for filling materials. Guards against disintegration. Fleck's Cement Powder contains zinc phosphate, giving it superior strength, overall retention, and protection against dissolution. It acts as a base for any filling material and is ideal for cementing crowns, inlays, fixed bridgework, orthodontic bands, and temporary fillings.