SSP fertilizer 16% or 18% 1.P2O5:16% Min 2.Free acid:5.5% Max 3.Moisture:9% Max 4.Size:2-4.75mm,90% Min. Below is the specification for SSP:Single Super Phosphate (SSP) Specification:Available phosphate:16%minMoisture:9%maxFree phosphoric acid:5.5 %maxParticle size (2-4.75mm)90% min pass