... fluids, which is a starch derivative Common Name: API drilling starchPregelatinized potato starch. Low viscosity, fluid ... API 13A specifications.Appearance: White, cream, yellow, brown free-flowing powder. No lumps. Application: Drilling, workover or completion fluid loss control additive ... .Packing: in 25 kg multi-ply bags with a polyethylene layer. API Drilling Starch