There are two completely different categories of products referred to as "powder cream," with vastly different technical specifications; they are described below:
Traditional Chinese Medicine (TCM) Powder Cream (Mercuric Chloride)
Core Physicochemical Parameters: Chemical formula HgCl₂; molecular weight 271.50; melting point 277°C; boiling point 302°C; density 5.44; water solubility 7.4 g/100 mL at 20°C; appearance is white granules or powder.
Safety Parameters: Highly toxic; toxic dose for oral ingestion is 0.1–0.2 g, and the lethal dose is 0.3 g. For external use only (dosage: 0.03–0.06 g mixed for topical application); oral ingestion is strictly prohibited; contraindicated for pregnant women.
Cosmetic Powder Cream (Base Makeup Product)
Basic Formulation Parameters: 92% of mainstream products utilize a silicone oil-based system as the film-forming carrier, combined with titanium dioxide and zinc oxide for coverage; 18% incorporate PMMA microspheres to achieve thixotropic properties.
Measured Efficacy Parameters: Medium-to-high coverage; SPF typically ranges from 15 to 25; third-party laboratory testing shows oil control and makeup longevity of 6.2–8.7 hours; visual pore-blurring effect is 17% superior to standard liquid foundations.
Skin Type Suitability Parameters: Formulas for dry skin require hyaluronic acid ≥0.3% or squalane ≥1.2%; formulas for oily skin must be non-comedogenic certified; formulas for combination skin maintain a stable pH between 5.2 and 5.6.
