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Active Ingredient Hyaluronic Acid (HA), 15–25 mg/mL
Cross-linking Agent 1,4-butanediol diglycidyl ether (BDDE) or equivalent
Buffer Solution Phosphate Buffered Saline (PBS), pH ~7.0
Water Content ~97%
Other Ingredients Lidocaine (optional, typically 0.3%) for pain reduction

3. Physical Properties
Parameter Specification
Appearance Clear to slightly opalescent gel
Viscosity 5,000–30,000 mPa·s (depends on filler type)
Particle Size 200–1,000 µm (depending on product type)
pH 6.5–7.5
Sterility Sterile, pyrogen-free
Shelf Life 18–24 months