INCI Name: Polyquaternium-7

Alternative names: dimethyl diallyl ammonium chloride-acrylamide copolymer, PQ-7, M550

CAS：26590‑05‑6

Molecular formula: C11H21ClN2O (high molecular weight copolymer, molecular weight approximately 200,000–4,000,000)

Ion type: Cationic polymer

Physicochemical properties

Appearance: Colorless to light yellow, transparent, viscous liquid (the product is a water solution, not a solid) 

Solid content: Mainstream specifications 10% / 20%

Density (25°C): 1.02–1.07 g/mL

pH：3.0‑5.0

Viscosity (25°C): 7000–16000 mPa·s

Dissolution: Fully soluble in water; excellent compatibility with anionic surfactants such as AES, K12, and 6501, resistant to turbidity and precipitation. 

Features: High positive charge density, low accumulation, minimal residue on hair, stable over a wide pH range

Typical Technical Specifications (Cosmetic Grade, 20% Solid Content)

Appearance                         Colorless to pale yellow transparent viscous liquid

Solid content, %                  20.0±1.0

pH                                     3.0‑5.0

Viscosity (25℃), mPa・s      7500‑15000

Residual acrylamide             ≤1 ppm

Shelf life                             12 months

Main use (primarily as a cosmetic ingredient)

Hair care products: hair conditioner, deep conditioning oil, styling mousse, gel, and film-forming conditioning agents.

Skincare products: shower gel, hand sanitizer, and shaving cream, which provide silky and moisturizing skin feel while reducing dryness.

Safety and Storage & Transportation

Low irritancy, compliant cosmetic ingredients; avoid contact with eyes.

Packaging: 125kg/200kg plastic drums.

Storage: Store in a cool, light-protected, and sealed container at 0-40°C, protect from freezing; prevent microbial growth.

Differentiation: