Is Silicone Quaternium-18 safe in cosmetics?
Silicone Quaternium-18 has a safety rating of "MODERATE" in our database. EU status: permitted. US status: permitted.
Moderate
Cosmetic Ingredient
Silicone Quaternium-18
INCI: SILICONE QUATERNIUM-18
Silicone Quaternium-18 (CAS Not assigned) is a cosmetic cosmetic ingredient functioning as Hair conditioning, skin conditioning (emollient). EU Regulation 1223/2009 status: permitted. Industrial safety data is also available in the chemical safety database.
View industrial chemical safety profile for CAS Not assigned →
Auto-generated CPSR Part A draft with source citations
Function
Hair conditioning, skin conditioning (emollient)
Safety Rating
MODERATE
Regulatory Status
EU EU Status
permitted
US US Status
permitted
US Notes
No FDA restrictions. Not an OTC active.
For full compliance data across multiple jurisdictions, use the Substance Compliance tool.
Safety Data
Margin of Safety, dermal absorption, and sensitization profile summaries for Silicone Quaternium-18.
Calculate MoS for your specific formulation with the MoS Calculator.
Additional Ingredient Properties
3 property records from structured ingredient metadata.
hair_care
{"hair_function": "conditioning", "hair_type_suitability": "medium/coarse", "curl_pattern_suitability": "curly/coily", "porosity_suitability": "high", "protein_sensitivity": "neutral", "moisture_protein_balance": "modified-cg", "cg_method_approved": "non-water-soluble", "silicone_type": "not-a-sulfate", "sulfate_type": "no", "drying_alcohol": "no", "fatty_alcohol": "yes", "heat_protectant": "yes",…
polymer
{"ingredient_class": "conditioning", "polymer_type": "silicone_based", "chemical_backbone": "other", "molecular_weight_Da_range": "5000-42000", "ionic_character": "cationic", "charge_density_meq_g": "0.5-1.1", "pH_viscosity_sensitivity": "moderate", "salt_tolerance": "moderate", "electrolyte_effect_on_viscosity": "moderate", "temperature_viscosity_sensitivity": "moderate", "film_transparency": "tr…
silicone
{"cas_number": "68439-57-6", "silicone_class": "amodimethicone", "molecular_weight_Da": "11100.0", "viscosity_cSt": "5200", "volatility": "non_volatile", "evaporation_rate_relative_to_D5": "0.0032", "refractive_index": "1.4076", "specific_gravity": "0.982", "flash_point_C": "142.0", "surface_tension_mN_m": "22.28", "spreading_coefficient": "3.69", "film_forming_ability": "excellent", "skin_feel": …
Expert Verdict
Expert safety assessment and concern-level summary for Silicone Quaternium-18.
Frequently Asked Questions
Is Silicone Quaternium-18 allowed in the EU?
Silicone Quaternium-18 EU regulatory status: permitted. This is based on EU Regulation 1223/2009 and its amendments.
What does Silicone Quaternium-18 do in cosmetics?
Silicone Quaternium-18 functions as: Hair conditioning, skin conditioning (emollient). It is classified as a cosmetic ingredient in our database. CAS number: Not assigned.
Compliance Tools
Check Silicone Quaternium-18 compliance across multiple jurisdictions:
Ingredient Decoder
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82 Allergen Checker
Check for EU declarable fragrance allergens
Substance Compliance
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MoS Calculator
Calculate Margin of Safety using SCCS methodology
Heavy Metal Limits
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