Overview
EN 71-17:2025 - Safety of toys: Certain isothiazolinones (MIT, CIT, BIT) in aqueous toy materials is a CEN European Standard that specifies content limits and a laboratory test method for selected isothiazolinone preservatives in toy materials formulated with water. The standard is intended for toys designed for children under 36 months and for toys liable to be placed in the mouth. It provides a harmonized procedure for compliance with the chemical limits set under Directive 2009/48/EC and subsequent Commission Directives (EU) 2015/2116 and 2015/2117.
Key Topics and Requirements
- Scope: Applies to aqueous toy materials (materials formulated with water during manufacture) used by young children or intended to be mouthed.
- Limit values (maximum content in mg/kg):
- BIT (1,2-benzisothiazol-3(2H)-one): 5 mg/kg
- Reaction mass (5‑chloro‑2‑methyl‑4‑isothiazolin‑3‑one and 2‑methyl‑2H‑isothiazol‑3‑one (3:1)): 1 mg/kg
- CIT (5‑chloro‑2‑methyl‑isothiazolin‑3(2H)-one): 0.75 mg/kg
- MIT (2‑methylisothiazolin‑3(2H)-one): 0.25 mg/kg
- Analytical principle: Sample extraction in methanol containing deuterated internal standards followed by liquid chromatography with tandem mass spectrometric detection (LC‑MS/MS) operated in multiple reaction monitoring (MRM) mode.
- Method details: Includes sample preparation (example: ~0.5 g sample + 7.5 mL extraction solution, vortex), required reagents (methanol, formic acid, purified water), internal standards (d3‑MIT, d3‑CIT), calibration procedures and performance parameters (limit of quantification, precision).
- Safety and regulatory linkage: Informative annexes explain rationale and relationship to Directive 2009/48/EC.
Applications and Who Uses EN 71-17
- Toy manufacturers & formulators: To design and verify aqueous toy products (e.g., paints, gels, slimes, water-based toys) comply with isothiazolinone limits.
- Third‑party testing laboratories: For validated LC‑MS/MS testing and reporting of MIT, CIT, BIT concentrations in aqueous toy materials.
- Regulators and market surveillance authorities: To assess conformity with EU toy safety chemical limits and enforce Directive 2009/48/EC.
- Compliance officers and product safety managers: To interpret limit values, specify testing requirements in supply chains and ensure documentation for CE marking.
Related Standards
- EN 71 series (relevant parts): EN 71‑1 (mechanical/physical), EN 71‑10 / EN 71‑11 (organic compound sample prep and analysis), EN 71‑7 (finger paints) and other parts dealing with chemical safety and migration testing.
- Laboratory reference: EN ISO 3696 (water for analytical laboratory use) is cited for reagent quality.
Keywords: EN 71-17, isothiazolinones, MIT, CIT, BIT, toy safety, LC-MS/MS, aqueous toy materials, limit values, CEN, Directive 2009/48/EC.
