Quantitative evaluation of hazardous VOC emissions from tactile toys and investigation of emission drivers

Tactile toys are handled at close range for prolonged periods, posing potential inhalation risks from volatile organic compounds (VOCs); however, product-specific emission standards are currently absent. We quantified VOCs emitted from nine commercial tactile toys using thermal desorption-gas chromatography-mass spectrometry. Emissions were evaluated using a two-dimensional classification (functional groups and hydrocarbon backbones) and normalized by product mass and surface area. Total VOC concentrations ranged from 24.8 to 775 μg m^-3 g^-1. Within a given product, increasing the material quantity resulted in highly linear increases in most emitted VOCs (R² > 0.9), confirming a predictable “dose-with-use” behavior. Across products, class-specific scaling was evident: aromatics scaled with mass (R² = 0.8234), while sulfur-containing compounds scaled with both mass and surface area (R² > 0.8362). Stratification by sensory attributes revealed that sticky and sweet-scented products exhibited significant scaling for ethers and alcohols, likely driven by high free volume and surface-localized additives. Hazardous process-related residues, including dimethylformamide and methylene chloride (identified via NIST library search with >95% similarity), were detected at levels that, in screening-level comparisons, significantly exceeded the US EPA Reference Concentrations. These findings characterize the “initial burst” of high-concentration VOCs encountered upon product unpacking, providing a critical benchmark for acute exposure risks. This research underscores the importance of controlling residual solvents and highlights the urgent need for standardized, product-specific emission testing and safety guidelines for tactile toys.