Fraunhofer Identifies Odor-Causing Substances in Acrylic Adhesives

Researchers at the Fraunhofer Institute for Structural Durability and System Reliability LBF have identified 27 specific odorant compounds that cause unpleasant smells in acrylic adhesives, commonly found in products ranging from automotive windshields to footwear. This research provides adhesive manufacturers with tools to optimize product development and identify potential sources of harmful substances.

Little has been known until now about the specific substances causing odors in acrylic adhesives. The Fraunhofer IVV's Department of Sensory Analytics has identified compounds such as methyl methacrylate and acetophenone. For the first time, 20 odor-active compounds, including borneol, were identified. Researchers caution that strong odors can indicate the presence of hazardous substances, citing mutagenic phenolic compounds found in some samples.

The study offers manufacturers solutions and strategies to improve the odor characteristics of products including paints, binders, furniture, and plastics. The analyses require specialized techniques, such as gas chromatography and mass spectrometry, along with trained test subjects to identify impurities and byproducts from the manufacturing process. The human sense of smell is considered irreplaceable in this context.

Fraunhofer's research also provides a basis for psychological and toxicological evaluations. The institute supports manufacturers in developing improved products by reducing unpleasant odors and potential health risks associated with scented chemicals in consumer goods.