Hazardous substances are one of the biggest pathogens in the workplace. The Stoffencheck app provides information about working with certain substances: what the risks are, whether you can become ill from it and what measures are needed to work safely. An explanation is given of the pictograms that are often on packages. It also explains what H and P phrases mean, what the limit values ​​of substances are, which ten substances are the most dangerous, which five rules of thumb apply to first aid