With REACH, responsibilty for safety data moved to the first marketer completely: In a simplified view, you can determine any classification with your best judgement as long as you considered all available information. Thus you need to check lists of acts and regulations, and use substance specific information.
With chemical inventories, you can verify marketability of chemical products. If there is no legal classification, the supplier needs to classify a product based on its properties. Biological limit values and workplace exposure limits require mentioning in every safety data sheet.
If a hazardous product is shipped, this needs to comply with dangerous goods regulations and the transportation data of different carriers.
Qualisys delivers the necessary up-to-date information.