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Canada periodically puts out mandatory survey on batches of chemicals as it works through its prioritization process. For example in June there were 8 MDA/MDI chemicals of interest. It’s a pretty comprehensive set of information demanded of manufacturers, importers and processors: volumes, uses available toxicity information and a list of the top 20 customers. With the possible exception of getting customer lists, such information can be obtained under TSCA section 8 – basically CDR + 8(d) – applied to manufacturers, importers and processors.