Resin product numbers usually have a spec sheet (list of properties) but they aren’t all the same. The tests themselves are standardized (ISO, DIN, ASTM) but there is no standard for which properties are reported. Melt index mysteries unmasked. Other important topics include test conditions, sample size and preparation method, tests on finished products, importance of repeat (multiple) testing, relating tests to applications, roles of trade and government entities, and contact numbers for further information. Online sources for such information will be given.