polymer product molecular weight In leather chemical, one of the most concerned question in the discussion of polymer products is that, weather the product is a micro or macro-molecule product. Because among the polymer products, molecular weight ( to be precise, the average molecular weight. a polymer product contains micro and macro-molecule components, thus when speaking of molecular weight, it usually refers to the average molecular weight.) is one of the principle bases of the product’s properties, it might affect the product’s filling, penetrating property as well as the soft and suave handle of the leather it could endow. Of course, the final property of a polymer product is related to various factors such as the polymerization, chain length, chemical structure, functionalities, hydrophilic groups, etc. The molecular weight could not be regarded to as the sole reference of the product property. The molecular weight of most of the polymer retanning agents on the market is around 20000 to 100000 g/mol, the properties of products with molecular weight within this interval shows more balanced property. However, the molecular weight of two of Decision’s products is outside of this interval in the opposite direction.