Polyamides are artificially made polymers commonly known as nylon. Commercially available polyamides are mostly made from six-carbon diacids. However, for superior strength in the presence of chemicals and water, polyamides produced with long-chain diacids such as DC12, or long-chain polyamides, are preferable because such polyamides will retain resistance to many chemicals and maintain strength even in highly moist environments due to the reduced number of chemical links between the molecules within the polyamide.

Long-chain dicarboxylic acids (LCDAs), especially sebacic acid (SA, DC10) and dodecanedioic acid (DDDA, DC12), are key monomers for synthesizing high-performance polyamides (PA610, PA612, PA1010, PA1012, PA1212). Their unique long aliphatic chains endow the resulting nylons with a set of superior properties compared to short-chain counterparts (e.g., PA66, PA6), which are critical for demanding industrial and consumer applications.
- Key Products: Nylon 1212, nylon 612, nylon 1012, nylon 1110; copolyamides.

- Technical Advantages: Longer methylene chains reduce amide group density → improved low-temperature impact toughness, lower water absorption, better dimensional stability, superior chemical resistance (oils, greases, solvents) and fatigue resistance vs short-chain nylons (nylon 6, 66).