The product YD-8115?812?8140 are the low molecular weight polyamide. It?s an excellent toughening epoxy curing agent. The low molecular weight polyamide resin contains soften fatty acid and active amine and the curing toughening is good when mixed with epoxy. The dosage of polyamide can be extended and the weighing accuracy is not strictly fixed. The action is very soft after mixed with epoxy so it can be used by a long time. Actually, the polyamide curing agent is non-toxic agent. The epoxy which solidified from polyamide ia also avirulent and can be used in food industry. The polyamide used in conjunction with epoxy can be widely used in paint, adhesion    agent and so on. Part of the polyamide curing agent can be solved in water.