Description: It is one of cyclo-amidine compounds, equivalent to HUELS AG B31. RB31 is a low temperature and fast curing agent applying to high-activated epoxy-resin powder, and it can be rapidly solidified in 10 to 15 minutes at 140 celsiur scale or in 3 to 5 minutes at 200 celsiur scale. For preparation of aid to low-temperature solidified saturated carboxyl-polyester, for example, in production of polyester resin, it is added 0.1 to 0.5% (of polyester weight) into the reactor at the stage of input, and stirred well distributed, a special low-temperature solidified polyester resin can be produced. Compared with the same kind, it can be lowered about 20 celsiur scale for solidification in normal atmospheric temperature. Appearance: Pale yellow crystal powder. Purity: Larger than 99%. Melting range: 95 to 101 celsiur scale. Application: It is an accelerating agent to pure epoxy-resin powder or compound epoxy/polyester-resin powder for cyanoguanidine as hardener. Package: 20kgs/Polyethylene kraft bag. Storage: In a cool and dry place, and valid for six months in normal atmospheric temperature.