CRYSTALLINE MELAMINE

Multicrystalline melamine powder having the following properties : d90: 50-1 50 .mu.m; d50 < 50 .mu.m; bulk density (loose) 430-570 kg/m3; color APHA less than 17; melamine: > 98.5 wt.%; melam: < 1 wt.% . Multicrystalline melamine powder obtainable via a high-pressure process in which solid melamine is obtained by the melamine me lt coming from the reactor being transferred to a vessel where the melamine melt is cooled with an evaporating cooling medium, characterized in that the melamine melt which comes from the melamine reactor and has a temperature between the melting point of melamine and 450 .degree.C is sprayed via spraying means and cooled with an evaporating cooling medium within a vessel in an ammonia environment at an ammonia pressure of 4.5-25 MPa, the melamine melt being converted into melamine powder having a temperature between 200 .degree.C and the solidification point of melamine, the melamine powder then being cooled to a temperature below 50 .degree.C, the powder bei ng agitated mechanically over at least part of the cooling range and being cooled directly or indirectly, and the ammonia pressure being released at a temperature below 270 .degree.C.