The curing agent HR-502 is a curing agent that has acceptable optical properties, relatively low viscosity ، The cooking speed (lattice) is high and is considered one of the modified polyamines . HR-502 has been designed and produced for expedient applications and compositing building stones in the temperature range of C ° 15-65, but in applications such as making composites with engineering properties ، Restoration of buildings, austermacitors, industrial adhesives, halal body coverings and… are used .