Type of plastic that remains rigid when set, and does not soften with heating. Thermosets have this property because the long-chain polymer molecules cross-link with each other to give a rigid structure. Examples include Bakelite, resins, melamine, and ureaformaldehyde resins.
The triangle represents equality and the rainbow signifies peace. The arms may be replaced by the motto Dios, Union, Libertad, ‘God, Union, Liberty’. Effective date: September 1972.