Acronym and details:
Group: thermoset
Developed: commercially, post World War II; heyday late 50s and early 60s; still in use for picnic ware and ashtrays
Trade names: Argosy; Gaydon; Melaware; Melmex
Manufacturing process: compression moulding
Cost: low
Colour: any, often two-toned
Transparency: always opaque
Rigidity: always rigid
Feel: hard
Smell: none
Other: porcelain-like; capable of high gloss
Typical uses: colourful table and picnic ware; ashtrays; a component of Formica™
Degradation: relatively stable but scratches and stains