ABS

A three-monomer compromise of stiffness, gloss, and toughness — the plastic LEGO is made of.

Core Principles & Analysis

• Each monomer contributes a virtue: acrylonitrile rigidity, butadiene impact strength, styrene gloss.
• LEGO has molded its bricks from ABS since 1963 to micrometre tolerances.
• Its low melting point and toughness made it the default filament of early 3D printing.

Specifications & Metrics

• MONOMER: Acrylonitrile + butadiene + styrene