LEGO rubber bands, along with other elastic components and tires in some sets, are primarily made from Styrene-Butadiene Styrene (SBS).
According to information shared by the LEGO Group itself, as quoted on bricks.stackexchange.com in July 2016:
"Tires and elastic materials found in some LEGO sets are manufactured from Styrene-Butadiene Styrene (SBS), a material commonly found in vehicle mud guards and shoe soles."
Understanding SBS
Styrene-Butadiene Styrene (SBS) is a type of synthetic rubber. It's a thermoplastic elastomer, meaning it behaves like rubber at room temperature but can be processed like plastic when heated.
Key characteristics of SBS include:
- Flexibility and Elasticity: Excellent ability to stretch and return to its original shape.
- Durability: Resistant to wear and tear, making it suitable for parts that undergo stress.
- Processing: Can be molded and shaped relatively easily.
Why SBS for LEGO?
LEGO likely chooses SBS for its elastic parts like rubber bands due to its balance of properties:
- Reliable Performance: Provides consistent elasticity needed for functional LEGO models (e.g., mechanisms, vehicles).
- Safety: SBS is a widely used material in consumer goods, including items for children, and meets necessary safety standards.
- Compatibility: Integrates well with LEGO's existing manufacturing processes and other plastic materials.
This material choice ensures that the elastic components of LEGO sets are both functional and durable for building and play.
