The elasticity of a rubber band (how far it can stretch and snap back) depends on both the material properties and the band's physical design. Elasticity depends mainly on the rubber formulation, the vulcanization process, and the band's thickness/size, plus how it's stored and used.
Material Composition
The higher the natural rubber content in a rubber band, the greater its elasticity and resilience.
Crosslinking (Vulcanization)
Rubber bands are vulcanized using sulfur or other agents. A higher degree of crosslinking results in a stronger, stiffer rubber band with less stretchability. A lower degree of crosslinking results in a softer, more elastic rubber band, but also less strength under load.
Physical Dimensions
Thickness: Thicker bands resist stretching more.
Width: Wider bands spread force out, feel less stretchy.
Diameter/length: Longer bands seem more elastic since they can stretch farther before breaking.
Temperature & Environment
Warmth makes rubber more flexible and elastic.
Cold makes it stiff and brittle.
UV light, ozone, and oxygen break down polymer chains, reducing elasticity over time.
Age & Storage
Fresh rubber = high elasticity.
Old, dried-out rubber = cracks and loses stretch.
Storing in a cool, dark, sealed bag keeps elasticity longer.
In short, a rubber band's elasticity is shaped by what it's made of, how it's processed, its size, and the conditions it lives in. Fresh, well-stored natural rubber bands will always stretch better than old, sun-exposed ones. At Daoak, we control material formulation, vulcanization, and quality standards to ensure every band delivers consistent elasticity and durability, whether for office, industrial, or specialized use.
