Perished Rubber Bands

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Perished Rubber Bands
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These rubber bands are made from natural rubber. To make natural rubber, a milky white sap, called latex, is tapped from a rubber tree. An acid, such as formic acid, is added to the latex to make it coagulate, and then it is passed through rollers to remove excess water, and the whole thing is dried. This purified natural rubber is polyisoprene, which is both an elastomer and a thermoplastic. To make the rubber bands, this purified rubber is drawn out into a long tube, which is then cut into slices. Over time, rubber loses its ability to stretch, becoming hard and brittle. This process of perishing occurs because exposure of the rubber to light and air induces chemical changes in the polyisoprene over time.

Sample ID: 335

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Particularities

Chemical symbol
C5H8
State
Object
Compound
Donated by
The Laughlin family
Selections
Categories
Polymers
Curiosities
Damage
Relationships
Elastomer | Latex | Polyisoprene | Thermoplastic | Hard | Brittle | Perished

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