How natural rubber latex is harvested

Rubber trees are tapped before dawn, because the milky sap keeps dripping longer while the air is still cool.

stations: 3
things downstream: 43

The short version

Natural rubber latex is the white sap of the Amazonian rubber tree. Tappers shave a thin half-spiral groove into the bark, and the latex runs down it into a cup. They work in the cool of the night or early morning so it drips longer before it clots, and ammonia can keep it liquid.

Raise the plantation trees

Rubber trees grown on plantations have an economic life of around 32 years. Up to 7 years of that is an immature phase, and the remaining 25 or so are the years the tree is tapped.

about 25 productive years
Slice a spiral groove

The tapper peels a thin strip of bark away along a downward half spiral with a hooked knife, cutting to a depth of 6.4 mm. A tree needs to be about 150 mm across before it is tapped, and it is never cut down to get the latex.

6.4 mm deep
Catch the milky drip

Latex runs along the groove into a cup, and a fresh panel will keep yielding for up to five hours. Work happens at night or early morning so the latex drips longer before it coagulates and seals the cut. An ammonia solution can be added to stop it from clotting.

End of the lineNatural rubber latex Next it goes into condom, vulcanized rubber, balloon and 6 more.

Worth repeating

In 1876 Henry Wickham smuggled 70,000 rubber tree seeds out of Brazil to Kew Gardens, and only 2,400 of them germinated.
More than 29 million tonnes of rubber were produced in 2022, and over half of it was synthetic, so oil prices pull on the price of the natural kind.
Slaughter tapping, a destructive late nineteenth-century method, pulled out large amounts of latex in a short time.