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Latex is a sticky, milky colloid drawn off by making incisions in the bark of the Pará rubber tree (Hevea brasiliensis) and collecting the fluid in vessels in a process called “tapping”. The latex then is refined into rubber ready for commercial processing.

In major areas, latex is allowed to coagulate in the collection cup. Concentrated Latex is derived from Field Latex and is processed using centrifuge methods. It contains 60% Dry Rubber Content (DRC). There are two main types of Concentrated Latex available in the market: High Ammonia or Standard Ammonia Concentrate (HA Latex) and Low Ammonia Concentrate (LATZ).


1 Metal Drum (non-returnable; internal-lined) = 205 kg
1 Container, 20-ft FCL (80 Metal Drums) = 16.4 MT
1 Flexi Bag per container, 20-ft FCL = 20 MT

Requirements of ISO 2004 for centrifuged and creamed natural rubber latex concentrates:

Total solids content, %, minimum¹ 61.5 61.5
Dry rubber content, %, minimum 60.0 60.0
Non-rubber solids, %, maximum² 2.0 2.0
Ammonia, % on latex 0.6 0.29
minimum maximum
Mechanical stablity, s, minimum³ 650 650
Coagulum content, %, maximum 0.05 0.05
Copper, ppm, maximum* 8 8
Manganese, ppm, maximum* 8 8
Sludge content, %, maximum 0.10 0.10
latile fany acid (VFA) number As agreed between the interested parties but not to exceed 0.2
KOH number As agreed between the interested parties but not to exceed 1.0
Colour No pronounced blue or grey
Odour° No pronounced odour of putrefraction