Latex, Raw Rubber, Compound, and Vulcanizate: What Is the Difference?

Four Concepts

Latex: a liquid raw material in which rubber particles are dispersed in an aqueous phase; it is not a liquid rubber that has already been vulcanized, and its price per tonne cannot be directly compared with that of solid raw rubber.

Raw rubber: solid natural rubber after initial processing; it is plastic but has not yet been formulated or vulcanized, and is not a finished part that customers can use directly.

Compound: a semi-finished product obtained by mixing raw rubber with fillers, vulcanization systems, antioxidants, etc.; the production capacity of a mixing center does not equal the amount of natural rubber it procures on its own.

Vulcanizate: an elastic material obtained after the compound is cross-linked by heating; the final properties cannot be determined solely by the raw rubber grade.

Why It Matters

Quotation, consumption estimation, and quality verification all depend on this distinction. Treating compound output as raw rubber procurement volume, or attributing vulcanizate performance to a single grade, are the two most common mistakes made by newcomers.