Glossary

Technically Specified Rubber — block natural rubber graded by measured technical parameters.

Plasticity Retention Index — resistance of raw rubber to thermal oxidation, as a percentage.

Initial Wallace plasticity of raw rubber before ageing; an indicator of molecular weight.

Proportion of insoluble contaminants retained on a 44-micron sieve; a key cleanliness limit.

Ribbed Smoked Sheet — natural rubber graded visually by appearance rather than lab tests.

Free On Board — seller delivers on the vessel; buyer then pays freight, insurance and risk.

Cost, Insurance and Freight — seller pays freight and insurance to the destination port.

Certificate of Analysis — a document reporting a batch's measured properties against spec.

Singapore Commodity Exchange (now under SGX) — the benchmark venue for TSR 20 futures.