Natural Rubber is consisting essentially of cis-1,4-polyisoprene with small amounts of naturally occuring non-rubber constituents ( proteins, lipids ). The raw material for the production of TSR must be derived from trees of the Hevea Brasiliensis. Natural Rubber is a non-hazardous material, however normal safety precautions for good industrial hygiene and safe working should always be taken.

Natural Lattices


The main origins of TSR rubbers are Malaysia, Thailand and Indonesia. Inpol, S.A. however can supply similar, compatible and competitive grades from many other origins in Asia and West Africa.

Standard Grades

Most natural rubber produced today conforms to the TSR (Technically Specified Rubber) scheme developed over the last 40 years or so. This scheme specifies standardized quality parameters and test methods for each grade of rubber as well as a standardized packing of either 33 1/3 Kilo or 35 kilo bales wrapped in thin, dispersible polyethylene or thick, strippable polyethylene. TSR rubber is usually packed with 36 bales on a crated or shrink-wrapped standard size pallet. Crate size is 1200 or 1260 Kilos.

The TSR scheme consists of the following grades:

Individual rubber producing countries are in charge of setting the acceptable limits for each grade of rubber they produce. The four main countries producing rubber have their own schemes patterned after the TSR scheme:

INPOL also has connections with producers in other countries, such as Cambodia, Sri Lanka, and several West African nations. Please call us for specific recommendations on the applications of these grades of rubber.

Visually Graded Types

Prior to the invention of the TSR (Technically Specified Rubber) scheme, Natural Rubber was collected from small holders in various forms and separated into specific grades based on a visual inspection. Rubber sheets were then compressed into various sized bales. These grades are still best for certain applications and are now available packed similar to TSR type packaging.

Ribbed Smoked Sheets (RSS)

This material consists of deliberately coagulated rubber sheets, completely dried using smoke. These sheets are then graded into three main grades according to their color, consistency and observed impurities. The purest is RSS1 though the largest traded volume is in RSS3. RSS is sold in standard TSR pack (designated S/B for small bales) consisting of a compressed bale of 33 1/3 or 35 Kilos wrapped in dispersible polyethylene or thick, strippable polyethylene. Crate size is 1200 or 1260 Kilos.

RSS is used when extra tough (due to extensive cross linking) rubber is needed. Some applications are tyres, tank liners, industrial products, etc. RSS is generally more difficult to process than TSR.

Pale Crepe

This material consists of carefully collected fresh liquid latex, deliberately coagulated and (sometimes) bleached, milled to produce crepe of a thickness corresponding approximately to standardized thickness, either thin or thick. A number of different grades are available with the purest being 1X Thick Pale Crepe (1XTPC) while the most popular is 1 Thick Pale Crepe (1TPC). 2 Thick Pale Crepe is also available. Pale Crepe is usually sold in 25 Kilo bales with 32 bales packed onto a crated pallet of 800kgs, suitable for Ocean Container shipping.

Pale Crepe is used applications which require light color and sweet smell, such as medical rubber goods, footwear, cements and adhesives.