Rubber Raw

Any of various products (such as GR-S, neoprene, butyl rubber, or nitrile rubber) that resemble natural rubber more or less closely especially in physical properties and ability to be vulcanized, that are made usually by polymerization of butadiene, isoprene, or similar unsaturated hydrocarbons or by copolymerization of such hydrocarbons with styrene, isobutylene, acrylonitrile, or other polymerizable compounds, and that have uses similar to those of natural rubber but are superior for some applications and inferior for others and are often used in combination with natural rubber.

Details

Technically specified natural rubber (TSR) - Standard rubber

The International Standards Organisation (ISO) first published the draft Technical Specifications for Natural Rubber during 1964. Based on these specifications, Malaysia introduced their Standard Malaysian Rubber (SMR) scheme in 1965 and since then all the natural-rubber-producing countries have started producing and marketing NR as Technically Specified Rubbers. This resulted in the introduction of further national standards in addition to SMR:

Standard Malaysian Rubber SMR
Standard Indonesian Rubber SIR
Standard Sri Lanka Rubber SSR
Standard Vietnam Rubber SVR
Indian Standard Natural Rubber ISNR
Standard Thai Rubber STR

These quality standards lay down the maximum permissible content of dirt, ash, nitrogen and volatile substances. The following table shows some SMR values:

Parameters	Dirt content (max. %)	Ash content (max. %)	Nitrogen content (max. %)	Volatile matter (max. %)	Color coding
SIR/SVR/SMR - 5	0.05	0.60	0.60	0.80	pale green
SIR/SVR/SMR - 10	0.08	0.75	0.60	0.80	Brown
SIR/SVR/SMR - 20	0.16	1.00	0.60	0.80	Red

SMR 10, SMR 20 and SMR 50 are general-purpose grades, with SMR 10 being a high grade, SMR 20 a medium grade and SMR 50 a lower grade.

If finer distinctions between different categories of rubber are required, it is recommended that the purchaser and seller agree on the quality of the rubber on the basis of a sample.

Packaging

TSRs are wrapped individually in plastic sheeting (polyethylene) and stacked on pallets. These are unitized using shrink-wrap sheeting or a shroud of plastic film and are also attached to the pallet with plastic strapping. A labeling strip must be attached to each load unit.Alternatively, TSRs can be packed in wooden or steel crates and secured to pallets. The crates are unitized by being attached to the pallet with steel straps.TSRs are generally packaged as 33 1/3 kg bales. Generally, 36 bales are loaded on a pallet.

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