TSR: Technically specified rubber is a form of natural rubber comparable to that of Synthetic rubber with respect to grading by technical standards & packing.
TSR is obtained from latex, field coagulum or both. TSR is produced by almost all countries which produce NR & marketed under different brand names.
- India - Indian Standard Natural Rubber (ISNR)
- Malaysia - Standard Malaysian Rubber (SMR)
- Thailand - Standard Thai Rubber (STR)
- Indonesia - Standard Indonesian Rubber (SIR)
- Srilanka - Sri Lankan Rubber (SLR)
Currently there are six grades of TSR marketed in India.
1) ISNR 3CV
- Produced from high quality latex, viscosity stabilized grade having Mooney viscosity of 60 + /- 5 Excellent Physical Properties Used for tyres, engineering products, extruded profile, calendered products requiring consistency.
2) ISNR 3L
- Produced from high quality NR latex light colour (lovibond 6), good substitute for pale latex crepe (PLC). used for printing rollers, pharmaceutical and medical applications.
3) ISNR 5
- Produced from field latex and high quality coagulum. Suitable for engine mounts, footwears, conveyer belt. Good alternative to high quailty RSS etc.
4) ISNR 10,20 & 50
- These grades are produced from high quality field coagulum. Good replacement for low quality RSS grades. ISNR 10 & 20 are used for tyre manufacture. ISNR 50 is suitable for moulded products.
(Source - Natural Rubber RRII Publication)