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Types of TSRs
Advantages over the sheet and crepe grades of rubbers 3
TSR is graded net visually, but according to the source
of the rubber (latex or field coagulum) and on its properties
the bale size is reduced to a more convenient weight of 33.5
kg(75 lb). The bales are pached in polyethylene sheets to
Dry natural rubber graded or the basis of technical
parameters are called Technically Specified Rubbers.
TSR's are the major volume grades of dry rubber in
production and exports in the major NR exporting countries of
the world. In Malaysia, the TSR is designated as Standard
Malaysian Rubber(SMR). In Indonesia, the designation given is
Standard Indonesian Rubber(SIR). In Thailand the TSR's are
called Standard Thai Rubber (STR) . In India, the TSR's are
designated as Indian Standard Natural Rubber(ISNR).
Types of TSRs
The international standards
Organization(ISO) have specified 6 different
grades of Technically Specified Rubber.
TSR-CV is produced from high quality field latex.
Rubber is viscosity stabilized at narrow money viscosity
range. The accelerated storage hardening of this grade of
rubber will be within 8 units.
TSR-CV Rubbers are generally softer than
conventional grades. Coupled with its constant viscosity
feature, it provides a unique cost advantage in eliminating
the premastication process and high reject rates, when
used in open mill the rubber forms coherent band almost
instantaneously thus increasing the milling through put.
The non scorch characteristics of the rubber will permit
higher curing temperature to be adopted without risk of
• Mechanical mountings for engine
•Bridge bearings/inner tubes and cement
•conveyor belt covers
•Low density sponge
•Injection moulded products including
It is a light colour rubber produced from high
quality latex, having low ash and dirt content .
The attractive features of TSR L is the light
colour property together with its cleanliness and
excellent heat ageing resistance. Technologically
TSR L exhibits excellent vulcanisate properties
having high tensile strength, modulus and
elongation at break for both black and non black
mix. Higher hardness product can also be
obtained with suitable compounding.
•Textiles and paper printing industry
•Adhesive solutions and tapes.
It is produced from fresh coagulam and or
from unsmoked sheets, Ribbed smoked sheets and
Air dried sheets.
TSR5 has superior strength property together
with low mill shrinkage and good tack. It processes
better especially in extrusion, calendering, and
joining of cycle inner tubes.
TSR 10 is produced from clean and
fresh field coagulam or from unsmoked
TSR 10 has good technological
properties similar to those of RSS2 and
RSS3, but has the advantage over RSS from
(1) lower viscosity and (2) easier mixing
characteristic(slightly more rapid
breakdown) as well as being technically
specified and packed in modern packing.
•Tyres, inner tubes
•Cushion gum stocks
•Joint rings by injection moulding
•Microcellulor sheets, for packing,
•Conveyor belts and foot wears.
It is a large volume grade of technically
specified natural rubber. It is produced mostly from
field coagulam, with lower grades of RSS and or
TSR20 has excellent processing characteristics
and good physical properties. Its low viscosity and
easier mixing characteristic(compared with the RSS
grades) will reduce the mastication and mixing period
•Cushion gum stock
sheet for upholstery and packing
•conveyor belts, foot wear and
other general products.
It is the lowest grade of TSR and is produced
from old dry field coagulam or partly degraded rubber.
The rubber usually will be having low viscosity and
easier mixing characteristics compared with lower
grades of RSS, ESC and remilled crepes.
Can be used for
•Producing camel back
•Low quality foot wears
Advantages over the sheet and crepe grades of
• Being available in a limited number of well defined grades, correct
grades according to requirements by the consumers, is rather easy
• Being possible to assess the actual content of foreign and volatile
mistakes can be avoided in deciding the actual worth of the material.
• Being marketed as compact, polythene wrapped bales, degradation of
rubber on storage, handling and transportation can be prevented
• Being in standard size and compact, considerable savings can be made
transport through mechanised handling and containerisation