L. D. COLLEGE OF ENGINEERING

RUBBER TECHNOLOGY

Sub:- n.r.s.t.(natural rubber science & technology)

1

Name:-Yogesh Malani

Topic:-TSRs(Technically Specified Rubbers)

2

IndexDefinitionTypes of TSRsTSR-CV

--General Characteristics--Uses

TSR-L--General Characteristics--Uses

TSR-5--General Characteristics--Uses

TSR-10--General Characteristics--Uses

TSR-20--General Characteristics--Uses

TSR-50--General Characteristics--Uses

Advantages over the sheet and crepe grades of rubbers 3

Definition

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 prevents contamization.

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 inproduction 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 aredesignated as Indian Standard Natural Rubber(ISNR).

4

Types of TSRs

The international standards Organization(ISO) have specified 6 different grades of Technically Specified Rubber.

TSR-CV

TSR-L

TSR-5

TSR-10

TSR-20

TSR-50

5

TSR-CV

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.General Characteristics:-

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 rejects.

6

TSR-CV

Uses:-• Mechanical mountings for engineand machinery•Bridge bearings/inner tubes and cement•conveyor belt covers•Low density sponge•Injection moulded products including rubber/metal bondedComponents.

7

It is a light colour rubber produced from high quality latex, having low ash and dirt content .General characteristics:-

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.

TSR-L

8

TSR-L

Uses:-•Rubber Bands•Gas masks•Bicycle tubes•Textiles and paper printing industry•Chewing gum•Tennis balls•Adhesive solutions and tapes.

9

TSR-5

It is produced from fresh coagulam and or from unsmoked sheets, Ribbed smoked sheets and Air dried sheets.

General Characteristics:-

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.

10

TSR-5

Uses:-•General purpose friction and extruded products•Small components in passenger vehicles•Brake seals•Adhesives•Plant linings•Resilient bush/mountings •Sealing rings,•Cushion gum

11

TSR-10

TSR 10 is produced from clean and fresh field coagulam or from unsmoked sheets.General characteristics:-

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 mixingcharacteristic(slightly more rapid breakdown) as well as being technically specified and packed in modern packing.

12

TSR-10

Uses:-•Tyres, inner tubes•Cushion gum stocks•Joint rings by injection moulding•Raincoat proofings•Microcellulor sheets, for packing,•Conveyor belts and foot wears.

13

TSR-20

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 unsmoked sheets.

General Characteristics:-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 considerably.

14

TSR-20

Uses:-•Tyres•Cushion gum stock•Bicycle tyres•Raincoat proofings•Microcellularsheet for upholstery and packing•conveyor belts, foot wear andother general products.

15

TSR-50It is the lowest grade of TSR and is produced

from old dry field coagulam or partly degraded rubber.

General characteristics:-

The rubber usually will be having low viscosity and easier mixing characteristics compared with lower grades of RSS, ESC and remilled crepes.

16

TSR-50

Uses:-Can be used for

•Producing camel back•Low quality foot wears •Black mouldedarticles etc.

17

Advantages over the sheet and crepe grades of rubbers

• Being available in a limited number of well defined grades, correct choice ofgrades according to requirements by the consumers, is rather easy• Being possible to assess the actual content of foreign and volatile matter,mistakes can be avoided in deciding the actual worth of the material.• Being marketed as compact, polythene wrapped bales, degradation of therubber on storage, handling and transportation can be prevented• Being in standard size and compact, considerable savings can be made intransport through mechanised handling and containerisation

18

19