Rubber
SGT is the premier stockist and trader of Natural/ Synthetic Rubber and rubber products
in the Middle East. We source rubber and have excellent relationships with the best
rubber manufacturers in the world.
SGT deals in:
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Natural Rubber
Natural Rubber (NR) is produced from latex obtained from rubber trees in plantations.
The outstanding strength of natural rubber has maintained its position as the preferred
material in many engineering applications. It has a long fatigue life and high strength,
even without reinforcing fillers. Other than for thin sections, it can be used to
approximately 100°C, and sometimes above. It can maintain flexibility down to -60°C
if compounded for the purpose. It has good creep and stress relaxation resistance
and is low cost. The most important forms in which NR is processed are the following:
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Rubber Sheets
Two types of Sheet Rubber are produced and marketed in the international market,
namely the Ribbed Smoked Sheets (RSS) and the Air Dried Sheets (ADS). Among these
two types, Ribbed Smoked Sheet is the most popular and is available for consumption.
There exist different grades of Ribbed Smoked Sheets rubber, namely RSS 1, RSS 2,
RSS 3, RSS 4 and RSS 5.
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Ribbed Smoked Sheet (RSS)
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Grade
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Technical Specification
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Areas of Consumption
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RSS1
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Dry, clean, strong, sound and evenly smoked. Free from moulds, blemishes, specks,
rust, blisters, sand, etc. Slight specks might be seen
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Tubes
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RSS2
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Dry, clean, strong, sound and evenly smoked. Free from moulds, blemishes, specks,
rust, blisters, sand , etc.
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Extruded Hoses, Quality Footwear Items, Tyres, Tubes, Tread Carcasses
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RSS3
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Dry, strong and free of blemishes, blisters, sand, dirty packing, etc
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Tyre and ADV Tyres, Extruded Hoses, Footwear
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RSS4
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Dry, firm and free of blemishes, blisters, sand, etc. to the extent shown in samples
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Tyre and ADV Tyres, Extruded Hoses, Footwear
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RSS5
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Dry, firm and free of blemishes to the extent shown in samples
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Hand made Hoses,Re treading Materials
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Ribbed Smoked Sheet (RSS) is marketed based on visual assessment of quality. Grading
of RSS is done based on the grade descriptions and specifications defined in the
'The Green Book" of International Rubber Quality and Packing Conferences as RSS1,
RSS2, RSS3, RSS4, and RSS5. RSS of superior quality are processed from fresh field
latex, adopting modern processing methods.
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Blocked Rubber
TSR is processed natural rubber in block forms, adopting cost-effective and modern
processing methods as per the technical parameters laid down by the International
Standards Organization (ISO). It is a state-of the- art marketable form of natural
rubber, produced from latex and field coagulum. TSR is marketed in six well defined
marked grades with uniformity and consistency in quality, to meet the requirements
of global consumer. The standard sizes and compact packing enables mechanized handling
and containerization, thereby making the transportation trouble free and economical.
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TSR CV
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TSR L
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TSR 5
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TSR 10
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TSR 20
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Parameter
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5 CV
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XL
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5L
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5
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10
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10CV
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TSR 20
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TSR 20CV
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Dirt (% wt, max)
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0.04
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0.02
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0.04
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0.04
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0.08
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0.08
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0.16
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0.16
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Ash (% wt, max)
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0.60
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0.40
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0.40
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0.60
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0.60
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0.60
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0.80
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0.80
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Nitrogen (% wt, max)
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0.60
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0.50
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0.60
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0.60
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0.60
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0.60
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0.60
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0.60
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Volatile Matter (% wt, max)
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0.80
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0.80
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0.80
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0.80
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0.80
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0.80
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0.80
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0.80
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Initial Plasticity (min)
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NA
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35
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35
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30
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30
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NA
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30
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NA
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PRI index (min)
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60
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60
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60
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60
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50
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50
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40
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40
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Colour Lovibond Scale(individual value, max)
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NA
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4.0
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6.0
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NA
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NA
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NA
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NA
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NA
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Mooney Viscosity**(ML, 1+4, 100°C)
|
60+7/-5
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NA
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NA
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NA
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NA
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60+7/-5*
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NA
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65+7/-5*
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Grade
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Technical Specification
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Areas of Consumption
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TSR CV
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Produced from good quality field latex and is viscosity stabilized at a narrow range
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High quality products with superior dynamic properties. Tyres, Injection Bottle
Caps, Adhesives.
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TSR L
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Produced from good quality field latex
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Transparent Products, Injection Bottle Caps, Syringe Heads. Large Industrial Rollers.
Aero Tyros, Hot Water Bottles, Adhesive Solutions, Sports Footwear, Tennis Balls
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TSR 5
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Produced from field latex or high quality field coagulum
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Moulded and Extruded products like Auto components, Engine Mountings, Bridge Bearings,
Rubber Linings, Conveyor Belts, Tubes, Engine Mountings, Tank Linking, Brake Seals,
Hoses
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TSR 10
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Produced from high quality field coagulum
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Cushion Gum Stocks, Joint Rings by Injection Molding, Raincoat Proofing, Micro Cellular
Sheets for Upholstery and Packing, Conveyer Belts, Footwear, Tyre Tread Materials
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TSR 20
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Tailor made grade of rubber, produced from quality field coagulum
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All types of Automotive Tyres and Re treading Material, Bicycle Tyres, Raincoat
Proofing, Micro Cellular Sheets for Upholstery and Packing, Conveyor Belts, Footwear,
Mats
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Latex Concentrates
Processing of natural rubber latex into high quality latex concentrate of 60% dry
rubber content is done through centrifugation. Centrifuging involves the separation
of preserved field latex into two fractions, one containing the concentrated latex
of more than 60% dry rubber and the other containing 4-6% dry rubber. Centrifuged
latex is today available commercially in two different verities with high ammonia
(min.0.6% of ammonia) and low ammonia (max. 0.3% of ammonia). The former is preserved
solely with ammonia and later contains one or more preservatives besides ammonia.
LA latex has several advantages which include better quality, lower cost of production
by way of savings in preservatives, acid and low cost of effluent treatment.
Grade & Applications:
- High Ammonia (HA) - Foam products, dipped goods, adhesives, elastic thread, household
and industrial gloves, balloons, rubber bands and finger caps.
- Low Ammonia (LATZ) - Preferred for all applications when de ammonia is necessary
for product manufacture.
- Double Centrifuged - High technology dipped products such as condoms, examination
gloves, surgical gloves, catheters etc.
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Natural Rubber Plantation
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Synthetic Rubber
Synthetic rubber is processed and vulcanized in the same way as natural rubber.
Synthetic rubber is produced in different ways. Synthetic rubbers are artificially
produced materials with properties similar to natural rubber. Most are obtained
by polymerization or polycondensation of unsaturated monomers. A wide range of different
synthetic rubbers have emerged, reflecting the various different applications and
the chemical and mechanical properties they require. Co-polymerization of different
monomers allows the material properties to be varied across a wide range.
Polymerization can take place under hot or cold conditions, which result in hot
polymers (hot rubber) or cold polymers (cold rubber). Synthetic rubbers are marketed
as compressed bales and square blocks. They are also produced in the form of powder
rubber, talcum-coated chips, granules and as latex concentrates in liquid form.
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Quality
The benefits compared with natural rubber include better oil and temperature resistance
and the possibility of a product with an extremely constant quality. Synthetic rubbers
made from butadiene (polybutadiene copolymers) rank as the most important synthetic
rubbers produced.
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Grades
The following list indicates some of the most important synthetic rubbers along
with their properties in comparison with natural rubber.
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Styrene butadiene rubber (SBR)
General purpose rubber made up of different types; better abrasion resistance, lower
elasticity, poorer low-temperature behavior, better heat and aging resistance, excellent
electrical insulation material similar to rubber.
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Polybutadiene rubber (BR)
Poor processing properties mean that BR is not used on its own, blended with SBR
or NR, abrasion-resistant, good elasticity, flexible at low temperatures
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Isoprene rubber (IR)
Properties largely comparable with natural rubber, more uniform, cleaner, transparent.
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Acrylonitrile butadiene rubber (NBR)
Oil and fuel resistant, good heat distortion temperature properties, abrasion resistant
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Chloroprene rubber (CR)
Flame retardant, resistant to grease, oil, weathering and aging, abrasion resistant
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Butyl rubber (IIR)
Low permeability to gases, resistant to aging, ozone and chemicals, good mechanical
properties, abrasion resistant, good electrical insulation properties.
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Storage
Duration of storage varies depending on the type of synthetic rubber. For example,
a range of 6 - 36 months if the ideal conditions recommended by the manufacturer,
such as a storage temperature between 10 and 25°C, are observed. Synthetic rubber
must be stored dry, some synthetic rubbers must be stored cool and they are to be
protected from direct sunlight. Recommended storage duration for synthetic rubber,
in particular SBR:
- Initial storage 5 years
- Extended storage 2 years
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Uses
Like natural rubber, synthetic rubber has a wide range of applications, such as
in the tire industry (car, aircraft and bicycle tires), drive belts, hoses, medical
equipment, seals, floor coverings, conveyor belts, and molded parts.
The following list shows the operating temperatures and applications for some important
types of synthetic rubber.
- Styrene butadiene rubber (SBR)
-40 to 100°C
Tire industry (treads and carcasses), conveyor belts, seals, technical rubber products
- Polybutadiene rubber (BR)
-80 to 90°C
Tires, conveyor belts, clutches, engine bearings, technical products of all types,
drinking water seals
- Isoprene rubber (IR)
-40 to 130°C
Technical products of all types, especially construction sections, cooling and heating
hoses for vehicles, high-performance tires, foodstuffs utensils
- Acrylonitrile butadiene rubber (NBR)
Operating temperature: up to approx. 110°C
Motor vehicle parts, oil and fuel hoses, technical products of all types, plates
and mats, rollers, seals and for foodstuffs such as milk
- Chloroprene rubber (CR)
-40 to 110°C
Conveyor belts, clutches, drive belts, technical products of all types, pneumatic
suspension systems, cables
- Butyl rubber (IIR)
-40 to 150°C
Automotive hoses, tire inner liners, seals, membranes, rubberized fabrics, steam
hoses, cable insulation
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