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Latex is the thin stretchy material obtained by processing the sap of rubber plants. It can also be made synthetically by polymerizing a monomer that has been emulsified with surfactants. Requirements of ISO 2004 for centrifuged and creamed natural rubber latex concentrate

( ¹ ) Optional requirement.
( ² ) Difference between total solids and dry rubber content.
( ³ ) Higher minimum values of mechanical stability may be agreed between the
   interested parties if desired.
( * ) Based on total solids.
( ° ) After neutralization of ammonia with boric acid.

   
   
  Among these forms types, the first three are in the dry form and almost of the total NR produced in the world is at present marketed in these 3 forms.  
 
   
Sheet Rubber   Crepe Rubber   T.S.R
         
       
Preserved Latex        
 
     
 
  Centrifuged
  HA LA
Total solids content, %, minimum¹ 61.5 61.5
Dry rubber content, %, minimum 60.0 60.0
Non-rubber solids, %, maximum² 2.0 2.0
Ammonia, % on latex 0.6 0.29
  minimum Maximum
Mechanical stability, s, minimum³ 650 650
Coagulum content, %, maximum 0.05 0.05
Copper, ppm, maximum* 8 8
Manganese, ppm, maximum* 8 8
Sludge content, %, maximum 0.10 0.10
Volatile fatty acid (VFA) number As agreed between the interested parties
but not to exceed 0.2
KOH number As agreed between the interested parties
but not to exceed 1.0
Colour No pronounced blue or grey
Odour° No pronounced odour of putrefaction

The various types of latex:
   
 

High Ammonia Latex Concentrate (HA Latex)

HA Latex is also known as Standard Ammonia, High Ammonia or Full Ammonia. It is a natural rubber latex concentrate obtained by centrifugation and preserved with a high amount of ammonia. It is the most common grade of latex used worldwide. It gives excellent films of high clarity and has good adhesion characteristics as a binding agent when suitably compounded. HA Latex, after compounding, has a wide application especially in dipped products like medical or industrial gloves, rubber thread, balloons, prophylactics (condoms), tubing, finger cots, etc. It is also used as an adhesive for footballs, adhesive for bandages, castings on to a backing substrate, in wood lamination and for binding different types of materials. HA Latex is packed in non-returnable, internal-lined metal drums of net weight 205kg or delivered in larger bulk quantities using appropriate tanks.

 

Low Ammonia Latex Concentrate (LATZ Latex)

LATZ Latex is the most common type of Low Ammonia Latex preserved in small amount of TMTD and Zinc Oxide. A natural rubber latex concentrate obtained by centrifugation and preserved with a low amount of ammonia, it is general purpose latex widely used in many latex applications like foams, dipping, castings and adhesive bindings. It is more commonly used in colder climates where the factory floor is enclosed to maintain temperature and thus the lower level of ammonia content is desirable.

LATZ Latex, after compounding, has a wide application especially in dipped products like gloves, foam mattresses, reconstituted/reclaimed leather, balloons, shoe soles, mats etc. It is also used as an adhesive for casting on to a backing substrate, in wood lamination and for binding different types of materials.

 

Skim Block

Skim block is a by-product of latex production. Usually sold at a substantial discount to the price of TSR 20, it is a light colored clean rubber, commonly used for rubber toys, rubber parts, rubber sheet, conveyor belts and shoe soles. It is suitable for products where the tear strength of the rubber is not critical.

We deal with all other grades of latex, like Medium Ammonia Latex, Double Centrifuged Latex, TSR CV and TSR L of multi-origin, prevulcanized latex, low protein latex concentrate, PA80 and SP50.

 

Peptized rubber

This rubber is prepared by adding a small quantity of a softening agent or peptizer to latex which is then coagulated and made into sheet or crepe. It has the advantage that it can be easily broken down to a suitable plasticity as a first step in the manufacture of rubber particles.
 
DPNR(Deprotinized Natural Rubber)
  Deprotinized Natural Rubber (DPNR) is a purified form of natural rubber from which most of the ash and protein components have been removed. The rubber is produced under very closely controlled. It contains about 96% rubber hydrocarbons compared to about 93% for normal natural rubber grades. The removal of these non rubber components confers special attributes to the rubber which enhance its value in certain specialized applications.

Two principle grades of DPNR are available, they are;
    • DPNR CV (viscosity stabilized at between 60-70 Mooney units).
    • DPNR-S (no viscosity stabilized feature. The initial viscosity is between 70- 80 Mooney units. Owing to the reduction in non rubber content, the DPNR S has a very much less storage hardening than the normal NR).

 

Synthetic Rubber

Synthetic rubber is any type of artificially made polymer material which acts as an elastomer. It can undergo much more elastic deformation under stress than most materials and still return to its previous size without permanent deformation. Synthetic rubber serves as a substitute for natural rubber in many cases, especially when improved material properties are needed. It is now an essential component in tyres manufacturing.

 

Styrene Butadiene Rubber (SBR)

SBR is predominantly used for the production of car and light truck tires and truck tire retread compounds. A complete list of the uses of SBR includes house ware mats, drain board trays, shoe sole and heels, chewing gum, food container sealants, tires, conveyor belts, sponge articles, adhesives and caulks, automobile mats, brake and clutch pads, hose, V- belts, flooring, military tank pads, hard rubber battery box cases, extruded gaskets, rubber toys, molded rubber goods, shoe soling, cable insulation and jacketing, pharmaceutical, surgical, and sanitary products, food packaging, etc.

 

Nitrile Butadiene (NBR)

NBR is a form of synthetic rubber is generally inferior in strength and flexibility but has high level of resistance to oil, grease, fuel, and other chemicals. Its resilience makes NBR the perfect material for disposable lab, cleaning, and examination gloves. In the automotive industry, it is used to make fuel and oil handling hoses, seals and grommets. NBR’s ability to withstand a range of temperatures from -40°C to +120°C makes it an ideal material for extreme automotive applications. It can also be used to create molded goods, footwear, adhesives, sealants, sponge, belting and floor mats.

 

Poly Butadiene

Poly Butadiene is a synthetic rubber that has a high resistance to wear and is used especially in the manufacture of tyres. It has also been used to coat or encapsulate electronic assemblies, offering extremely high electrical resistivity. It exhibits a recovery of 80% after stress is applied, a value only exceeded by elastin and resilin.

The major use of polybutadiene is in tyres with over 70% of the polymer produced going into treads and sidewalls. Cured BR imparts excellent abrasion resistance (good tread wear), and low rolling resistance (good fuel economy). Polybutadiene is usually blended with other elastomers like natural rubber or styrene-butadiene rubber for tread compounds. Other applications include polystyrene for injection molding applications and golf balls.

 

Poly Isoprene

Though Poly Isoprene has lower strength, hot tear and aged properties and slower cure rates than natural rubber, it is superior in mixing, extrusion, molding and calendaring processes. It is widely used in applications where such conditions are required - low water swell, high gum tensile strength, good resilience, high hot tensile and good tack.

Most common applications include rubber bands, baby bottle nipples, extruded hose, footwear and sporting goods. It can be found in tyres, motor mounts, gaskets, shock absorber bushing set.

Poly Isoprene can also be adapted for curing in molding activities. Its uniform cure rate enables the establishment of exact time/temperature press cycles.

 

Butyl

Because of butyl polymers’ unique characteristics, barrier properties - high damping, resistance to ozone, heat and chemical and very low permeability to air, gases and moisture, butyl is ideal for many tyres and automotive applications, healthcare and medical equipments, industrial and construction usage and adhesive and even chewing gum! Butyl rubber is, in fact, the only rubber that is impermeable to air.

In the tyres and automotive industries, butyl polymers can be used for inner liner, non staining black sidewall, white sidewall, treading compound, heat resistant hose and dynamic parts including the body mounts. In medical industry, it can be found in protective clothing and closures for bottles.

It is also used in tank linings, conveyors belts and condenser packing. Added to asphalt compositions, it improves the weathering and low temperature properties of asphalt, increase toughness, impact and abrasion resistance. It is used extensively in manufacturing of roofing materials.

 

EPDM (Ethylene-Propylene-Diene-Monomers)

EPDM rubber (ethylene propylene diene rubber) is an elastomer which is characterized by wide range of applications. EPDM rubber is used in automotive weather-stripping and seals, radiators, garden and appliance hose, tubing, washers, belts, electrical insulations, roofing membrane, geo-membranes, rubber mechanical goods, plastic impact modification, thermoplastic vulcanizates, motor oil additive applications.

 

Silicone Rubber

Silicone Rubber is used in mechanical engineering like shaft sealing rings, spark plug caps, radiator and automotive heating hoses, O-rings, corona and embossing roller gaskets, window and door seals, expansion joints etc. It is also used in electrical engineering application, for cables and cable terminations, corona-resistant insulation tubing, keyboards and contact mats, conductive profiled seals.

Its usage in medical applications includes tubing for dialysis and transfusion equipment, bellows for artificial respirators, catheters, dummies for babies.

 

Neoprene Rubber / Polychloroprene Rubber

Neoprene rubber is one of the best all-purpose elastomers where resistance to ozone, sunlight, oxidation and many petroleum derivatives are of prime importance. Its added advantages include good resistance to water, many chemicals, good resilience characteristics and tensile strength properties. It is often found in moulds and extruded rubber products.

 

Special-purpose rubber

We also trade in special-purpose rubbers such as Polyacrylic rubber (ABR), Epichlorohydrin rubber (ECO), Polysulfide Rubber Chlorosulfonated Polyethylene (CSM).