ELASTOMERS		  
 
   
NR Natural Rubber
SBR Styrene-Butadiene Rubber
CR Chloroprene Rubber (Neopren)
NBR Nitrile Rubber
EPDM Ethylene Propylene Diene Monomer Rubber
CSM Chlorosulphonated Polyethylene Rubber ( Hypalon)
VMQ Silicone Rubber
FKM Fluorocarbonated Rubber ( Viton)
CO/ECO ECO Kauçuk
 
     
     
  NR - NATURAL RUBBER  
     
  Natural Rubber is obtained from the rubber tree. Of the many existing species, only 'Hevea Brasiliensis',which originated in the Amazon region, is commercially exploited. Because of its natural origin, it is not a homogenous product, but even so it is classified in different grades according to visual and analytical evaluation criteria.

Properties

* Excellent mechanical properties, such as tensile strenght, elasticity and tear resistance.
* Wide range of hardnesses, from 35 to 90 Shore A.
* High resilience, excellent dynamic properties and low compression set.
* Excellent electrical properties.
* Sensetive to ozone. Weather resistance can be improved adding antiozonants combined with waxes.
* Temperature range -50 to 90 Celsius.

 
     
     
  SBR - STYRENE-BUTADIENE RUBBER  
     
  More than half of the synthetic rubber produced in the world is SBR. It is synthesised from raw materials derived from oil. SBR contains approximately % 23 of styrene. Any increase in this content leads to the deterioration of its properties of elasticity and resistance to low temperatures while at the same time increasing hardness.

Properties

* It requires reinforcing fillers to attain good mechanical properties, and can achieve higher abrasion resistance than natural rubber.
* Similiar to natural rubber, but with better ageing and temperature resistance.
* Lower resilience compared to natural rubber.
* Moderate tearing, ozone and weather resistance.
*Temperature range -50 to 110 Celsius.		  
     
     
  CR - CHLOROPRENE RUBBER  
     
  It offers the most balanced set of desirable properties. The chlorine atom increases the level of resistance to oils, placing it between natural rubber and nitrile rubber.

Properties

* Excellent abrasion resistance and superior mechanical properties.
* Inferior resilience than naural rubber in low hardnesses, but higher from hardnesses of 60 Shore A upwards.
* It presents good temperature and ozone resistance.
* Flame retartant.
* Good adhesion to metal.
* Temperature range -25 to 125 Celsius.
  
     
     
  NBR - NITRILE RUBBER  
     
  Depending on the acrylonitrile content (ACN), they can be classified as Low ACN ( 18-24%),Medium ACN ( 34%) and High ( 50%) content. By increasing the ACN content :
* Resistance to oils, fuel increases.
* Tensile strenght, resistance to abrasion, hardness, temperature resistance and impermeability are improved.
* Resilienece and flexibiliy at low temperature are reduced.

Properties

* Resistance to oils, and can be formulated for applications at relatively high temperatures.
* Good mechanical properties, such as traction, compression and flexion.
* Impermeable to gases.
* Ageing is moderate.
* Good adhesion to metal.
* Moderate resistance to low temperature, allowing it to reach temperatures as low as -40 Celsius thanksto the use of adequate plastifiers.
* Temperature range -30 to 120 Celsius.		  
     
     
  EPDM - ETHYLENE RUBBER  
     
  The copolymers of Ethylene and Propylene (EPM) can only be vulcanized by peroxides or radiation,whereas by adding Diene (EPDM) it is possible to achieve conventional vulcanization with sulphur,thereby increasing their resistance to tearing.

Properties

* Excellent resistance to ageing, ozone, ultraviolet light, and practically unalterable by weather.
* Excellent electrical properties and radiation stability.
* Moderate adhesion to metal.
* Temperature range -45 to 120 Celsius. May be formulated for continuous services at 140 Celsius.		  
     
     
  CSM - CHLOROSULPHONATED POLYETHYLENE RUBBER  
     
  Properties

* Excellent oxidation, weather and ozone resistance.
* Excellent resistance to hydrocarbonated solvents.
* Flame resistance.
* Moderate adhesion to metal.
* Temperature range -35 to 140 Celsius.
  
     
     
  VMQ - SILICONE RUBBER  
     
  Unlike the rest of synthetic rubbers, its moleculer chain does not contain carbon, consists of silicon and oxygen atoms.

Properties

* Excellent temperature resistance (200 to 220 Celsius) in dry environments. In contact with highpressurised steam (130-140 Celsius) or in case of ageing in closed systems without the presence of oxygen,degradation by hydrolsis may occur.
* Absolutely unalterable by ozone, weather and ultraviolet radiation.
* Good electrical insulator.
* Self-extinguishable. In case of complete combustion by prolonged contact with a flame, the residue (silica)is an excellent electrical insulator.
* Physiologically inert, suitable for medical applications.
* Temperature range -70 to 220 Celsius.		  
     
     
  FKM - FLUOROCARBONATED RUBBER  
     
 

It is known as fluorelastomer rubber. Its chemical resistance, and its resistance to low and high temperatures are directly proportional to its fluorine content.

Properties

* Extraordinary high temperature resistance. Continuously up to 250 Celsius and intermittently up to 300 Celsius.
* Extraordinary chemical resistance.
* Self-extinguishable.
* Excellent ozone and weather resistance.
* Low deformation on compresion at high temperature.
* Satisfactory resistance to low temperatures between -30 and -50 Celsius.

  
     
     
  CO/ECO - EPICHLOROHYDRIN RUBBER  
     
  Properties

* Excellent ozone and weather resistance as saturated polymers.
* COs withstand continuous service temperatures of up to 150 Celsius and are fragile from -23 Celsius.
* ECOS and ETHERS can support continuous service temperatures of up to 135 Celsius, and maintain their flexibility above -40 Celsius.
* Fire resistand.
* Excellent elastic properties.