winlas

Elastomers

NR : NATURAL RUBBER

SBR : STYRENE BUTADIENE RUBBER

CR : CHLOROPRENE RUBBER

NBR : NITRILE RUBBER

EPDM : ETHYLENE RUBBER

CSM : CHLOROSULPHONATED POLYETHYLENE RUBBER

VMQ : SILICONE RUBBER

FKM : FLUOROCARBONATED RUBBER

CO/ECO : EPICHLOROHYDRIN RUBBER



NR - NATURAL RUBBER

Natural Rubber is obtained from the robbar tree. Of the many existing species, only 'Hevea Brasiliensis', which originated in the Amazan 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 properlies, such as tensi/e strenght, elasticity and tear resistance.
    • * Wide range of hardnesses, from 35 to 90 Shore A.
    • * Wide range of hardnesses, from 35 to 90 Shore A.
    • * Excellent electrlcal 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 haff of the synthetic nıbber produced in the world is SBR. lt 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 properlies of elasticity and resistance to low temperatures white at the same time increasing hardness.

    Properties
    • * lt requires reinforcing fillers to attain good mechanical properties, and can achieve higher abrasion resistance than natural rubber.
    • * Similiar to natural nıbber, but with batter ageing and temperature resistance.
    • * Lower resilience compared to natural rubber.
    • * Moderate tearing, ozone and weather resistance.
    • * Temperature range -50 to 110 C.


    CR - CHLOROPRENE RUBBER

    lt offers the most balanced set of desirable properlies. The chforine atom increases the level of resistance to oils, placing it between natural nıbber and nitrife rubbber.

    Properties
    • * Excellent abrasion resistance and superior mechanical properties.
    • * lnferior resilisnce than naural nıbber in low hardnesses, but higher from hardnesses of 60 Shore A upwards.
    • * lt presenis 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 flexibiliyat low temperature are reduced.

    Properties
    • * Resistance to oils, and can be formulated for applications at relatively high temperatures.
    • * Good mechanical properlies, such as traction, compressian and flexion.
    • * lmpermeable to gases.
    • * Ageing is moderate.
    • * Good adhesion to metal.
    • * Moderate resistance to low temperature, allowing it to reach temperatures as law as -40 Celsius thanksto the use of adequate plastffiers.
    • * 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 possib/e 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 electrlcal properlies and radiation stability.
    • * Moderate adhesion to metal.
    • * Temperature range -45 to 120 Celsius. May be formulated for continuous servicesat 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.
    • * Seff-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

    lt is known as fluorelastomer rubber. lts chemical resistance, and its resistance to low and high temperatures are directly propotional to its fluorine content.

    Properties
    • * Extraordinary high temperature resistance. Continuously up to250 Celsius and intermittently up to 300 Celsius.
    • * Extraordinary chemical resistance.
    • * Self-extinguishable.
    • * Excellent ozone and weather resistance.
    • * Low deformation on compresian at high temperature.
    • * Satisfactory resistance to law 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 resistant.
    • * Excellent elastic properties.