A general overview on material usage applications:
SBR [Styrene Butadiene]
SBR is a synthetic elastomer suitable for low to medium duty applications involving air, water and diluted mixtures for economic, general purpose applications.
NR [Natural Rubber]
Natural rubber compounds display high abrasion resistance with excellent resilience, and exhibit good tensile strength, elongation, tear strength and mechanical properties. It is highly flexible and has good low permanent set qualities. It is not recommended on higher temperature applications.
CR [ Chloroprene ] - Neoprene
Neoprene is a popular multi-purpose material suitable for applications involving weathering, sea water, mineral oils, greases, dilute acids and alkalis. It is not recommended for fuel immersion (see Nitrile) and also exhibits good natural flame retardant properties dependent on polymer content.
NBR [Nitrile Butadiene] - Nitrile
Nitrile has excellent resistance to petroleum oils, aromatic hydrocarbons, mineral oils and many acids. It exhibits good elongation, resilience, tensile and compression set properties.
EPDM [Ethylene Propylene]
EPDM materials have excellent resistance to water [fresh & Sea], oxidation, ultra violet light, ozone and weathering. It also exhibits good temperature resistance at high and low temperature and has a natural resistance to acids, water based chemicals and vegetable based hydrocarbons. EPDM However is not recommended for use with mineral oils and di-ester based lubricants.
IIR [Isobutylene ] - Butyl
Butyl compounds have very high impermeability to gases, ozone, ultra violet light and weathering. It has high chemical and acid resistance and is particularly good with applications where high and low temperatures prevail.
Hypalon has outstanding resistance to most chemicals and oils at high and low temperatures. It also exhibits excellent weathering and abrasion resistance with low moisture absorption and good dielectric properties.
The outstanding performance of silicone rubbers resides in their resistance ability at high and low temperature without failure. Typical applications include oven door seals, glazing seals, gaskets and sealing washers. It also has excellent flame retardant characteristics and some grades can be used in contact with food and drink and carry the relevant FDA and WRAS approvals.
FKM [Fluoroelastomer & Viton®]
Fluoroelastomer [including Viton®] are materials designed for very high operating temperatures, in particular applications in excess of 200º C. They have outstanding resistance to chemical attack by oxidation and corrosive fluids, and can retain their mechanical properties under such extremities.
CNAF [Compressed non asbestos fibre] and Graphite
CNAF materials offer viable alternatives to the now discontinued asbestos based products. A different variation is available to suit most applications previously covered by asbestos based materials.
CORKS - BONDED [Cork granules bonded with polymers]
The natural properties of cork, in particular the compressibility and recovery properties make it an ideal option for sealing and gasket applications. These properties combined with a range of elastomeric compounds make it resistant to many influences and suitable for many industrial applications.
PTFE exhibits unique physical characteristics and achieves almost universal chemical resistance. It is insoluble in all solvents below 300ºc with good high temperature service stability at 250ºc and low temperature resistance at 200ºc. It has an extremely low co-efficiency of friction and excellent low stick values. PTFE is also non-flammable, weather resistant and can be used in food and drinks applications.
PU [ Polyurethane]
The ultimate material for demanding applications such as abrasion, resilience, wear resistance and tear strength with good resistance to ozone and oxygen. It also exhibits low co efficiency of friction values.
Please contact us for confirmed suitability on applications if you are unsure.
The above data is evaluated on base content polymer compounds only; allowances should be made for blended compounds and in particular on economy and commercial quality grades where full polymer content is not stated or possibly reduced. (Caution should always be exercised when using blended compounds and we recommend that all materials falling into these categories should always be tested.) As such any offered materials are subject to Coruba clients determination of suitability.
Wherever possible, Coruba is prepared to submit samples, material data sheets, test reports and any further information required on any of our standard materials.
Unfortunately we are unable to give any firm recommendations on economy grade materials containing reclaimed crumb materials.