General features of the rubber compounds

MaterialInternational acronymElesa nameFeaturesColourOperating temperatureHardnessChemical resistanceApplications
Nitrileor oil-proof rubberNBRAHighly resistant to oils, heat, and ageing. Low permanent deformation. Good impermeability to air and gases. If left untreated, low resistance to ozone. Poor dielectric properties. Low resilienceBlackFrom -40 to +130°C60 ÷ 70°Shore AResistance to mineral and vegetable oils, hydrocarbons, gas, water, and steam.Excellent mechanical characteristics allow these vacuum cups to handle heavy loads and resist tears, crushing, and blows. They are suitable for gripping metal sheets, glass, and loads with smooth surfaces.
Natural rubberNRNExcellent elasticity and resistance to wear, cuts, and tears.BlackFrom -70 to +80°C45 ÷ 50°Shore AModerate resistance to sea water and medium concentration acidsThe flexibility of the compound allows grip on rough and irregular surfaces. They are suitable for wood, cardboard, marble, brick, glass, and plastic.
SiliconeVMQSExcellent performance at high and low temperatures. Conductive compound.Neutral whiteFrom -50 to +300°C40 ÷ 45°Shore AExcellent resistance to chlorinated substances, solvents, ozone, oxygen, and UV rays.They are widely used in the food packaging industry, in the electronic and pharmaceutical (medical) sectors where in general the surface temperature of the product is a fundamental parameter (very high temperatures or below 0°C).
Yellow natural rubberNRNGExcellent elasticity and resistance to wear, cuts, and tears.Natural yellowFrom -50 to +70°C40 ÷ 45°Shore AModerate resistance to sea water and medium concentration acidsThe greater flexibility of the compound allows grip on rough and irregular surfaces. They are recommended for gripping paper, cardboard, plastic, plastic films for packaging, etc.
Hydrogenated nitrile rubberHNBRBExcellent resistance to wear, ageing, oils containing chlorine, greases, and petrol. Low permanent deformation. It does not leave streaks on the gripping surfaces of the vacuum cups.RedFrom -40 to +170°C60 ÷ 75°Shore AResistance to mineral and vegetable oils, chlorine, hydrocarbons, gas, water, and steam.The high resistance to deformation allows these vacuum cups to handle heavy loads and resist strong stress such as tears, crushing, and blows.