Our standard materials
EPDM - ethylene-propylene-diene (monomer) rubber (-30 ° C to 150 ° C) *
EPDM is a TER polymer with few unsaturation points in the side groups. Due to the saturated main chain, EPDM shows good heat, ozone and aging resistance as well as high elasticity, good cold behavior and good electrical insulation properties.
EPDM is resistant to: glycol-based brake fluids up to 125 ° C, silicone oils and greases, many polar solvents (ketones, esters, alcohols), detergents, sodium and potassium hydroxide solutions, hot water and superheated steam up to 125 ° C *, HFC and mineral oil-free HFD -R hydraulic fluid.
EPDM is not resistant to: Mineral oil products (oils, greases and fuels), aliphatic, aromatic and chlorinated hydrocarbons.
VMQ - silicone rubber (-60 ° C to + 200 ° C) *
This material is characterized by its very high resistance to heat, weather, aging and ozone. In addition, silicone has good electrical insulation properties that are constant in a temperature range from -60 to + 200 ° C.
A large number of silicone products are physiologically harmless and odorless and tasteless. Therefore, the material silicone is particularly suitable for use in connection with food, medical or pharmaceutical goods, so that these then comply with the relevant regulations of BfR u. FDA for food conformity to the requirements of WRAS, KTW u. ACS for contact with drinking water as well as the applicable provisions from ISO 10993, USP Class VI u. EP 3.1.9. for the medical / pharmaceutical sector.
Steam sterilization is possible several times at temperatures between 120 ° C and 140 ° C with many silicone qualities.
Silicone is not resistant to fuels, silicone oils and fats, acids and alkalis.
CR - Chloroprene (Neoprene) (-35 ° C to + 100 ° C) *
Neoprene is a synthetic butadiene-acrylonitrile-based rubber. It combines almost all the desirable properties of a rubber: medium oil resistance (better than natural rubber, but worse than nitrile rubber), good ozone and weather resistance, very good aging resistance (better than natural rubber, but worse than silicone and FKM), good mechanical properties and elasticity (but less good than natural rubber - smaller permanent deformation up to 70 ° C, at higher temperatures, however, greater than that of nitrile rubber).
Neoprene can be used in a temperature range from –35 to +100 ° C. Chloroprene (neoprene) is produced in more than ten variants, which is why it is characterized by such different properties. Neoprene rubber is used wherever items are exposed to weathering or where they come into sporadic contact with oil (cover sheet of hoses, inner rubber lining of compressed air hoses).
Source: https://www.gummischwarz.ch/Kundenupload/M1/downloads/Beschreibung_KuK.pdf
NR - natural rubber (-50 ° C to + 70 ° C) *
Natural rubber is an all-purpose rubber that can be found in almost all areas of application. NR has a very high tensile strength, elasticity, flexibility at low temperatures and excellent dynamic properties. NR shows moderate resistance to oil, heat, weather and ozone.
NBR - nitrile butadiene rubber (-25 ° C to + 100 ° C) *
NBR has a very good resistance to mineral oil and grease, as well as HFA, HFB and HFC hydraulic fluids, vegetable and animal oils and greases. In addition, NBR materials have good resistance to aliphatic hydrocarbons (propane, butane, gasoline and diesel fuel), as well as to silicone oils and greases. In addition, NBR is characterized by a low compression set.
NBR is not resistant to polar solvents, glycol-based brake fluids, overheated steam, aromatic hydrocarbons, chlorinated hydrocarbons, HFD pressure fluids, UV light and ozone.
HNBR - hydrogenated nitrile butadiene rubber (-30 ° C to + 140 ° C) *
In short, HNBR is the further development of the NBR. HNBR or highly saturated nitrile rubber is the name for a class of material that is obtained by selective hydrogenation (addition of hydrogen using a catalyst) of the butadiene groups of NBR. The hydrogenation gives good ozone and weather resistance. Wherever NBR reaches its limits, the higher-quality material HNBR is often used.
FKM (Viton®) - fluororubber (-25 ° C to + 220 ° C) *
Fluororubber or also known under the name Viton®. This material is characterized by its very high resistance to heat, weather, aging and ozone. In addition, the fluororubber has very good chemical resistance and low gas permeability. Fluororubber is sensitive to the effects of hot water, steam and amines, among other things.
FKM was developed in the USA in the 1950s and is now an important sealing material. Fluororubbers are copolymers made from highly fluorinated hydrocarbons. There are currently CO, TER or TETRA polymer types available with different structure and fluorine content and thus different media resistance and low temperature flexibility.
FFKM - perfluorinated rubber (-20 ° C to 325 ° C) *
Perfluor rubber (abbreviation FFKM or FFPM) or perfluoroelastomer is a fully fluorinated elastomer. Chemically, it is very similar to polytetrafluoroethylene (PTFE). It is mainly used where very good thermal and / or chemical resistance is required.
FFKM can be used between −20 ° C to +325 ° C. Special compounds (mixtures) can be used up to over +325 ° C or down to −30 ° C under certain conditions. The specification of the low temperature in particular relates to the static application.
Other materials available on request.
* Information relates only to general material information and is for guidance only. Temperatures vary greatly due to their different recipes and ingredients.