Kumminöör RS

Description
Product group: RS cord

Materials:
NBR, NB 70
FKM,  FP 75
EPDM (peroxide-cured), EP 70

Colour:
NBR 70, black
FKM 75, black
EPDM 70, black

Tolerances:
NBR, ISO 3302-1 E1
FKM, ISO 3302-1 E1
EPDM, ISO 3302-1 E1

Operational application limits
Temperature NBR: -35 °C to +100 °C
Temperature FKM: -15 °C to +200 °C
Temperature EPDM 70: -55 °C to +150 °C

Function
Cords are extruded as open-ended billets of circular cross-section (like an O-ring). The cord achieves its sealing effect by the deformation of its cross-section once installed, on being compressed within the installation housing. Under operational conditions, the pressure exerted by the medium reinforces the sealing function.

Applications
The primary application for cords is as the basic material for joined O-rings. They are similar to the O-ring in the way they are handled and applied. They are used as static seals, e.g. for sealing larger pipe unions and as cover seals in container construction. Cords are frequently used for on-site repairs, being joined together to provide the "customized" dimensions.

The process of end-joining cords to form a joined O-ring can be undertaken using cyano-acrylate or 2-component adhesives. However, for applications in seawater or other more demanding applications, bonding by means of an end-vulcanisation process is required.
Suitability for specific media NBR
Good chemical resistance to mineral oils and greases, hydraulic oils H, HL, HLP, non-inflammable hydraulic pressure fluids HFA, HFB, HFC to approx. +50°C and water to max. +80°C
Suitability for specific media EPDM
Good resistance to hot water and steam, detergents, caustic potash solutions, silicone oil and greases, many polar solvents, and many diluted acids and chemicals, along with a high level of ozone resistance. EPDM materials are totally unsuitable for use with all mineral oil products (lubricants, fuels).

Suitability for specific media  FKM
Good chemical resistance to mineral oils and greases, synthetic oils and greases, engine, transmission and ATF oils to approx. +150°C, fuels, non-flammable hydraulic pressure fluids HFD, aliphatic, aromatic and chlorinated hydrocarbons, water to max. +80°C, excellent resistance to weathering, ozone and ageing, very low gas permeability (and therefore excellent for vacuum application) and resistance to a wide range of chemicals.