KVT Pinch Sleeves

for directly operated pneumatic pinch valves (other dimensions and material combinations available on request)


KVT No. Material Trade name Material (Inside) Material (Outside) T max. [°C] E Remarks1)
NN Natural Rubber NR NR 80 * NN = Standard version NR: Very good mechanical and elastic properties, very good abrasion resistance. Medium resistance to seawater, acids and bases of medium concentration.
WN Natural Rubber (inside FDA, black) NR-L sw NR 80  
LN Natural Rubber (inside FDA, white) NR-L h NR 70  
HH Natural Rubber "heat resistant" NR-H NR-H 90  
IN Butyl-Naturkautschuk-Combination (Isobutylen- Isopren) IIR NR 90   Moderate resistance to seawater, acids and bases of medium concentration.
SN Styrol-Butadien-Kautschuk (Buna EM) SBR NR 80   Good resistance to freon, glycols and brake fluids.
EE Ethylen-Propylen-Dien-Terpolymere (Buna AP) EPDM EPDM 120 * Good resistance to water, glycol, aggressive chemicals and steam.
ÄE Ethylen-Propylen-Dien-Terpolymere (inside FDA, black) (Buna AP) EPDM-L sw EPDM 120 *
PE Ethylen-Propylen-Dien-Terpolymere (inside FDA, white) (Buna AP) EPDM-L h EPDM 110  
BN Acrylnitril-Butadien-Rubber / Nitrilrubber (Perbunan) NBR NR 80 * Good resistance to oils, animal and vegetable fats, hydrocarbons and gas.
GN Acrylnitril-Butadien-Rubber / Nitrilrubber (inside FDA, black)(Perbunan) NBR-L NR 80 *
DN Acrylnitril-Butadien-Rubber / Nitrilrubber (inside FDA, white) (Perbunan) NBR-L h NR 80  
CN Polychloropren-Rubber (Neoprene) CR NR 80   Good resistance to grease, ozone, weathering, freon. Lightfastness and flame resistance.
MN Chlorosulphonyl-Polyethylen-Rubber (Hypalon) CSM NR 80   Chlorine gives the vulcanizate flame retardancy and mineral oil resistance, but also reduces cold flexibility.
FC Fluor-Rubber (Viton) FPM, FKM CR 120   Very good resistance to mineral oils, animal and vegetable fats, chlorinated aromatic and aliphatic solvents and fuels.
KK Silicone-Rubber (Silicone) KK KK 180   Good resistance to salt solutions and water at 100°C, good resistance to weathering, ozone, minerals, animal and vegetable fats, alcohols and glycols. Good temperature resistance.
MQ Silicone-Rubber (inside FDA) (Silicone) MQ MQ 180  
1) In this column, only general information on the elastomer group is possible. Individual consideration necessary. The light-coloured grades generally have poorer mechanical properties than the black elastomers. See General Tables of Resistance. FDA: Part of sleeve in contact with medium acc FDA positive list. black: inside of sleeve made of black rubber / white: inside of sleeve made of "white" rubber E: These sleeves are available with conductive inside (R < 1.000.000 Ohm), additonal fee! KTW: Leitlinie zur hygienischen Beurteilung von organischen Materialien im Kontakt mit Trinkwasser (Umweltbundesamt). The abbreviations are acc. ISO 1629:1976 (E) and ASTM D-1418-79.

Chemical resistance of elastomers

The chemical resistance of elastomers can be estimated using general resistance tables, for example from Bürkle. See also "Chemical resistance of materials - General resistance tables". The material of the inner side of the crimp sleeve is relevant in each case.
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