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.
|
| 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 |
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.