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O-rings, hygienic gaskets, mechanical seals and shaft seals, specified by compound rather than by polymer family.
Send the serial number of the unit, and a photograph of its nameplate with it. The serial number is what the part is ordered against; the nameplate settles which version of the machine it belongs to, because the same number can appear on more than one.
Part numbers are welcome where you have them. The quotation states the genuine part, its origin and its lead time.
A seal identified only by its polymer family is not fully specified. Correctly compounded dairy grades are produced by both original equipment and aftermarket manufacturers, and are documented as suitable for milk contact and superior to silicone and HNBR under CIP.
| Duty | Specification |
|---|---|
| Milk and dairy product under caustic and nitric CIP | Peroxide-cured EPDM, compound designation stated |
| Fats, oils, hydrocarbons | FPM |
| Steam with mechanical abrasion | HNBR |
| The question to put to a supplier | “What is the compound designation, and is it peroxide-cured?” |
Source: elastomer manufacturer material data.
A seal is compressed hot, held, and released. Recovery determines whether it continues to seal. A compression set of approximately 19% after 70 hours at 100 °C is the published figure for a correctly cured compound.