Silicone O-Ring
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Hardware / Hardware Accessories

Silicone O-Ring

$3.00
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Stearman Press LLC

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Silicone O-ring: Fits both the SP-445 and the SP-645 Max. These are a deep blue color to distinguish from the black NBR O-rings. Sealed in a Mylar, oxygen resistant package. Silicone is more resistant to Oxygen, Ozone, chemicals etc; thus has a longer shelf life. These are Durometer A-60, vs the typical A-70. (Just slightly softer.) This makes a better seal but isn't as resistant to wear. Not an issue since the film tanks operate at a very low pressure differential. A bit more expensive. Industry standard "-242" size. Having an extra O-ring on hand is a good idea; having more than 2-3 is probably a waste of money.  Most industrial supply houses carry -242 O-rings in various materials, so you don't have to worry about them becoming extinct.

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