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Reactions with Black Phosphate Oxide coating

2000

I am using new hose couplings in the hydraulic, coolant, fuel and transmission systems of the machines we produce here. The new couplings are coated with a black phosphate oxide. Will this coating react in any way with the fluids contained in the various systems?

Pete Goldsmith
- Woodstock, Ontario, Canada

2000

Not to my knowledge, although if the coating was "oiled" the oil would presumably leach into organic fluids.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey

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