You are using relatively low O2 Nitrox (32% or 36%) and that swivel joint is only exposed to low pressure gas (intermediate pressure only), therefore there is really no concern about high pressure oxygen exposure.
I can't speak about the properties or quality of the INON grease. I wouldn't think there is anything toxic in it, but that would be the only concern (not oxygen). Most silicone grease we use say food grade or something similar.
I can't speak about the properties or quality of the INON grease. I wouldn't think there is anything toxic in it, but that would be the only concern (not oxygen). Most silicone grease we use say food grade or something similar.