Regarded by many engineers as a “super polymer,” PEEK is a colorless, organic, semicrystalline thermoplastic in the polyaryletherketone (PAEK) family. It has a high modulus and hardness, which makes it more rigid and difficult to machine than softer polymers, like PTFE. PEEK is highly resistant to thermal degradation and attack by both organic and aqueous media. It resists creep and retains dimensional stability at high temperatures and pressures, making it ideal for use in seal backup/anti-extrusion devices, and high-temperature scraping applications in viscous media.
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I had been thinking about trying some sort of gasket at the nozzle/throat tube connection for some time. I recently picked up a set of Olsson Ruby nozzles so I could start running filled materials. I was skeptical that the torque spec on the nozzles would be adequate to create a seal on the throat tube. I'm using the Olsson torque wrench printed in Hatchbox PLA to tighten.My first run with the ruby and CF PETG ended up oozing - made a fine mess of the silicone sock. So I dropped one of these between the nozzle and the throat tube. https://www.mcmaster.com/93785a110 High-Temperature PEEK Plastic Washerfor Number 0 Screw Size, 0.078" ID, 0.188" OD.So far so good. I ran several more parts in the PETG with no ooze. Now running Hatchbox ABS at 260C and still no issue. The real test will be with CF PC which I expect to run at 300C based on my non-filled PC experience. PEEK glass transition should be at 289C - melting point at 343, so I'll have to see what happens at 300.
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