We (at work) have the odd enquiry for Kalrez o-rings so one day I did the
exercise and got a price from our o-ring supplier for 1 Kalrez o-ring. I can’t
remember the size, but it was somewhere in the 40-50mm diameter ball park. Goes
without saying it had to be sourced OS.
Anyway, I got the call back and ensured I was sitting down. I was expecting
something ridiculously expensive, but I wasn’t expecting something
ball-tearingly ludicrously expensive, which … alas… it was [sigh]
Dunno what goes into making them, but it wouldn’t be a stretch to believe
cold fusion and unicorn semen are crucial to the process.
Troy
From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Doug Jones
Sent: Friday, 24 July 2020 12:55 PM
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: Continuation of small hybrid motor design
Teflon isn't, strictly speaking, an elastomer since it takes a set and cold
flows under continuous pressure.
On Thu, Jul 23, 2020 at 7:53 PM Doug Jones <rocketplumber@xxxxxxxxx
<mailto:rocketplumber@xxxxxxxxx> > wrote:
The only elastomer material that I found to be fully compatible with N2O was
Kalrez. Everything else either burned merrily or got the bends.