This might be of interest to some

[Toosh]

http://www.allchemi.com/eng/refregerants/safety.html

Toosh

[Grizzly]

Thanks Toosh.
Grizzly

[SULTAN]

thank you soo much for the info.
We as engineers and techs should always be cautious working with refrigerant. Imagine a system have a blockage inside and you think all refrigerant is out and its not and you start brazing at the perfect spot to create an explosion..... *sigh*