Two parts by weight of water per part of aerozine-50 (A-50) will "inert" a spill of A-50 against ignition in air. In the case of a burning A-50 pool, the fuel evaporation rate is about 0.6 Lb/min-ft2 during most of the duration of burning, and a well-distributed spray of 1.2 lb water/min-ft2 of liquid surface is sufficient for extinguishment. To inert an A-50 spill against hypergolic ignition with N2O4, as much as 10 lb of water are required per lb of fuel, depending on the circumstances of mixing. In situations where use of large amounts of water may not be practical, CF3Br (Halon 1301) can abate fire hazards; 70 percent of CF3Br in the atmosphere will inert a small spill at room temperature against ignition by spark or pilot flame. The same concentration would extinguish most secondary fires ignited by the hypergolic reaction of A-50 and N2O4, but impracticably high concentrations of CF3Br would be required to extinguish an established A-50 pool fire or to inert the maximum vapor concentrations of A-50 possible in a closed chamber.
Links with this icon indicate that you are leaving the CDC website.
The Centers for Disease Control and Prevention (CDC) cannot attest to the accuracy of a non-federal website.
Linking to a non-federal website does not constitute an endorsement by CDC or any of its employees of the sponsors or the information and products presented on the website.
You will be subject to the destination website's privacy policy when you follow the link.
CDC is not responsible for Section 508 compliance (accessibility) on other federal or private website.
For more information on CDC's web notification policies, see Website Disclaimers.
CDC.gov Privacy Settings
We take your privacy seriously. You can review and change the way we collect information below.
These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site. All information these cookies collect is aggregated and therefore anonymous. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance.
Cookies used to make website functionality more relevant to you. These cookies perform functions like remembering presentation options or choices and, in some cases, delivery of web content that based on self-identified area of interests.
Cookies used to track the effectiveness of CDC public health campaigns through clickthrough data.
Cookies used to enable you to share pages and content that you find interesting on CDC.gov through third party social networking and other websites. These cookies may also be used for advertising purposes by these third parties.
Thank you for taking the time to confirm your preferences. If you need to go back and make any changes, you can always do so by going to our Privacy Policy page.