Web Date: October 31, 2014
For Chemistry Demonstrations, CSB Recommends Stricter Controls
Three fires from educational demonstrations have injured 20 children and two adults since the start of September. Calling such incidents a national problem, the Chemical Safety & Hazard Investigation Board (CSB) on Oct. 30 released a safety bulletin with recommendations for preventing them.
On Sept. 3, a demonstrator at a museum in Reno, Nev., was attempting to create a colored “fire tornado” when she poured methanol from a 4-L container onto a smoldering cotton ball. On Sept. 15, a teacher at a high school in Denver was demonstrating flammable properties when he poured methanol from a 4-L container onto an open flame. And on Oct. 20, a Cub Scout group trying to produce a green flame poured methanol-containing antifreeze from a 355-mL bottle onto a fire in Raymond, Ill.
In each case, the fire propagated back into the bottles and ignited the remaining liquid, CSB investigator Mark Wingard says. Pressure built up in the containers and the fiery fluid was expelled, burning people in the vicinity.
In the Denver incident, the fire “shot out about 12 feet and hit a student in the chest, resulting in serious burn injuries to the student,” the CSB bulletin says. The teacher faces charges of misdemeanor assault. In Nevada, the state worker safety agency fined the museum $2,100.
“These educators see others doing these demonstrations safely and don’t think about the hazards, only the educational benefit the demonstrations have,” Wingard says. The three incidents plus at least one more in New York come less than a year after CSB released an educational video warning of demonstration fires.
CSB Chairman Rafael Moure-Eraso would like educators to reconsider whether it is necessary to do demonstrations involving hazardous materials. “There are safer ways to do these demonstrations and convey the same educational information,” he says.
When demonstrations involving hazardous materials are judged to be necessary, CSB recommends safety controls that include written procedures, training, and personal protective equipment. Educators should also conduct a thorough hazard review of activities, avoid using bulk containers of flammable liquids when performing demos, and provide a safety barrier between the activity and the audience.
Calais Weber was 15 years old when her chemistry teacher poured methanol from a 4-L bottle onto an open flame during a flame test demonstration in 2006. Weber suffered burns over 40% of her body.
“I came very close to dying from my injuries,” Weber said at an Oct. 30 press briefing about CSB’s new safety bulletin. “My greatest fear is that eventually there will be a child [who] won’t be as lucky as I was to have survived.”
On chemical demonstrations, she takes a harder line than CSB. “It is my belief that until there exists a standard mandatory protocol for training all science teachers, there is no reason for methanol to be used in classrooms. My education and love for chemistry was not fostered by seeing a demonstration in person, and it would not have been hindered by simply watching a video of it being performed in a controlled setting by trained chemists,” she said.
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