Under what circumstances can a flammable mixture of HFC134a could get formed in a workshop?
The condition at which HFC 134a could become flammable is as follows: 60% HFC in the air at 0.4 bar gauge pressure and at a temperature of 177° C. The chance for all these parameters to match at a time is unlikely. This can probably happen if there is a fire due to other reasons in a workshop (temperatures can reach or exceed 177°C) and 134a gas has leaked extensively in the workshop. At ambient temperatures, all concentrations of 134a in air are non-flammable at pressures below 15psig i.e. 2 Barg, according to DuPont’s literature on 134a.
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