Do FSC Cigarettes Still Cause Fires? - DeHaan on Fire скачать в хорошем качестве

Do FSC Cigarettes Still Cause Fires? - DeHaan on Fire

Dr. John DeHaan, world renowned forensic scientist and author, answers the question, " Do FSC cigarettes (also known as LFP. RFR or RIP cigarettes) still cause fires? In today's discussion with Dr. Dehaan, we're looking at a very provocative and controversial question: "Do cigarettes still cause fires?" Viewer and listener discretion is advised. The beginning of the transcript of this video. To read it in its entirety, go to https://www.firewiselearningacademy.c...  - Welcome back to your channel Dr.Dehaan, it's great to be back with you and today we're gonna tackle the first topic on this channel and this is a really interesting one that I was not aware of and it's a really provocative question that is out there right now and you've got a lot of good evidence and some facts to give us. Do cigarettes still cause fires? What's the whole premise or what's the whole origin of this question being asked now? Well proper fire investigation, whether it's a structural fire or accidental fire on a dressed person, or a wildland fire, one of the challenges is the investigator has to create a list of potential ignition sources that need to be examined and excluded and with the intent hopefully of getting down to the point where you know there's one potential cause for this fire that I can't eliminate and it does have the capacity to start a fire in this material. And so that's really a critical feature of modern, what they now call Scientific Fire Investigation, is to create that list and test all of those possible sources of ignition. And that's where we run into problems because everyone for decades has included cigarettes, tobacco cigarettes as a potential igniter of fires, whether it's wildland fires or structural fires, bedding fires, clothing or whatever, because they were in such common use and they do represent a heat source and people you know know that if they come in contact with the right kind of fuel, yeah they can ignite. Well so you know cigarettes was always considered one of your possible sources of ignition and you needed this investigator to examine that possibility. And things have changed in the last few years. The American government and most of the EU countries have passed legislation mandating that what in America is sometimes referred to as Fire Safe Cigarettes and even that is a misnomer. Fire safe cigarettes would indicate to the consumer, oh this means these cigarettes can't start fires. Well the FSC printed on the package of cigarettes doesn't stand for Fire Safe Cigarettes, that's how the vernacular is used. FSC actually stands for Federal Standard Client, so really all that FSC means is that these cigarettes have been tested according to a reproducible laboratory grade ignition test and have met the standard for failure to ignite the substrate in which they're in contact or as they're intended to if they actually self extinguish before they burn to completion. Now that's an interesting test because the issue is well, if the cigarette can start a fire before it burns it's full length, why do we care whether it burns to full length or not? But this was a engineering solution or an engineering solution was offered by the cigarette manufacturers. Hey how about if we change the porosity of the paper of the cigarette and then we put ventilation holes in so that if the cigarette burns part way down, it kinda loses momentum and is in very small fire a glowing cigarette sorry, a smouldering cigarette is a five watt fire. Which is a very small quantity, a paper match by comparison is a 50 watt fire. And so a five watt fire, well, you got the right fuel and the right exposure, yeah, it can start a suitable susceptible fuel on to the road to ignition. So that was part of it and so the test is actually, it was created by extensive laboratory testing through Nistum and things like that to get a federal standard sorry, a standardized test and it looks good from a scientific standpoint because your test target is a stack of filter papers, laboratory filter papers. Well, that sounds good, paper is ignitable but then you realize that those filter papers are pure cellulose. Cellulose it's self is what? 90 or 80% of paper and cardboard and things like that it consist of of, but it isn't terribly ignitable. Pure cellulose doesn't really ignite very well or burn very well. So you think, well, okay but this is reproducible so we'll give it that. So the cigarette is lit, placed on top of a stack of these, and then there's a shroud like a bell jar or something like that placed around it to keep random air currents from affecting it because a smouldering fire especially a small one like this five watt cigarette is very susceptible to the . . . . . To read the rest of this transcript, go to https://www.firewiselearningacademy.c... #firewise #fireinvestigation #dehaanonfire