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Welcome Ian
I am aware of Ian's work, he's a top man when it comes to PPE.
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SCBA facemasks
No I am not a BA instructor, I was responsible for PPE in Grampian for 25 years, I also sit on three British Standards committees, Protection from heat and flame, Firefighters protective ensembles and Protective gloves. Anyone who knows me, knows that my careers was focused on firefighter protection and nothing else. My involvement in this is whenever a firefighter got burned, the finger was normally pointed at what they were wearing, i.e. PPE failure. Its bad enough when one firefighter gets burned, but when it happens over and over again, I think we have a problem. I spoke to a reliable source a few weeks ago and they told me that firefighters across the UK are being burned weekly at various locations, That my friends is not acceptable. During my 31 years with Grampian I have inspected many crazed visors, I have seen melted pressure gauges (and I have pictures as well) I did some investigation for another Fire and Rescue service where they were melting helmet visors, and in fact carried out an investigation where an hot fire instructor from and English fire and rescue service burned through his tunic and indeed scorched his sweatshirt. From head to foot the firefighter is encapsulate in protective clothing, all I need to say tested differently and at different temperatures, and all with their own limitations. I am not sure how to overcome this problem, I have my own thoughts, but they are radical and I am sure would never be accepted.
15 years ago, I wrote to a scientist who has done many studies and reports on firefighter clothing in the USA, he works with NIST (National Institute of Standards and Technology) He told me that he had been invited at participate in an exercise in Houston Texas. He put heat sensors on the outside of his tunic and on the inside as well. The temperature inside the container varied from 200-400C, his heat sensor on the outside of his tunic at one point was 100C but the sensors inside his tunic started to rise to 60C and he told me that had he not been able to snake (the ability to move inside your PPE so there is not a permanent contact point) he would have burned.
EN469
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Ten years is normal, that's what we did. Obviously that's not to say the at the ten year mark the sets are done, but they start to cost lot of money to service and maintain and of course a lot of the original components require to be replaced. And of course technology has moved on after that period of time. We used Sabre/Scott sets and they recommended replacement after ten years. By the time you carry out your evaluations that time may be extended by an addition six months or so.
EN469