It was that time of year again for me to have my fire extinguishers recertified. When the guy was here checking on them I told him about the fire that I had in the lasers recently and how I reached for the extinguisher but didn't use it. He told me that the chemicals in the ABC extinguisher are very very corrosive to aluminum and could cause more damage to the lasers than the fire would. He told me that CO2 would be the way to go.

I just figured I would post this so everyone here would know the risk of using a ABC extinguisher in there lasers (ABC extinguishers are the most common because they are cheap and work on electrical fires, grease fires and wood fires)