Hello Charlie, I apologize for not answering your question directly, but I would like to respond based on the general intent. Kapton tape is flame resistant, but I recommend that you take samples and apply a flame to see how it reacts. My personal opinion is that Kapton tape won't contribute fuel to a fire, but it isn't likely to contain it either. Thin film material might not be suitable if the intent is to slow the progression of a fire to keep it from reaching other flammable material.
Consider fabricating the proposed tape enclosure on a few sample batteries and intentionally fault them to induce an exothermic reaction. The results may give an indication whether you want to pursue this path further. Best regards, Ted Eckert The opinions expressed are my own and do not necessarily reflect those of my employer or TC 108. From: Charlie Blackham <[email protected]> Sent: Friday, October 8, 2021 6:25 AM To: [email protected] Subject: [EXTERNAL] [PSES] UL 510 Flame retardant tape All Various Kapton tapes are sold as Flame Retardant, some seem to reference UL 94 and others UL 510. The scenario is a product falling under EN 62368-1 and the secondary lithium battery needs a fire enclosure and rather than using the product enclosure, one could be made for the battery using a suitable plastic or manual application of retardant tape. Is there any correlation between UL 510 and UL94 when considering creating a Fire Enclosure for a battery as per Clause M.4.3 ? 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