Cremation is the most common disposition following death. Despite potential religious, cultural, or environmental impacts, laws require CIED removal prior to cremation based on reports of damaging explosions. Quantitative data describing CIED behaviour during cremation has not been previously reported. To predict the safety of cremating bodies without CIED explant using quantitative metrics under thermal stress by assessing 1) risk of projectile injury to persons or crematoria, 2) loudness of device explosion, and 3) toxic chemical release. Medtronic (Minneapolis, MN) CIEDs were tested, including the leadless PPM (Micra VR), transvenous PPM (Azure XT DR), transvenous ICD (Cobalt XT DR), CRT-D (Cobalt XT HF Quad), ILR (Reveal LINQ, LINQ II), and sacral neuromodulator (InterStim Micro). Devices were subjected to UL 1624 19.3 projectile testing and ballistics assessment with high-speed videography, sound level measurement, and both open and sealed chamber overheating. All devices underwent energetic failure at surface temperatures < 500C. The ILR (Reveal LINQ) remained intact; all other devices explosively disintegrated. No device produced enough kinetic energy to cavitate brick or tissue. The greatest kinetic energy was produced by the ICD (Cobalt XT DR; 20J). The loudness of device explosions ranged 84-123 db on open testing with the loudest among the PPM, ICD and CRT-D (each > 120 db), and maximum loudness was 101 db in the sealed chamber testing. Potentially toxic gas byproducts included benzene (max 860 ppm v/v in ICD), toluene (63 ppm in ICD), 1,3-butadiene (86 ppm in PPM), propionaldehyde (165 ppm in ICD), and hydrogen fluoride (0.5 ppm) in the 6L sealed explosion. While CIEDs were breached after thermal failure resulting in device propulsion and disintegration, the projectile forces were small and unlikely to cause crematoria damage or bodily harm. The maximum loudness in a sealed chamber is below what would cause hearing loss. At cremation chamber volumes, no toxic gases were produced in concentrations expected to cause harm. Policies mandating CIED removal may require revision given likely low risks from CIED explosion.