19A according to the guardian:
http://www.guardian.co.uk/world/2009...rate-explosiveThe device allegedly used by Umar Farouk Abdulmutallab involved a syringe and a soft plastic container filled, reportedly, with 80g of PETN. The remnants of the bomb are being analysed in an FBI laboratory.
PETN is relatively stable and is detonated either by heat or a shockwave. It is possible that the suspect used a syringe that was converted into an electrical detonator, but more likely the syringe was filled with nitroglycerin.
Abdulmutallab was in a window seat, 19A, and allegedly had the device strapped to his left leg, against the body of the plane. The idea was almost certainly to blow a hole at much higher altitude, so that the decompression would tear the aircraft apart.
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