Methylene chloride must be refrigerated until ready to use, not an explosive; used un calibration of devices used to detect explosives; which have nitrogen present
NSN 6620-01-048-4145
NSN 6650-00-484-3616
NSN 6220-01-032-5646
NSN 4140-01-289-7912
NSN 6645-00-505-6026
NSN 5985-01-005-7601
NSN 6620-00-147-3139
NSN 6135-00-983-9187
NSN 6610-01-117-7130
NSN 5975-00-055-7277
NSN 6135-01-592-4139
NSN 6220-01-322-2146