
The 15-Second Delay Detonator Ml does not use the standard nipple, nor is it used with a blasting cap. It is used to obtain delay in firing demolition charges, particularly during assault demolitions. It can be used to fire charges under water, since the case is waterproof.
This detonator consists of an olive drab plastic case, a pull ring attached to a coated pull wire, flash compound, and a powder-train delay tube with a detonator at the end.
When the safety pin is removed, a jerk on the pull ring draws the coated wire through the Hash Compound. The resultant flash ignites the powder-train delay, which sets off the detonator 15 seconds later.
No information about hazardous components.
Nothing else to see.
OP 1664, Volume 2 - US Explosive Ordnance (1947)