Safety lighter cord
A fabric tube with a diameter of about 3 to 5 mm filled with black powder is called a safety fuse. The burning safety lighter cord cannot be extinguished by water; there are versions that even continue to burn under water.
Safety fuses should be made in such a way that they can only be ignited by an open flame and not by sparks. The target burning speed in the EU is 60 to 100 cm per minute.
The burning rate of a test piece must be checked before use, as black powder can be hygroscopic and failure after a long period of storage cannot be ruled out. Since the ignition takes place in the danger area and there is a long period of time between the ignition and the explosive explosion , the use of the safety fuse is more risky compared to other types of ignition (e.g. electric detonators ) .
National regulations
- In Switzerland , safety fuses must burn for at least 90 seconds.
- In Austria , the use should be restricted if possible due to the danger (see explanations on the Explosives Ordinance ). The burning time must be at least two minutes.
See also
Web links
- Blasting work (accessed April 24, 2020)
- Blasting service badge in bronze (accessed April 24, 2020)
- Ordinance on Explosive Substances (accessed April 24, 2020)
- Guide to artificial avalanche release (accessed April 24, 2020)
