Only nitrogen is used as the pressure medium inSWAN gas springs. About 75% of the air we breathe consists of this gas. Nitrogen is absolutely safe and harmless tohealth. In addition, nitrogen does not burn. On the contrary, nitrogen is used in the chemical industry to prevent and extinguish fires. In addition, every SWAN gas springs contains flame-retardant oil to lubricate the seals and to achieve certain functions, such as damping or rigid locking.