Gas Springs are a system where a rod is mounted into a tube with seals and guiding pistons the cylinder is filled with compressed nitrogen gas, which applies equal pressure on both sides of the piston. The surface of the piston rod side of the piston is smaller than on the opposing side, producing a pushing force.
The Gas Springs are filled with Nitrogen gas, the nitrogen used to fill gas springs is not flammable or hazardous. The gas can go weak or stronger depending on enviorement. Normal working and testing temperature is 22 °C, the gas springs can work between -30°C to +80 °C and force difference against temperature is shown on the following graphic.
You can calculate the F1 force as shown at following graphic.