F1 = the extendible force measured at 5 mm inward piston rod.
The piston rod is made of stainless steel AISI 316 or AISI 431 hard chromium plated.
The cylinder is made of stainless steel AISI 316 and grinded.
The botompiece and the guiding are made of seaworthy bronze.
These gassprings are provided with a valve so that afterwards the extendible force can be changed, only increased, not decreased!