Gaseous helium is inert, colorless, odorless, noncorrosive, and nonflammable. Helium is the lightest rare gas. Helium is a monatomic chemically inert gas. It will not react with other elements or compounds under ordinary conditions. Since helium is noncorrosive, special materials of construction are not normally required. Vessels and piping must be selected and designed to withstand the pressure and temperatures involved and comply with applicable codes and regulations.

Speed Doors are door systems, mainly used in industrial applications. They are technical enhancements of the generally known sectional doors, PVC fabric doors or roller shutters. The main difference is that the durable construction provides a higher operating speed and they are able to sustain a higher number of cycles (opening and closing cycles) and require lower maintenance and repair cost. The speed can reach 4.0 m and beyond per second. Depending on the intended field of application, horizontal or vertical operating door types are available. They reduce to the maximum air currents and losses of ambient temperatures, and they make the intense flow of people and vehicles easier.


Pectin is a structural heteropolysaccharide contained in the primary cell walls of terrestrial plants. It was first isolated and described in 1825 by Henri Braconnot. It is produced commercially as a white to light brown powder, mainly extracted from citrus fruits, and is used in food as a gelling agent, particularly in jams and jellies. It is also used in dessert fillings, medicines, sweets, as a stabilizer in fruit juices and milk drinks, and as a source of dietary fiber.

NVH stands for noise, vibration, and harshness, and the noise is what the driver and passengers can hear, the vibration is what they can feel and the harshness is how much of an effect thumps, bumps, noise and vibration have on the cabin and its occupants. It is an aggregative indicator with which to measure the quality of automobile manufacturing. As many as one-third vehicle faults are related to the NVH of vehicles.