The time limit for. shipping a POV is the same as for travel and HHG transportation limits (JTR Para 5366, POV. Transportation Time Limitation), 1 year from the date of retirement/separation with severance. pay or 180 days from the date of separation.
The envelope is the large bag that holds the helium gas. The envelope is generally cigar-shaped, for aerodynamic purposes, and made of a durable, airtight, lightweight fabric (polyester composites) that is much like the fabric of a space suit.
Helium is the most popular party element because it is used for making balloons stay afloat and for giving people funny high-pitched voices when it is inhaled. But those arenât the only things that helium can do. Helium has the atomic number 2 and an atomic weight of 4.002602. At room temperature, it is a gas and it is a non-metal.