Low-priced stock that sells at less than $1.00 per share. Often highly-speculative and volatile, such as start-up mining companies. While, in general, penny stock are considered high-risk securities, some penny stock mature into less-speculative investments. All penny stock are traded over-the-counter.
In its natural form, cork is also a very good fire retardant, although cork dust is actually extremely flammable (because here the cell structure has been broken down). Impermeable: Cork has a magic chemical in its cell membrane that makes it completely impermeable to liquids and gases.
1 oxygen is not flammable but it does support combustion. 2  nitrogen and argon inhibit combustion. 3  when these gases are in the liquid state it is necessary to bear in mind the very low temperatures involved (below -180Â°C).