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.
The amazing natural properties of cork. Cork is a pretty extraordinary material and that is why it has so many uses. The key to corkâs many properties is its honeycomb cell structure. Each cell is a 14-sided polyhedron filled with air with an extremely strong and flexible membrane that is waterproof and airtight.