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.
No specific element makes anything flammable, as many elements can result in fire or an explosion; many can be safe when used one way and dangerous in another. The only elemen â¦ t necessary for a flammable object to ignite is oxygen. 1 person found this useful.