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.
According to the EPA, the use of asbestos in textured ceiling paint was banned in 1977. Inhaled in large quantities, asbestos fibers can cause lung disease, scarring of the lungs and lung cancer. However, not all popcorn ceilings contain asbestos. Moreover, if left undisturbed or contained, asbestos is not dangerous.