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.
Save. Image by Flickr.com, courtesy of Thomas. Cork is a familiar material, but it is sometimes assumed wrongly to be the product of a great deal of factory processing. Instead, cork literally grows on trees and is a forestry product, and making corks for wine bottles involves only a few simple steps.ork Trees. The raw material for corks is the bark of the cork oak, an evergreen tree present in southwest Europe and northwest Africa. Cork bark contains a high proportion of suberin, a waxy substance that repels water.