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.
Again, Porter stated the cork can never be fully waterproof, but a cork sealant can protect against water damage to the cork surface of the shoe. This breathable sealant can help protect your footwear from wet conditions but making sure you reapply the sealant when needed is crucial, Porter says.