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.
A number of these fires have involved flammable medications in the form of prepping agents (alcohol and alcohol-containing iodophors), eye lubricants, ointments, and wound dressings (tincture of benzoin and collodion). These are just some examples of how flammable some products can be. According to the material safety data sheet for ethyl chloride, it is heavier than air, and the vapors may hug the ground, making distant ignition and flashback possible. Even static electricity may ignite it.