pcb free and chemicals - word describes
chemicals - word describes A chemical substance is a form of matter that has constant chemical composition and characteristic properties. It cannot be separated into components by physical separation methods, i.e., without breaking chemical bonds. Chemical substances can be chemical elements, chemical compounds, ions or alloys
1.The good, the bad and the complex. Lately chemicals have been receiving a lot of flack for being toxic, but we must remember that we rely on chemicals for much of our life. Chemicals are a necessary and helpful part of life, but the properties that make them good for our industries, such as their stability and persistence, are often the same things that make them bad for the environment. Understanding how they interact in the environment is complex and can be influenced by features such as quantity, level of exposure and the specific setting.
2. PCB spells trouble. Polychlorinated biphenyls are manmade chemicals used for their stability, nonflammability, and high boiling point. PCBs were originally intended for industrial applications so it was assumed that they couldn't easily be released into the environment. Then we discovered that PCBs are harmful to the environment and to humans, with health impacts including cancer and effects on the immune system. As persistent chemicals, PCBs do not easily break down once released into the environment, and they are able to travel far distances and accumulate in living things. PCBs were banned in1979, but they are still frequently found in the environment and in products produced before the ban.
3. The lesser of two evils? Sometimes referred to the "new PCBs, http://www.slideshare.net/pcbonline " polybrominated diphenyl ethers are used as flame retardants in many consumer products, including cars and furniture. Concerns over these chemicals include adverse neurobehavioral impacts on humans and thats true now read first day if you start looking at videos its not goodecotoxicity in many animals. Production of PBDEs started in the 1970s, peaked in the late 1990s, and began to be phased out beginning in 2009.
4. Think twice before washing your hands. If you've never been one to read product labels, now might be the time to start. The chemical triclosan can be found in many personal care products, including antibacterial hand soap and toothpaste, as an antibacterial agent. Production of triclosan started in the 1960s and increased rapidly, despite some studies saying that it does not provide any added antibacterial benefits. Furthermore, a University of Minnesota study showed triclosan is able to build up in the sediment of lakes, and it also forms dioxins when exposed to sunlight. The good news? Minnesota recently became the first state in the country to ban the chemical, effective January 1, 2017.
5. One of these things is not like the other. Research over the past few decades has made strides in understanding how chemicals act in the environment. Unlike PCBs and PBDEs, which travel easily, perfluorochemicals have a negative charge that binds them to things and keeps them relatively stationary. Yet, despite believing that PFCs shouldn't go anywhere, researchers kept finding them all over the globe. Eventually, they discovered that the precursor chemicals were being distributed globally in the environment, which then transformed to form the PFCs.
LIST OF CHEMICAL INDUSTRY IN WORLD
Air products and chemicals
Dow chemical company
Some of the chemical suppliers /chemical companies are
2a pharmachem usa
3n international, inc
A E fleming
Agvar chemicals Inc
Abbey color inc
KEYWORDS:chemical industry,chemical suppliers,chemical companies