Meaning of recycling symbols on plastic bottles and containers

Have you ever wondered what the numbers, or recycling symbols mean at the bottom of plastic bottles and containers? 
Do you know that, while the use of all plastics should be limited if at all possible, some are safer than others?

(Source:-Google)

Every plastic container or bottle has a recycling symbol. The symbol is a number, ranging from 1 to 7, within a triangle.These symbols offer a great deal of information regarding the toxic chemicals used in the plastic, how likely the plastic is to leach, how un-bio-degradable  the plastic is, and ultimately the safety of the plastic.

Recycling symbols and their meanings and uses:

1.Plastic-1

   This type of plastic is usually clear and used to make soda and water bottles. Some consider it safe, but this plastic is known to allow bacteria and flavor to accumulate. It is  recycled into furniture, carpet, fiber etc.

2.Plastic-2

   This plastic is one of the 3 plastics considered to be safe, and has a lower risk of leaching.It  is recycled into pens, recycling containers, picnic tables benches, fencing,detergent bottles etc.

3.Plastic-3

    These may contain phthalates, which are linked to numerous health issues ranging from developmental problems to miscarriages. They also contain DEHA, which can be carcinogenic with long-term exposure. DEHA has also been linked to loss of bone mass and liver problems.These should not be used for cooking purposes and should not be burned.

4.Plastic-7

   It  includes polycarbonate, which contains the toxic bisphenol-A (BPA). These plastics should be avoided due to possibly containing hormone disruptors like BPA, which has been linked to infertility, hyperactivity, reproductive problems, and other health issues.

• Avoid recycling symbols 3, 6, and 7. While Number 1 is considered safe, it is also best to avoid this plastic.
• Look for symbols 2, 4, and 5, as these plastics are considered to be safest. These are the plastics to look for in terms of human and animal consumption.

(source:http://www.nationofchange.org)