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        People are serious about finding the culprits that increase the risk cancer. Plastics have been suggested as one of the everyday carcinogens. There are some plastic chemicals it is wise to reduce exposure to in order to minimize health risk. Checking which type of plastic you use takes a few moments, and could have considerable impacts on your health.
At the bottom of the bottle, you will find a triangle with a number from one to seven. With the symbol you see, you can learn which type of plastic you have and how safe or unsafe it might be.
Number 1: Known as PET or PETE, the bottle with this number means it should only be used once because reusing them can expose people to a chemical substance called EPA. The plastic could possibly emit antimony, a heavy metal that can interfere with the hormones in the body. It is possible the plastic is carcinogenic. Found in many common household items includingbeverage bottles, peanut butter jars, mouthwash bottles. It becomes fiberfill for sleeping bags, carpet fibers, and tote bags. recyclable - widely acceptable.
Number 2: A triangle with the number “2” in the bottle is HDPE or HDP, which is considered the good plastic. It doesn’t have as much emission as the chemicals in other bottles when in contact with water. Found in milk jugs, butter tubs, detergent bottles, Shampoo bottles, food containers. recyclable- widely accepted. Becomes trash cans, flower pots and traffic cones.
Number 3: Labeled as V or PVC, the number 3 in the bottle means that it has two toxic chemicals that can influence hormones in the body. PVC is the most used type of plastic around and contains phthalates, including DEHP. Found inplumbing tubing, fences, and siding. Recyclability is limited. Becomes irrigation and drainage pipes. 
Number 4: LDPE plastics have the number 4, which means they don’t emit chemicals. Found in water bottles, squeeze bottles, grocery bags, shrink wrap, bread bags.Recyclability - not commonly recycled, but accepted at certain stores and drop off locations. Becomes new grocery bags
Number 5: PP or number 5 plastics are good types of plastics. They are recognizable because of their white color. Sometimes, they are transparent. PP plastics are common in cups of yogurt and syrup bottles, tupperware, prescription bottles, bottle caps,straws, and plastic diapers. Recyclability - Often not accepted by recycling centers. Look for take back programs such as Gimme 5. Becomes toothbrushes and razors
Number 6: Polystyrene, commonly known as styrofoam emits STIREN, which is carcinogenic. It is found in fast food packaging, coffee cups, egg crates, carry out containers, meat trays, packaging peanuts.recyclability - only very few centers. Becomes insulation, license platte frames and rulers.
Number 7: Mixed plastic types with no labels are in this category. They are known as PC. Don’t trust plastics without labels because they often emit BPA, a very harmful chemical. PC plastics are common in containers for food, sports drink bottles, and worse, infant bottles. A catchall for resins that don't fot 1-6 criteria, including biopplastics made from corn, sugar, and potato derivatives. Found in baby bottles, 3 and 5 gallon water bottles, sunglasses, compact discs. Recyclability - Difficult. Usually not recycled. Look for take back oprograms.
Plastics Implicated As Carcinogens
Some compounds found in many plastics that are thought to contribute towards risk of cancer. Evidence tends to be limited, as studying the effects of these in humans has some obvious ethical barriers.
The three most supported compounds are:
•            Phthalates
•            Bisphenol A (BPA)
•            Dioxins
Dioxins: Dioxins are released during the incineration of plastic waste, particularly PVCs. They are not present in containers designed for food storage. Exposure to dioxins is the primarily through food. Animals in polluted areas store the dioxin in their fat reserves, and the chemical accumulates through the food chain. Limiting consumption of fish or meat with a high fat content reduces exposure.
Phthalates and BPA are more likely to be present due to the plastics that you are using. Di(2-ethylhexyl) phthalate (DEHP) is listed in the US Report on Carcinogens as “reasonably anticipated to be a human carcinogen based on sufficient evidence of carcinogenicity from studies in experimental animals”. This stuff is everywhere and regarded as a ubiquitous environmental pollutant. From the 2011 Report on Carcinogens:
“About 95% of DEHP produced is used as a plasticizer in polyvinyl chloride (PVC) resins for fabricating flexible vinyl products (ATSDR 2002). Products typically contain from 1% to 40% DEHP; however, Tickner et al. (2001) reported that DEHP levels in PVC medical tubing may be as high as 80%. Plasticized PVC has been used in many consumer items and building products, such as tablecloths, shower curtains, furniture and automobile upholstery, imitation leather, garden hoses, floor tiles, swimming-pool liners, sheathing for wire and cable, rainwear, shoes, toys, dolls, baby pants, food packaging materials, tubing used in commercial milking equipment, and weather stripping.
BPA is a weak synthetic estrogen, which can act as a hormone disruptor. As various cancers are related to hormonal controls, including some forms of breast cancer, many people feel that it is wise to limit exposure to BPA.
Ensure the correct use of plastic items. Heating food in a plastic container containing BPA or phthalates is likely to result in food becoming contaminated with these chemicals. Allowing plastics to come into contact with detergents can result in these chemicals being released.
Which Plastics To Avoid?
Avoid or exercise caution when using PETE, PVC, or Polystyrene plastics. The standard labels found on plastic products easily identify them: a triangle containing a number. These three types of plastic are numbers 1, 3, and 6.
Common uses of these include:
• #1 – PETE (polyethyleneterephthalate): flexible drink or oil containers
• #3 – PVC (polyvinyl chloride): plastic trays for sweets or fruit, innumerable other consumer uses.
• #6 – PS (polystyrene): Toys, hard packing, CD cases, vending machine cups
• #7 – Miscellaneous. Exercise caution when using products that fall into category 7. This is a kind of ‘misc.’ box for plastics that don’t fall into other classifications. It is difficult to make generalizations about the potential impacts of these as the chemical structure varies more widely. Categories 3 and 7 are most likely to contain BPA.