Almost certainly, we often come into contact with items made from plastic. Materials are very popular because they are lightweight, inexpensive and not easily broken (compare with the paper).
However walu looks the same, a plastic made from different materials for different purposes. And manufacturers that will either put the symbol on the packaging / plastic products. As presented by Akuinginhijau:

# 1. PETE or PET (polyethylene terephthalate) plastic bottles used for clear / transparent / translucent like mineral water bottles, juice bottles, and almost any other beverage bottles. Boto-bottle with materials # 1 and # 2 is recommended only for single use. Do not use for warm water let alone hot. Discard the bottle is old or looks scratchy.

# 2. HDPE (high density polyethylene) bottles used for milk milky white. Same as # 1 PET, # 2 is recommended only for single use.

# 3. V or PVC (polyvinyl chloride) plastic is the most difficult to recycle. This plastic can be found on the plastic wrap (cling wrap), and bottles. The content of the PVC that contained DEHA in plastic wrap can leak and into the greasy food when heated. PVC potentially harmful to the kidneys, liver and body weight.

# 4. LDPE (low density polyethylene) was used to place food and bottles of soft.Goods with the code # 4 can be recycled, and good for items that require flexibility but strong. Goods with a # 4 arguably can not be destroyed but still good for the food

# 5. PP (polypropylene) is the best choice for plastic materials especially for dealing with food and drinks like a place to store food, drink bottles and most drink bottles for babies. Common characteristic is transparent bottles that are not clear or cloudy.Find this symbol when buying goods made from plastic

# 6. PS (polystyrene) is usually used as a place to eat styrofoam, disposable drinking places, etc.. Polystyrene Materials styrine material could leak into the food when the food is touching. Styrine materials harmful to the brain and nervous system. Besides the food, styrine also be obtained from cigarette smoke, fumes and building construction materials. This material should be avoided and many U.S. states have banned the use made of styrofoam food places including China.

# 7. Other (usually polycarbonate) can be found in the foods and beverages such as sports drink bottles.

Polycarbonate can release its main ingredient is bisphenol-A into food and beverages that may damage the hormone system. Create Avoid polycarbonate plastic material goods that do not include this code, security question its use for our health and the family could have been symbols were misused by an evil manufacturer, but it’s just a case, a better use of the list symbol. If the symbol is given wrong, there is evidence to menintit, compared with a product that does not include symbols.