How to identify good plastic in everyday life

  21/07/2017

Home appliances, plastic it 

In everyday life, the most common resin is PE (polyethylene). Going to some grocery or plastic stores, it is easy to see many transparent rectangular transparent bags or colorful bags which, according to the habit of not knowing when to call the wrong bag. Nylon (nylon is a polyamide of different chemical compositions and properties).


Bottles of milk, soft drinks and other liquid foodstuffs are usually made of high density PE, referred to as HDPE (high density polyethylene) or polyvinyl chloride (PVC) for food use. It can be said in all large markets, small supermarkets or roadside markets ... goods delivered to customers are packed PE bags. However, the production of HDPE also uses toxic chemicals such as hexane and benzene. 

Another resin close to PE is PP (polypropylene). Because PP is more mechanical than PE, it is spinning and weaving into rice, sugar, corn, soybean and peanuts. PP yarn is woven into canvas to cover rain, sunshine is very common in both urban and rural. Buckets , baskets and baskets are also usually made of PP which is considered to be the best plastic. 


Bottle of pure water ... capacity 0.3; 0.5 and 1.0 liters are usually found on reception desks of offices, dining tables of restaurants, family, business or travel, mostly made of polyethylene (polyethyleneterephthalate). This plastic has good mechanical strength should be elected as not cracked, broken when shipping. Larger bottles of 5 liters, 20 liters also made of this plastic. 

Large volumes of PET bottles of various capacities are also used to store vegetable oils (soybeans, sesame, peanuts, etc.). However, these resins can leak into metal ani- Lead and lead oxide are particularly toxic when heated or stored in high temperatures. The scientists also recommend not reusing plastic PET bottles repeatedly because it is difficult to clean and may contain many types of pathogenic bacteria. 

Boxes for storage of food in the shape of a rectangular (storage box) processing in water or originating in China have a colorless body, slightly opaque and the lid is different colors are usually made of PE or HDPE. 

A cylindrical container with a lid or cup to drink bottled water for stacking multiple compacts for transport and arrangement prior to use is also made of PE or HDPE. On the top of the box is a braille print indicating safe in the microwave oven (This is microwave oven safe). 

High speed boilers, fan casing, vacuum cleaner hoods and tubes are mostly made of ABS (acrylonitil butadiene - styrene). This type of plastic is resistant to boiling water without deformation, good mechanical properties, especially high impact strength. Therefore, when vacuuming on the floor of a large area, it is possible to get strong legs to run to another position and if there is a hit on the foot of the table, the chair is also okay. 

All of the plasticizers mentioned above, such as PE, HDPT, PVC, PET, ABS, belong to the thermoplastic family which means that when the temperature rises it softens and flows out of the oil and cools back to its original solid state. Because they are all for general use, they are also called commodity thermoplastics. 

One type of product that is present in our country is made by China, which is a cup of tea with a screw cap and a filter inside to block the tea leaves when pouring or drinking directly. This tank is made of transparent poly (PC) polycarbonate, which has very high mechanical strength and heat resistance better than PET so it can be poured directly into the boiling water without distilling it. Due to its mechanical strength and high heat resistance, PC resins are classified as engineering thermoplastics. Nylon is also plastic. The PC contains a lot of chloride toxins, causing dioxin leakage, a type of toxic substance causing cancer. 

Many types of bowls, plates are beautifully beautiful on a white background and hold on hand feel not plastic but actually these products are made from melamine-formaldehyde resin compound with added fillers and additives, Usually referred to as melamine resin. This is a thermoset plastics, which means that when heated to a certain temperature is solid and have no temperature rise nor melting. 

Get to know good plastic by ... burning 

With the above, you can identify the plastic products used daily from any plastic base. However, to be more certain, it is possible to do a simple experiment of burning. PE, HDPE, PP all belong to a family of chemical composition is nearly the same, if the molecular mass is low, similar to paraffin (wax). Therefore, if the ignition key, no smell is PE, HDPE or PP. PET resin, ABS burns with flame with black smoke and smells bad. PVC resin does not burn into flame. 

Toxic if not used properly 

Considering the toxicity of plastics when used, it can be said that all plastics used in liquid food packaging with well-known brands in the country or abroad are safe because manufacturers Must comply with the legal provisions on the quality of plastic packaging. 

The most worrying issue is the arbitrary use of old packaging. It is not safe to use plastic containers that have been painted with water-based paints for melon and coffee. Some of the toxic chemicals present in the paint have permeated into the plastic and will diffuse into the water-melon and caustic acids. The health of consumers. 

In general, do not use plastic containers that contain chemicals to store food or food. 

It should be noted that when the oil, fish sauce, vegetable oil, liquor should be used, PET bottles (new or refilled) should be used as they are highly safe for food hygiene.

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