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Distinguish some common 3D printing materials by the actual product

              

Today plastic bags are in "golden age", everywhere also. But few know that some of them are made from toxic plastic materials with human health. Generally, PP, PE and PS resins are non-toxic plastic used to produce fixed food containers such as trays, boxes, plates. PVC resin is toxic and should not be used to produce food bags or containers. To identify whether the plastic is toxic or not, use a scissors cut a piece of food bag into the fire and observe:

Non-toxic plastic is very flammable, after pulling out of the fire still continues to burn and liquid liquid, not fuming. In contrast, the plastic is toxic, it is difficult to burn, when out of the fire will be off. When fires are burning and have a strange odor smell.
In addition: the weight of toxic plastic is usually greater, drop into the water easily sink, the non-toxic is mild and easy in the water. Considering the toxicity of plastics when used, it can be said that all plastics used for liquid food packaging are safe as manufacturers must comply with the bag quality regulations. plastic bag. Know the good plastic by burning, with the knowledge 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. Polyethylene, HDPE, PP are all of a family of chemical compositions almost the same, if the molecular weight is low, similar to paraffin (wax). Therefore, if the lighters are burned, there is no smell, it is PE, HDPE or PP. PET resin, ABS fire with flame black smoke and smell.
Toxic if not properly used, consider the toxicity of plastics when used. It can be said that all plastics used for liquid food packaging with well-known brands in the country or abroad. are safe because manufacturers must comply with legal requirements for the quality of plastic packaging. The most worrisome issue is the arbitrary use of old packaging. It is not safe to use plastic containers that have been painted with water to make melon and tomatoes. Some of the toxic chemicals in the paint that has infiltrated the resin will diffuse into the water - the acid of the melon, coffee and have a detrimental effect on the health of the consumer.
In general, do not use plastic containers that contain chemicals for drinking water or liquid foods. It should be noted that when oil, fish sauce, vegetable oil or alcohol is needed, PET (polyethyleneterephthalate) bottles (new or refilled) should be used as they are highly hygienic. . Home appliances, plastic, in the daily routine the most common plastic is PE (polyethylene). Going to some grocery or plastic stores, it is easy to see many transparent rectangular transparent bags or bags of different colors which according to habits do not know from when the wrong call is bag Nylon (a polyamide of chemical composition and other completely different properties).
Bottles of milk, soft drinks and other liquid foodstuffs are usually made of high density polyethylene, 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 plastic close to PE is PP (polypropylene). Because PP is more mechanical than PE, it is spinning and weaving into rice, sugar, corn, soybean, peanut. PP woven into the canvas to cover rain, sunshine is very popular in both urban and rural. Buckets, baskets and baskets are also usually made of PP which is considered to be the best plastic.
Bottles of pure water with a capacity of 0.3; 0.5 and 1.0 liters are usually found on the reception desk of the restaurant, the dining table of the restaurant, the family, take on a business trip or travel, mainly 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 PET plastic bottles as it is difficult to clean and may contain many types of pathogenic bacteria.
A cylindrical container with a lid or cup to drink bottled water for stacking several containers for transport and arrangement prior to use is also made of PE or HDPE. On the top of the box is a braille print that says "This is a 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, has good mechanical properties, especially high impact resistance.
Therefore, when vacuuming on the floor of a large area, it is possible to kick legs to run to another location and if there is a hit the table foot, the seat 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 they soften and then flow and when cooled back to their original solid state. Since they are all for general use, they are 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 high mechanical strength and heat resistance better than PET so it can be poured directly into the boiling water without making the deformation pot. Due to its high mechanical strength and heat resistance, PC resins are classified as engineering thermoplastics. Nylon is also plastic. PC contains a lot of chloride toxicity, causing dioxin leak, type of toxic substance causing cancer. Many types of bowls, plates are very beautiful on a white background and hand held in the hand feel not plastic but actually these products are made of melamine-formaldehyde resin compound additives and additives, often referred to as melamine resin. This is a thermoset plastics, meaning that when heated to a certain temperature is solid and have no temperature rise nor melting. Many types of bowls, plates are very beautiful on a white background and hand held in the hand feel not plastic but actually these products are made of melamine-formaldehyde resin compound additives and additives, often referred to as melamine resin. This is a thermoset plastics, meaning that when heated to a certain temperature is solid and have no temperature rise nor melting. Many types of bowls, plates are very beautiful on a white background and hand held in the hand feel not plastic but actually these products are made of melamine-formaldehyde resin compound additives and additives, often referred to as melamine resin. This is a thermoset plastics, meaning that when heated to a certain temperature is solid and have no temperature rise nor melting.

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