For example, drinking tea or drinks in plastic cups: Us […]
For example, drinking tea or drinks in plastic cups:
Use disposable plastic bowls for meals when taking out or packing:
Have you ever thought about whether the harmful substances in plastic will migrate to the food when using these hot and greasy meals, and then be eaten by us? Then do a test.
The country has standards for plastics used in food contact, which is GB 4806.7-2016 "Plastic Materials and Products for Food Contact", which stipulates the following physical and chemical indicators:
1 Total Migration
Plastics used in contact with food may have various harmful substances (mainly plasticizers, antioxidants, stabilizers, etc.) migrate into the food. This project is to soak with various food simulants, evaporate and dry the soaking liquid. , to obtain the total amount of non-volatile substances migrated from the sample to the soaking solution.
For plastic cups, the simulated solution we use is 10% ethanol, the temperature is 70 degrees (simulation of hot tea), and it is soaked for 2 hours.
For plastic bowls, we use 4% acetic acid (simulating acidic food) and 95% ethanol (simulating oily food). Temperature 70 degrees, soak for 2 hours.
2 consumption of potassium permanganate
The testing principle of potassium permanganate consumption is to soak the tested sample in distilled water, and all the easily dissolved organic small molecular substances will dissolve in the water to form a mixed solution. The mixed solution is titrated with a strong oxidizing potassium permanganate solution, and the organic small molecular substances will be completely oxidized, while water will not participate in the chemical reaction. The consumption of potassium permanganate indicates the content of soluble organic substances. .
3 Heavy metals
Plastics in contact with food may contain heavy metals, mainly from heat stabilizers, colorants or some inferior materials. This project detects the content of heavy metals in plastics.
Surprised to find that four very cheap samples have no problems at all.
For example, the result of a plastic cup:
The simulation liquid of the plastic bowl is different. The results of this part are as follows:
The total migration, potassium permanganate and heavy metals are all qualified.
It seems that we have been overly concerned before, at least in the ordinary use environment, the harmful substances of plastic will not migrate into the food. The materials of these samples we purchased are all PP (polypropylene), and from our test results, this material is indeed relatively safe.