Several instructions for the detection of food-grade transparent steel wire hose without plasticizer
The detection of plasticizers in general food-grade steel wire hoses needs to meet the national standard GB/21928-2008, but many people are not very familiar with the national standard. Here is a brief introduction to the detection of plasticizer-free hoses Several problems that are often encountered in.
1. The food-grade hose is tested after passing the test, and the conveying material is different, will the plasticizer exceed the standard? In the national standard GB/21928-2008, the plasticizer detection is to use meteorological chromatography to directly detect the raw material itself , It is not a test of the migration amount of the hose in the simulating fluid, so if it does not contain plasticizer or the plasticizer does not exceed the standard, no matter what the medium is, there will be no plasticizer exceeding the standard.
2. The food hose without plasticizer is detected to contain plasticizer. Is the hose qualified?
Many people think that the qualified hose plasticizer means that the hose does not contain or has no plasticizer detected. In fact, the national standard GB/21928-2008 clearly stipulates the content of plasticizer in polyurethane, as long as the plasticizer is plasticized If the content of the agent does not exceed the specified content, it is considered that the hose does not contain plasticizer or the plasticizer meets the standard.
3. There is a certification report for food-grade hoses, but after use, it is found that the plasticizer of the hose exceeds the standard? Is the hose reacting with the conveying medium, or the conveying medium itself contains plasticizer? Generally speaking, polyurethane does not Except for the reaction under special circumstances, it will generally not generate plasticizer with the conveying medium. At the same time, we do not allow customers to test the plasticizer again after the hose has been used for a period of time, so that the plasticizer cannot be distinguished fundamentally. Whether it is contained in the hose itself or in the conveying medium, we recommend that customers conduct a plasticizer test before use.